424 Mr. A. Adams on Mollusca from Japan. 



XLII. — On a new Genus of Terrestrial Mollusks from Japan. 

 By Arthur Adams, F.L.S. &c. 



[Plate VII. figs. 11, 12.] 

 Genus Blanfordia, A. Adams. 



Rostrum elongatum, transverse corrugatum, ad apicem emargina- 

 tum. Tentacula brevissima, triaiigularia, depressa, ad apicem acuta; 

 oculi sessiles ad basin superiorem tentaculorum ; pes magnus, sulco 

 transverse in partes duas divisus, ad latera utrinque lobatus, postice 

 lobo dorsali operculum gerente preeditus. 



Operculum corneum, subspirale. 



Testa ovato-conica, epidermide olivacea obtecta, apice truncate ; 

 anfractibus laevibus. 



Apertura elliptica; peristomate continuo, incrassato, duplicate, 

 interne subacute, externo subvaricoso. 



1. B.japonica, A. Adams, Sado, Japan. PI. VII. fig. 12. 



Tomichia, sp. Annals, Oct. 1861. 



2. B. Bensoni, A. Adams. Matsumai, Japan, PI. VII. fig. 11. 



Tomichia, sp. Annals, Oct. 1861. 



In Japan, at Matsumai and Sado, I discovered two species of 

 terrestrial Mollusks, with similar animals, which (in the ' Annals* 

 for October 1861) I referred to the genus Tomichia, Benson, a 

 form of TruncatelUdse from the Cape. Since then, I have sent 

 specimens of the shells, accompanied by drawings of the ani- 

 mals, to Mr. Benson ; and he assures me that his Tomichia are 

 very difi'erent. He writes to me as follows : — 



" A comparison of the animal of the Cape Tomichia with that 

 of your Japanese shells leads to the impression that your dis- 

 coveries belong to a distinct genus, which, but for the opercu- 

 lum, may rather be regarded as a land-shell, I have examined 

 a specimen, and find it horny and subspiral in construction, the 

 same as that of Tomichia, but more solid." 



In Tomichia the animal is similar to that of Truncatella, the 

 tentacles being filiform, and the eyes on tubercles, near the 

 upper bases of the tentacles. The foot is short, with anterior 

 lateral lobes, and with a simple operculigerous lobe. 



Mr. Benson found Tomichia at the Cape, in a freshwater 

 ditch communicating with a stream which discharges itself into 

 False Bay. "At Bazuarm^s Kraal, the adult specimens, for the 

 most part, crept about on the moist earth by the edge of the 

 water; but the younger individuals were immersed, in company 

 with a small soleniform Cypris. I observed that, aided by the 

 lightness of their shells, the young Tomichia were enabled to 

 swim I'esupinate at the surface." 



In Blanfordia the tentacles are short and triangular ; in To- 

 michia they are filiform : in Blanfordia the eyes are sessile on 



