1890.] M4RINE MOLLUSCA OF ST. HELENA. 293 



In the Cumingian Collection there is a single specimen of this 

 species and one of C. vicinum, which were received from Adams 

 himself. On examination they seem to me to belong to one and the 

 same species, the difference in thickness of the spiral and transverse 

 ridges being very slight. Some of the St. Helena examples exceed 

 the dimensions given by the author, having a length of 6 millimetres, 

 and they consist of ten normal and three nuclear whorls. The 

 slightly elevated spiral Hnc mentioned by Adams is at the top of the 

 whorls just below the suture, and the "fourth " spiral nodulous 

 slender ridge on the bodv-whorl should have been termed the 

 fifth. 



Cerithiovsis neglecta (C. B. Adams). 



Cerithiuin neglectum, C. B. Adams, Panama Shells, p. 164. 



Hub. Panama (Adams) ; Algiers {Sowerhy). 



This is a minute dark brown granulated shell, consisting of about 

 twelve whorls, of which the three or four apical are transparent, glossv, 

 smooth, and separated by a brown sutural line. Adams observes that 

 there are two additional spiral ridges on the lower part of the body- 

 whorl, whereas I distinctly count tliree, both in Panama and St. Helena 

 specimens. "With this exception, no fault can be found with his 

 diagnosis. Sowerby's figures (Thesaurus Conch, pi. 184. figs, 235, 

 236) either represent another species, as each whorl has but two 

 rows of granules, or else have been carelessly drawn. 



HipPONYX ANTiQUATUS (Linne). 



Hab. West Indies, Fernando Noronha, island of Trinidad in the 

 South Atlantic, and Ascension Island ; Loanda {Dunher). 



HippoNYx GRAYANUS, Mcnke. 



Hab. West coast of Central America, Sandwich Islands, Fernando 

 Noronha. 



I have given the distribution of this and the preceding species, 

 also references and synonymy, in my account of the Mollusca of 

 Fernando Noronha, which will be published in the Journal of the 

 Linnean Society. 



Teinostoma 1 ABNORME. (Plate XXIV. fig. 5.) 



Testa miiiuta, alba, penucicla, siibglobosa, imperforata ; anfrac- 

 tus 3, rapide accrescentes, sutiira canaliculata sejuncti ; 

 anfract. ttltiimis maguus, minute spiraliter striatus, in re^ione 

 umhilicali callo crasso instructus ; spira plana, hand elevata ; 

 apertura ma(jna, ovata, inferne e^'usa ; columella arcuata, 

 callo crasso refle.vo induta. 

 Longit. 1 millim., diam. max. 1. 



Although so minute, the above measurements probably represent 

 the adult size of this species. It does not agree with the typical 

 forms of Teinostoma in the shape of the aperture ; but in texture 

 and colour it is very similar. 



