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Show 606 MR. E. A. SMITH O N SHELLS [June 2, Reeve is the same species is confirmed by an examination of type in the British Museum. The specimens collected by Mr. Guppy are of a light olive-brown colour, and exhibit a fine reticulation and spotting with black from the violet apex to the middle of the last whorl. 56. NERITINA OLIVACEA, Le Guillou. Hab. Streams in Treasury Island, and in a stream at Sulagina, San Christoval. The specimens from the above locality differ from those collected by Cuming at the Philippine Islands in being rather smaller and in having the collumelar callus of a reddish tint except along the toothed edge, which is white. Some of the specimens exhibit a considerable amount of fine spotting and reticulating lines. With this species I would unite N. solium, Recluz ; and perhaps the four following species, N. bicolor, Recluz, N. subpunctata, Recluz, N. interrupta, Recluz, and N. souleyetana, are merely varieties of the same species. 57. NERITINA MACGILLIVRAYI, Reeve. Hab. Streams in Faro Island (Guppy) ; streams in Guadalcanar Island (Macyillivray, in Brit. Mus.) ; and Ngau, Fiji group (Brit. Mus.). The Fijian specimens are considerably larger than the type figured by Reeve, having an extreme diameter of 42 millims. All the specimens of this species which I have seen have the apex considerably eroded. The specimens obtained by Mr. Guppy are of small size, and may be adult shells, although having a maximum diameter of only 16 millims. 58. NERITINA ASPERULATA, Recluz. Hab. Ugi Island, " living on the sides of a deep ravine worn by a stream in a soft calcareous rock " (Guppy). This species has not been previously recorded from these islands. The specimens are smaller than those obtained by Mr. Cuming at the island of Luzon, but may not be adult; the columella is of a uniform pale ochre tint. The operculum is almost precisely the same as that of N. sanguinea which I have described, but has a broader corneous border. 59. NERITINA PORCATA, Gould. Hab. In streams, Faro Island (Guppy); San Christoval, Solomon group, Fiji and Navigators Islands (Brit. Mus.). Neritina sanyuinea, Sowerby, is very like this species in many respects, but is smoother, being without the distinct ridges so characteristic of N. porcata. 60. NERITINA VARIEGATA, Lesson. Hab. Faro, Simbo, San Christoval, and Ugi Islands, and Choiseul Bay. |