6oo 



Records of the Indian Museum. [Vol. XXII, 



tral surface of the foot is white. The dorsal surface of the bodj' 

 is speckled with black blotches, which are absent on the left side. 

 The dorsal wall of the pulmonary chamber is thin and transparent 

 and the cavity itself is large. The edge of the mantle thins down 

 on the side of the body and lies on it as a thin flap-like membrane. 

 This may be a useful adaptation for the storage of moisture. 



The reproductive organs are interesting in many respects, and 

 belong essentially to a different t^'pe from those of the other spe- 

 cies examined. 



The prostate as a whole appears to be sub-elliptical and to 

 have an oblique cleft across its dorsal surface. This is due to the 



fact that the gland is twisted spirally 

 round the vas deferens which issues 

 from the cleft and, proceeding for- 

 wards as a stout, straight tube be- 

 comes swollen distally to form the 

 penis. The penis when retracted lies 

 obliquel}' in a thin-walled sac. It is 

 a short muscular organ, sub- triangular 

 in longitudinal section. Its lumen is 

 narrow but swells up in the middle and 

 again continues its course as a narrow 

 tube, so that a cross-like appearance is 

 produced. The penis has a thin mus- 

 cular sheath but there is no retractor 

 muscle. It opens into the shallow slit 

 on the right side of the body common 

 to it, the duct of the receptaculum 

 seminis and the female duct. 



The female organs are also some- 

 what peculiar. The uterus is much coiled and at its distal end 

 becomes constricted and narrow. The receptaculum seminis has 

 a long stout duct, as thick as the terminal portion of the uterus. 

 The pores of the ducts of the male and female organs and of 



Fig. 26. — Penis of Succiiicn 

 semiserica, Gould. 



cu 



Fig. 27.- — Siituiiien semisericii, Gould. 

 lal Jaw. fh) Radular teeth. 



