1871.] F. Stoliczka — NoUi on Terrestrial Molluscct. 235 



end, and internally provided with a strong, pointed papilla. This 

 is composed of three entirely different layers of mnscular tissue '. 

 the outer one consists of tough longitudinal muscles, the next 

 is a thick layer of transverse muscles, and then follows a soft 

 tissue in which longitudinal muscles prevail ; the inner cavity is in 

 its entire length filled with an extremely fine granular substance, 

 the granules being opaque and nearly equal in size. The herma- 

 phrodite organ begins as a simple tube, the seminal receptacle 

 branching off some distance from the opening, its end lies imbedded 

 in soft tissue at the anterior part of the uterus. "Where the seminal 

 receptacle branches off the prostata possesses a small, dark, sessile, 

 muscular appendage {fa). The inside of this resembled (in spirit 

 specimens) a soft mass of fine reticulated threads, like spermatozoa. 

 The vas deferens has about the middle along appendage (/?.) which 

 enclosed a very thin, elastic or spongy flagellum ;* after this the 

 duct thickens into a gland, filled with white, ovately lenticular, 

 calcareous particles, having the appearance of a milky substance, 

 when that gland is cut upon. A short distance from the calciferous 

 gland follows again a coecal appendage, attached by a few muscular 

 threads to the inner side of the mantle ; the terminal portion of the 

 duct represents the true penis, it is somewhat bent and thickened 

 near the middle, but it does not enclose a specially developed 

 papilla for purposes of copulation. 



One young specimen which I examined did not appear to 

 have the amatorial sac developed, at least I was not able to 

 trace it. The uterus was very thin ; the receptaculum seminis re- 

 presented by only a very thin tube, twisted round the anterior part 

 of the former. The vas deferens had a small flagellar appendage 

 (#.), but the flagellum itself could not be traced, and there were no 

 calcareous bodies developed in the small enlargement of the duct 

 next to the flagellar appendage. 



The jaw (fig. 4) is rather narrowly semilunar, smooth, very 

 slightly prominent at the median part of the concave front edge. 

 In transparent light there is on it a very fine, somewhat irregular 

 concentric striation perceptible, particularly near the front edge. 



* This flagellum is entirely distinct from the sac with calcareous bodies, 

 and appears %o have the object of assisting the passage of the spermatozoa 

 through the calcareous mass which fills the enlargement next to it. 



