606 MR. E. A. SMITH ON SHELLS [June 2, 



Reeve is the same species is confirmed by an examination of the 

 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 PhiUppine Islands in being rather smaller and 

 in having the coUuraelar 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. hicolor, Recluz, N. suhpmictata, 

 Recluz, N. interrupta, Recluz, and N. souleyctana, are merely 

 varieties of the same species. 



57. Neritina macgillivrayi, Reeve. 



Hab. Streams in Faro Island (Guppy) ; streams in Guadalcanar 

 Island {Macgillivray, in Brit. Mus.) ; and Ngau, Fiji group {Brit. 



Mus.). 



The Fijian specimens are considerably larger than the type 

 fio-ured by Reeve, having an extreme diameter of 42 millims. AH 

 the specimens of this species which I have seen have the apex con- 

 siderably eroded. The specimens obtained by Mr. Guppy are of 

 small size, and may be adult shells, although having a maximum 

 diameter of only 16 milUnis. 



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, Sulomon 

 o-roup, Fiji and Navigators Islands {Brit. Mus.). 



Neritina sanguinea, Sowerby, is very Hke 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. 



