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Show 810 MR. E. A. SMITH ON MARINE SHELLS [NOV. 5, Besides the two or three "plaits," which perhaps should rather be termed elongate tubercles, at the base of the columella, there is a small one at the upper part, usually present in most species of Nassa. N. trinodosa of Smith has the same nodulation on the last whorl, but, however, is quite distinct from this species. It differs in colour, has fewer longitudinal costse, which are less granulous ; and the spiral thread-like lirae which cross them are fewer and less prominent. Ar. subspinosa of Lamarck is another allied species of much the same form, and having the same character of sculpture; only the nodules are much more prominent and the ribs less numerous. 27. NASSA (ARCULARIA) GRANIFERA, Kiener, Coq. Viv. pl. 27. fig. Ill ; Reeve, Conch. Ic. viii. fig. 72. Hab. Philippines (Beeve). 28. NASSA (ARCULARIA) BIMACULOSA, A. Ad. P.Z.S. 1851, p. 102; Reeve, Conch. Icon. viii. sp. 61. Hab. Philippines (Cuming) ; "Andaman Islands, on sand banks at low tide ; very active animal" (Wilmer). 29. NASSA (ARCULARIA) CALLOSPIRA, A. Ad. P.Z.S. 1851, p. 102 ; Reeve, Conch. Icon. viii. figs. 66 a, b ; G. and H. Nevill, Journ. Asiatic Soc. Bengal, 1874, vol. xliii. pt. 2, pl. figs. 5, 5 a. Hab. Andaman Islands (Nevill and Wilmsr) ; Philippines (Cuming). On comparing an Andaman specimen with the type of the species, I do not hesitate for a moment with regard to its identity. 30. NASSA HORRIDA Dunker. Buccinum horridum, Dkr., Philippi's Abbild. ueuer Conch, iii. pl. 2. fig. 8. Nassa horrida, Dkr., Reeve, Conch. Icon. viii. figs. 69 a, b. N. curta, Gould, Otia, p. 69 ; Atlas, Wilkes's Explor. Exped. pl. 19. figs. 326 a, b. Hab. Samoa Islands (Gould). 31. NASSA ECHINATA, A. Adams, P. Z. S. 1851, p. 101 ; Reeve, Conch. Icon. viii. fig. 131. (Plate L. fig. 9.) Hab. Philippines. The Andaman specimens are all shorter than the type, which is figured by Reeve ; and not one of them has the fifth or lowermost series of nodules on the body-whorl, which is very closely approximated to the fourth row. In other respects they agree perfectly with the typical shells said to have been found at the Philippine Islands. This species is allied to N. muricata of Quoy and Gaimard, yet is perfectly distinct. It differs from that species in being almost quite smooth in the interstices between the nodules, there being only the faintest indication of spiral striae in some specimens. The aperture, too, is less elongate, and the margin of the basal canal is stained with dark brown. This |