266 PEOCEEDINGS OF THE MALICOLOGICAL SOCIETY. 



The genitalia (Fig. Y) are novs^ sTiown to be typical of Pleurodonte, 

 in that the female system is simple and by the presence of an epiphallus 

 and a flagellum, but the retractor muscle is seated on the epiphallus 

 instead of upon the penis, in this character agreeing with the Asiatic 

 and Australian rather than with the American forms. The male 

 organs, in particular, resemble those of Chlorites Porteri ^ more nearly 

 than they do Pleurodonte^ thus emphasizing Pilsbry's remarks^ as to 

 the affinities of this latter genus and its distribution. 



The radula has unicuspid central and lateral teeth (Fig. YI), the 

 mesocones being very largely developed. Some of the marginals may 

 be described in the words which Pilsbry applies to those of Chlorites^ 

 when he says^ that the latter have "a large bifid mesocone and an 

 ectocone," but the outermost are very rudimentary. The jaw 

 (Fig. YII) is longitudinally striated. 



1 T.c, pi. xxTiii, fig. 1. 2 T.c, p. 86. ^ t.c, p. 119. 



