MACROCHLAMYS. 93 



The penis is quite different from that of sequax ; the ccecum, 

 instead of being closely coiled, is free, similar in size and length 

 to the kale-sac; the epiphallus is very short, and just below 

 the retractor muscle there is a globose enlargement of the 

 penis-tube. The amatorial organ is long. In the free caecum 

 the male organ may be compared to the similar character found in 

 M. richilaensis. 



This species was also obtained in the Risetchu Valley, and is 

 represented by eight specimens, some of which are rather flatter 

 in the spire than the type. Three specimens are from Rissom 

 Peak.] 



[135. Macrochlamys zemoensis, Godwin-Austen, Mol 2nd.u,p. 164, 

 1907, pi. 100, figs. 1- 16 (shell, animal, and anatomy). 



Shell globosely conoid, glassy, fragile, narrowly umbilicated ; 

 sculpture quite smooth ; whorls trans versety crossed by wavy 

 furrows of growth, here and there traces of longitudinal stria3 

 under high power ; colour ochraceous with an olive tint, some 

 more sienna- brown than others ; spire rather depressed, apex 

 rounded ; suture moderately impressed. Whorls 5, regularly in- 

 creasing; aperture broadly lunate ; peristome very thin ; coluinellar 

 margin weak, scarcely reflected. 



Size : maj. diam. 10*0, min. 9'0 ; alt. axis 4*5 mm. 



Locality. Zerao Samdong, Sikhim, valley of the Lachen, about 

 12,000 feet. In the pine-forests. 



Animal with a dark-coloured broad margin to the foot, pale on 

 the keel of same, the pallial friuge broad; the lobe over the 

 mucous gland long and pointed ; sole of foot well divided. The 

 right shell-lobe is large, rather broad at base. There is a small 

 narrow left shell-lobe and the left dorsal lobe is in two separate 

 parts. The visceral sac is sparsely spotted near the suture, with 

 a black band bordering the mantle-zone, and a long black band 

 runs parallel to the renal organ. The salivary glands are in one 

 compact mass. 



Oenitalia. The penis-muscle is attached to a coiled free ccecum, as 

 I have noticed in M. richilaensis ; there is a short flagellum where 

 the vas deferens joins. The amatorial organ is moderately long 

 and straight. 



The jaw has a central projection. 



The radula formula is 



35 . 1 . 9 . 1 . 9 . 1 . 35 to 40 

 45 . 1 . 45 



The centre tooth is tricuspid ; the admedian teeth have a very small 

 inner cusp high up on inside and a larger one lower down on the 

 outside ; the marginal teeth are bicuspid, the outer cusp below the 

 main one.] 



