126 PROCEEDINGS OF THE ACADEMY OF [1887. 



Not uncommon beneath decaying vegetation. It is also found in 

 the Tonga, Viti, Cook's and Marquesas Islands. 



It may be determined by its small size (3 mill, in diam.), perfor- 

 ated base, depressed turbinate form, reddish or brownish horn color, 



5 strongly convex whorls and angulated periphery. 



T. microconus, Mousson. 



Nanina microconus, Mousson, Jour, de Conch., 1865, p. 192. 

 (Thalassia) Paetel, Cat. Conch., p. 85. 



Helix microconus, Pfeiffer, Mon. Hel., v, p. 94. 



Zonites (Comdus) microconus, Mousson, Jour, de Conch., 1870., p. 

 117. Paetel, Cat. Conch., p. 86. Schmeltz, Cat. Mus. Godeff, p. 



90. 



Helix Pinnocki, Liardet, Proc. Zool. Soc, 1876, p. 100, pi. 5, figs. 



5, 5a. 



This, like the preceding species, lives beneath decaying vegeta- 

 tion and is also found in the Viti and Tonga Islands. 



A minute, perforated, conical, grayish horn-colored species with 

 5* spirally striated whorls, the last one acutely angulated and the 

 base smooth. 

 T. Schmeltziana, Mousson. 



Nanina Schmeltziana, Mousson, Jour, de Conch., 1865, p, 167. 1869. 

 {Trochonanina), p. 329, pi. 14, fig. 4. Schmeltz, Cat. Mus. Godefl"., 

 v, p. 91. (Thalassa) Paetel, Cat. Conch., p. 85. 



Helix Schmeltziana, Pfeiffer, Mon. Hel., v, p. 58. 



Trocliomorpha Schmeltziana, Pease, Proc. Zool. Soc, 1871, p. 474. 



I found two examples of this delicate species on the foliage of 

 shrubs on the low lands near the sea-shore at Upolu. 



Its most essential characters are its thin delicate texture, smooth 

 imperforated base, depressed conical form, luteous-horn color, mar- 

 gined suture, 52 slightly convex whorls, the last one acutely and 

 compressly carinated. The upper whorls are spirally striated, the 

 striae scarcely visible withovit the aid of a lens. Diam. 9, height 



6 mill. 



Mousson (in Jour, de Conch., 1869, p. 30) describes a var. usur- 

 pata which is more elevately conical and the keel not so acute. It 

 inhabits Savaii and is probably a distinct species. 



TROCHOMOEPHA, Albers. 

 T. Troilus, Gould. 



Helix (Carocolla) Troilus, Gould, Proc. Bost. Soc. Nat. Hist., 



