— 417 - 



C. margarita, Rve. My séries shows that tliis is very 

 closely related to C. olblna, Kien., and it may even be 

 conspecific with this ; it however appears to be a definite 

 local form. 



Group of C. Marquesa 



Together with C. Marquesa, Gask. and C. sublaevis, 

 Montr. Hervier bas included in this group several forms 

 which in my opinion would be belter considered apart ; 

 while,on the other hand,he places C.jaspidea, Sby. and rela- 

 ted forms in a separate group, when it is practically certain 

 that C. Marquesa, if not indeed but a variety of C. jaspidea, 

 is at least very closely related to the latter. Once more the 

 want of suitable material precludes any really scientifîc 

 treatment of the group : it appears to contain numerous 

 local forms together with several others whose characters 

 are probably dépendent upon environment. 



Group of C. nympha. 



This group is represented in the IndoPacific région by 

 numerous local forms which, while subject to enormous 

 individual variation, resemble each other so closely that 

 their varieties appear to overlap ; and, it is useless to 

 speculate upon the limits of the so-called species until 

 more carefuUy collected material from numerous localities 

 is available. The shells examined by M. Hervier, being ail 

 beach-worn, were not in sufficiently good state for 

 exact détermination ; and, in many cases the types of the 

 species to which he has referred them, being unlocalised 

 or in worn condition, are themselves not recognisable 

 with certainly. The distinction between certain members 

 of this group and of that of C. conspersa appears to be 

 but a very slight one. 



C. mindoroensis, Rve. (?) I hâve never seen any speci- 



