82 ZONITID^E. 



oblique, broadly lunate, with rather broad white labiation inside ; 

 peristome in one plane, acute, columellar margin curved, slightly 

 expanded, briefly reflected above. 



Fig. 40. Macrochlamys tugurium. 



Maj. diara. 21|, min. 18J, height 12 mm. 

 Hob. Sikhim, not rare about )arjiling, 4000'-7000'. 

 [The first two or three whorls of the shell show hardly any 

 sculpture, thence a very finely decussate surface gradually follows, 

 becoming strong towards the aperture : under a high power the 

 cross-striation produces a close series of papillate dots. 



Description of the animal. A specimen from Eissom Peak in the 

 Daling District, east of the Teesta, which prior to 1864 formed 

 part of the Bhutan State (4600 feet), is as follows : Ochre 

 throughout, the pedal margin very wide, sole of foot divided into 

 three equal areas, a very large overhanging lobe at the extremity 

 of the foot. There is a large right shell-lobe and a well- developed 

 left shell-lobe; the right neck-lobe is small, the left neck-lobe 

 rather narrow and succeeded after a short interval by another 

 very small lobe close up to the left shell-lobe. The roof of the 

 respiratory cavity is mottled sparsely with black. In a full-grown 

 specimen from the same locality the colour was ochraceous, the 

 peripodial fringe and sole of the foot with a green tinge. When 

 the shell is removed a broad black band is conspicuous near the 

 rectum, the membrane of the visceral sac covering the branchial 

 cavity is speckled and streaked all over, and one large longitudinal 

 streak occurs on about the middle line ; while the integument 

 covering the renal organ is black, forming a second, more posterior, 

 brownish streak. There is a long pointed lobe over the mucous 

 gland. The right shell-lobe is large and tapering, the left is well 

 developed, the dorsal lobes as before described. 



The generative organs were not found at their full state of 

 development : the animals were taken in the winter months, still 

 there was quite sufficient to show all the important characters. 

 In the male organ the retractor muscle is attached to a coiled 

 csecum and there is a moderately long flagellum. The amatorial 

 organ is very long, also the spermatheca. 

 The jaw has a central projection. 



The teeth of the radula are as is usual in the genus Macro- 

 chlamys as regards the centre tooth and admedians, the arrangement 

 being as follows : 



33 . 2 . 12 . 1 . 12 . 2 . 33 

 47 . 1 . 47 



The teeth from the 15th to the 18th inclusive have a cusp on the 



