214 PROCEEDINGS OF THE ACADEMY OF [1892. 



Cysticopsis tenerrima C. B. Adams. (PI. XIII, fig. P.) 



The single siDeciinen which furnished the following details was 

 taken by Mr. C. W. Johnson at Port Antonio, Jamaica, in April, 

 1891. 



The animal is black externally. The foot is short; sole indis- 

 tinctly tripartite. 



The genitalia (PI. XIII, fig. F.) are more like Sagda than any other 

 form as yet known, and the group must evidently be removed from 

 the vicinity of Hemltrochus, Avhere it has hitherto been placed. The 

 female system has the uterus enormously distended with young, which 

 were twenty-seven in number in the specimen examined. The young 

 shells are globular, consisting of two whorls ; when dry they are 

 very iridescent. Those in the upper part are less developed than 

 the lower ones, and a single ovum, enclosed in a very thin, brittle 

 white shell, was found. The sperm atheca (sp.) has a long, bifurcat- 

 ing duct, closely bound to the oviduct, its extreme upper portion 

 only being free. The penis sac (^.) is long, the vas deferens inserted 

 near its summit. It terminates in two flagellate organs (^.) the 

 smaller being short and sickle-shaped. At the lower fourth of the 

 penis-sac arises an organ comparable to the accessory organ in 

 Sagda shnilis. This organ terminates in two long flagella (x. x.) 

 Aegista platyomphala Mlldff. (PI. XIII, figs. G. H.) 



A specimen containing the dried animal furnished the jaw and 

 lingual membrane. The jaw (PI. XIII, fig. H.) is rather strong, 

 slightly arcuate, and furnished with five or six wide unequal ribs. 

 These, with the exception of the one nearest the center, are low 

 and not strongly defined. The cutting edge is weakly denticulated 

 by the ribs. The superior-lateral portions of the jaw are thin. 



The radula (PI. XIII, fig. G.) is short and broad, consisting of 33- 

 1-33 teeth. The rhachidian tooth (r.) and the inner ten laterals 

 lack side cusps. The eleventh lateral develops a side cusp. There 

 are fifteen or sixteen time lateral teeth. The inner marginal teeth 

 become tricuspid by the bifurcation of the principal cusp ; the outer 

 marginals are quadricuspid, the side cusp also bifurcating. 



The shell furnishing these preparations is Xo. 60,443 of the 

 Academy collection. Collected by Mr. B. Schmacker. Locality, 

 Kwangtung(Guangdung), China. 



Caracolus (Dentellaria) orbiculata Ft-r. (PI. XIII, fig. T. J.) 



The specimens were collected in Martinique by I'Abbe Vathelet, 

 and transmitted to me by post, alive. 



