On new Species of Histeridae. 417 ■with others in my collection from Greenland ; the number of spokes in the Finmark specimens ranges from sixteen to twenty-one. Genus Trochoderma, Theel. Trochoderma elegans, Theel. 1877. Trochoderma elegans, Theel, " Quelques Holothuries des Mers de la Nouvelle Zemble," Nov. Acta Reg. Soc. Sc. Upsala, ser. iii. p. 11 (separate copy), pi. ii. This genus, like the last, is furnished with wheel-like spicules, but the tyre is rounded and. armed with spines instead of furnished with triangular inward-directed processes, as in Myriotrochus. Ostergren writes : — " I have now before me a specimen of this species which is new to the Norwegian fauna ; it was obtained by G. O. Sars at Mortensnes, in the Varanger Fiord " (" Holothuroidea of Northern Norway," Bergens Mus. Aarbog, 1902, p. 21). EXPLANATION OF PLATE XXVII. Fig. 1. Fupyrgus scaler, Liitken, magnified ; the actual length indicated by the line below. Fig. 2. The same. Spicules as seen from above. Fig. 3. The same. Spicules as seen from the side. Fig. 4. Chirodota Icevis, Fabricius. A spicule. Fig. 5. Myriotrochus Rinkii, Steenstrup. Wheel-spicule in early stage of development. Fig. 6. The same. Wheel-spicule seen from above. Fig. 7. The same. Wheel-spicule seen from below. Fig. 8. The same. Wheel-spicule seen obliquely. Fig. 9. The same. Wheel-spicule seen from the side. XL. — On new Species o/Histeridge and Notices of others. By G. Lewis, F.L.S. This is the twenty-second paper on the Histeridse published in this Magazine, and the last before the issue of a new catalogue of the species belonging to the Family. In these papers about 418 species have been described. The Munich Catalogue of 1868 recorded 1151 species, but this number is reduced to about 1050 by the names that fall into synonymy. About 2316 species are known at present^ and of these 1727 are represented in my collection; 6ol of these are authors' types, 296 species are represented by
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