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Show 1883. THE 'TRITON' EXPEDITION. 393 4. Leda lucida, Lov. 5. Area pectunculdides, Sc.; var. septentrionalis. 6. Nucula tumidula, Malm. 7. Dacrydiurn vitreum, Tor. 8. Dentalium striolatum, Stimpson. 9. Puncturella noachina, L. 10. Ganesa nitidiuscula, Jeffr. 11. Trochus ottoi, Ph. 12. Cithna tenella, Jeffr. 13. Aporrhais serresianus, Mich. 14. Natica grcenlandica, Beck ; var. contractu. 15. Natica montacuti, Forb. 16. Trophon carinatus, Jeffr., sp. n. 17- Fusus berniciensis, King. 18. Columbeila haliceeti, Jeffr. 19. Defrancia formosa, Jeffr., sp. n. 20. Pleurotoma exigua, Jeffr., sp. n. 21. Cylichna alba, Brown. 22. Cylichna ovata, Jeffr., = 1 conuloides, S. V. Wood. 23. Cryptaxis crebripunctatus, Jeffr., n. sp. 24. Scaphander puncto-striatus, Mighels and Adams. All except No. 21 and the new species have an extensive range in the North Atlantic. The species of Mollusca procured during the cruise of the ' Triton were 62. For the geographical distribution, synonymy, and other remarks with respect to the above-named species, I would refer to m y work on 'British Conchology,' m y " Report of the 'Valorous' Expedition " and account of the Mollusca in the ' Proceedings' of the Royal Society for 1876 and the 'Annals and Magazine of Natural History' for 1876 and 1877, and to m y papers on the Mollusca from the ' Lightning' and 'Porcupine' Expeditions in the 'Proceedings' of the Zoological Society for 1878, 1879, 1881, 1882, and 1883, as well as in other publications. Descriptions and figures of some of the species, particularly those which are new to science, are subjoined. 1. COCCULINA SPINIGERA1, Jeffreys. (Plate XLIV. figs. 1, 1 a, 1 b, 1 c.) S H E L L oval, convex, rather thin, semitransparent, somewhat glossy, especially on the upper part, where the spines have disappeared : sculpture, extremely numerous and delicate stria? which radiate towards the margin ; these striae are crested by rows of minute tubercles, each of which supports a fine short hair-like spine or prickle; the spines are easily removed, and disappear when the shell is subjected to the action of potash-water, showing that they are of a chitinous nature; the apex is quite smooth : colour white : beak very small, incurved and twisted downwards, forming a single whorl; it is persistent, but sometimes broken or injured by attrition; its 1 Prickly. |