PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON lll(4):883-888. 1998. A new genus and species of ghost shrimp (Crustacea: Decapoda: Callianassidae) from the Atlantic Ocean Richard W. Heard and Raymond B. Manning (RWH) Invertebrate Zoology Section, Gulf Coast Research Laboratory, Ocean Springs, Mississippi 39564, U.S.A.; (RBM) Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560-0163, U.S.A. Abstract. — Necallianassa berylae, new genus and species, are named from material taken at several locations off the coasts of Georgia and South Carolina in depths ranging from 35 to 75 m. Two eastern Atlantic species, Callianassa acanthura Caroli, 1946, and C truncata Giard & Bonnier, 1890, are transferred to Necallianassa. Members of this new genus can be distinguished from other members of the Callianassinae by the presence of a lateral spine on the uro-podal endopod and one or two lateral spines on the telson. An undescribed species of callianassid was found by one of us (R.W.H.) in collec-tions made during ecological and baseline studies conducted off the coasts of Georgia and South Carolina. Nearly all of the spec-imens are broken, and many are fragmen-tary with legs detached or missing. The ho-lotype and a series of paratypes have been deposited in the National Museum of Nat-ural History, Washington (USNM). Addi-tional paratypes have been deposited in the Museum of the Gulf Coast Research Lab-oratory, Ocean Springs (GCRL). The specimens from Georgia were col-lected by M. B. Gray, Sapelo Island Re-search Foundation (SRF). The specimens from South Carolina were collected by Tex-as Instruments South Atlantic Benchmark Program for the Minerals Management Ser-vice, U.S. Department of the Interior (TI/ MMS). Abbreviations used in the accounts below include: Al, antennule; A2, antenna; cl, postorbital carapace length; ft, feet; leg., collector or collected by; m, meters; Man, mandible; Max 1-2, first and second max-illae; mm, millimeters; Mxpl-3, first to third maxillipeds; PI -5, first to fifth pereo-pods (PI is the cheliped, P5 the fourth walking leg); Pip 1-5, first to fifth pleopods; tl, total length. Callianassidae Dana, 1852 Callianassinae Dana, 1852 Necallianassa, new genus Type species. — Necallianassa berylae, new species, by present designation. Included species. — The type species, from the western Atlantic, and two other species from the eastern Atlantic: Necalli-anassa truncata (Giard & Bonnier, 1890), new combination; and Necallianassa acan-thura (Caroli, 1946), new combination. Diagnosis. — Size very small to medium, total lengths of adults 15 mm or less to about 50 mm. Carapace with dorsal oval and rostral projection or spine, lacking car-diac prominence and rostral carina. Rostral spine, when present, extending to or beyond cornea. Cornea subterminal, dorsal, small, disc-shaped. Al peduncle similar to A2 pe-duncle in size and length. Mxp3 suboper-culiform, length of ischium and merus sim-ilar to or less than twice width, without ex-opod; merus not projecting beyond
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