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On a collection of fishes from Paraguay, with a synopsis of the American genera of cichlids

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1903, in volume 55, pages 497-537

A revision of the North American ants of the genus Leptothorax Mayr

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 215-260

A list of Arachnida from Hayti; with descriptions of new species

Published in Proc. Acad. nat. Sci. Philad., in 1903, in volume 55, pages 340-345

Myriapods from Beulah, New Mexico

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 35-40

A New Genus of Stenopelmatinae (Orthoptera) from New Mexico

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1903, in volume 55, pages 630-631

Supplementary notes on spiders of the genera Lycosa, Pardosa, Pirata, and Dolomedes from the northeastern United States

Published in Proc. Acad. nat. Sci. Philad., in 1903, in volume 55, pages 645-655

Polychaeta from the coastal slope of Japan and from Kamchatka and Bering Sea

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 401-490

Descriptions of two new species of Polychaeta from Woods Hole, Mass

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 720-726

Studies in Old World Mantidae (Orthoptera)

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 701-718

A Note on the Common Bottlenosed Porpoise of the North Atlantic, Tursiops truncatus (Montagu)

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 313-314

A Collection of Reptiles and Batrachians from Arkansas, Indian Territory and Western Texas

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 538-542

A New American Genus of Arionidæ

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 626-629

Inclusions in Quartz

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 700

Texas Reptiles and Their Faunal Relations

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 543-558

Life Colors of Pœcilia limantouri, and Description of a New Heros from Mexico

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 320-323

Additions to the Japanese Land Snail Fauna: No. VIII

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 315-319

Report of the Curators

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 808-810

A New Hawaiian Limnæa

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 790-791

Some Pelagic Polychæta New to the Woods Hole Fauna

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 793-801

December 15

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 792

November 17

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 753

Additions to the Museum

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 821-829

A List of Shells Collected in Western Florida and Horn Island, Mississippi

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 756-759

Nosema geophili, sp. n., a Myxosporidian Parasite of Geophilus

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 337-338

The Variations of Eutænia in the Pacific Subregion

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 286-297

History of the Caribbean Islands from a Petrographic Point of View (Abstract)

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 396-400

Supplementary Notes on an Ant

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 491-495

New Lithobii from California and Oregon

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 152-160

March 24

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 285

April 14

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 324

Studies in American Forficulidæ

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 299-312

October 6

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 625

Variation in the Snail-Genus Ashmunella

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 615-616

The Mutation of Hibiscus moscheutos L

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1903, in volume 55, pages 326-327