1871.] F. Stoliczka — Notes on Terrestrial Mollusca. 227 



The two last items in the table, giving the relative proportions 

 of the most important characters npon which the growth of the shell 

 depends, clearly shew the identity of the species. Two forms geo- 

 graphically most distant, from Moulinein and Darjeeling, very 

 closely correspond with each other. The limits of variation in the 

 proportions between the smaller and the larger diameters are 

 0-75 and 0*82, and those of the height to width of the aperture 

 0'74 to 0*94, the difference being chiefly due to the greater or lesser 

 expansion of the peristome. 



The animal of the Moulmein variety is fleshy grey, anteriorly 

 much longer than posteriorly ; foot depressed, finely granulated 

 like the rest of the body, without a lateral line ; pedicles long, 

 tentacles moderate, both of a darker grey colour ; a pale strip 

 runs from between the pedicles along the centre of the back 

 and gradually disappears posteriorly. 



The mantle is entire at its edge and very slightly thickened, 

 internally spotted with dusky brown ; the left dorsal lobe is only 

 represented by a simple thickening, the right reaches anteriorly 

 over the back and becomes rapidly narrower below. The mouth 

 is short, thick, as in other Helicid^e ; the salivary glands very 

 large, enveloping the whole of the anterior part of the ali- 

 mentary canal. The intestines are of considerable length, making 

 one shorter and one longer twist. Other parts of the digestive and 

 secretionary systems do not differ from those of other Helicice ; 

 but the genital organs are peculiar. The uterus is thin and long ; 

 the seminal receptacle almost equal to it in length, and only moder- 

 ately thickened towards its obtuse end. No glands at the ante- 

 rior end of the uterus, nor an appendage on the recept. seminis ; 

 neither was an arrow gland observed. The penis is, however, very 

 long, twisted, with a small coecum (? flagellum) at the point 

 where the vas deferens enters ; the last thickened part is sus- 

 pended by a special retractile muscle. 



The jaw is moderately narrow, semilunar, ribbed on the entire 

 surface, the 7 median ribs being stronger than those following 

 at the sides. 



The radula is of very great length. I counted 124 transverse, 







