424 Lt.-Col. IT. II. Godwin-Austen on 



The animal from which this radula was extracted was said 

 to come from the foot of the Himalayas. I must point out 

 here that an error in determination was made. It cannot be 

 that of N. cahas, which is a Sophina and type of that genus 

 of Benson only found in Tenasserim. It has a radula of a 

 very peculiar and aberrant type {vide l Land and Freshwater 

 Mollusca of India/ ii. p. 221, pi. cxv. figs. 5, 5 a, and pi. cxvi. 

 fig. 3). The radula figured is that of a Macrochlamys, but 

 unfortunately the species cannot now be determined. The 

 description of the foot applies well to this Indian genus. 



Genus Erepta, Albers. 

 Erepta, Albers, Die Heliceen, 1850, p. 109. 



Original description : — " Testa imperforata, depressiuscula, 

 solidula; anfractus 6, ultimus subangulatus; apcrtura lunaris, 

 columella breviSj obliqua, dente valido truncata, peristoma 

 simpl x, margine basali subincrassato." 



Type Helix stylodon, Pfr., Isle de France. 



The animal of this species I have not as yet be n able to 

 obtain. 



Genus Pachystyla, Morch. 

 Pachystyla, Morch, Cat. Yoldi, 1862. 



Type inversicolor , Fer. No description. 



I have not yet seen tlie animal of this species, but from 

 the description of the genitalia given above by Messrs. Bland 

 and Binney it appears to be of the type of those described 

 in this paper. 



In 1858 H. & A. Adams, in their ' Genera of Recent 

 Mollusca/ p. 224, adopted Pachystyl i, but neglecting in- 

 versicolor, take two other .Mauritian shells as typical examples, 

 viz. mauritiana and ochroleuca, Ferus., which in shell- 

 character are very unlike the Albers type. Erepta is made 

 a subgenus of Stylodontt, p. 187. 



In the 1860 edition of ' Die Heliceen/ Eduard von Martens 

 included in Erepta the species stylodon, Pfr. (original type), 

 mauritiana, Pfr., barclayi, Bs. (belonging to a different genus), 

 odontina, Morelet, mauritianella, Morelet, Ughtfooti, Pfr., 

 and suffidta, Bs. ; the last two are the same as odontina, and 

 mauritianella is the same as 'mauritiana. 



Paul Fischer, Man. de Conchyliologie, 1887, p. 461, adopts 

 Pachystyla as a section of Ariophanta, with subgenera Coelatura 

 and Rotula ; these differ very widely from any species of the 

 Ariophantinse and cannot be retained in it. 



In this paper I select Erepta to represent these Mauritian 



