238 F. Stoliczka— JVofotf on Terrestrial Mollusca. [No. 3, 



lobe -being slightly reflected over the edge of the outer lip, so as 

 just to cover it. The right dorsal lobe is much larger than the 

 left, which is represented by a mere thickened rim. 



The general anatomy of the digestive and nervous organs and 

 of the muscular system is exactly as in Rotula. The generative 

 organs have a large and long uterus ; the terminal swollen end 

 of the seminal receptacle is inbedded in a soft tissue at the anterior 

 end of the prostata; vas deferens short and extremely thin, 

 widened before it enters the penis, the expanded portion being 

 filled with a granular colouring pigment, in which, however, no 

 calcareous particles were discernible. The penis is rather thick, pos- 

 teriorly prolonged and attached by a thin muscle to near the end 

 of the prostata. The amatorial gland is a very strong, tough, 

 twisted tube, enclosing a pointed flagellum. A section of the 

 median portion of the gland (see \a on pi. xviii,) shews an ex- 

 ternal thick layer of longitudinal muscles, (a) then follows a 

 layer of transverse muscles (/?), and after this a thinner, but very 

 tough layer (y), enclosing a hollow space (8), which in spirit 

 specimens was filled with a jelly-like substance, mixed with harder 

 flattened bodies of an irregular shape. 



The jaw is semicircular, slightly projecting in the centre of the 

 concave edge, smooth, about the median part indistinctly and very 

 finely concentrically striated ; the posterior part, along the convex 

 edge and some distance from it, is not perfectly solidified. 



The radula is very large, consisting of about 100, nearly 

 straight or slightly undulating transverse rows. In a full grown 

 specimen I counted 405 teeth in each row, the formula being 

 200 + 2 — 1 — 2 -f 200, and the total number of teeth about 

 40,000. The four median teeth are conspicuously larger, than those 

 following on either side, all have a sharp pointed cusp at the anterior 

 end. The centre tooth has besides two smaller cusps at each side 

 and is symmetrical ; the following are gradually more and more 

 turned on either the right or left side, and the smaller cusps are, 

 therefore, developed only on one side ; the last lateral tooth is 

 styliform. 



The shell of Conulema attegia is subject to a large amount 

 of variation. The original specimen described from Tenasserim 



