152 LAND AND FRESHWATEE 



Conch. Icou. f. 1151), has too sharp au apex; in this position the 

 band is not well seen, but it is indicated inside the aperture. 



The first two or three whorls of the shell (Plate CIV. figs. 1, 1 «, 1 h) 

 show hardly any sculpture, thence a very finely decussate surface gra- 

 dually follows, becoming strong towards the aperture ; under a high 

 power the cross-striation produces a close series of papillate dots. 



The living animal of this species was figured in Vol. I. Plate XIX. 

 fig. 2 (1883), from a drawing made by a native artist under Fcrd. 

 Stoliezka's superintendence (No. 46). The mantle-zone is figured 

 on Plate XX. figs. 3, 3 «, from a specimen in spirit collected by 

 \V. T. Blanford at Darjiliug. I had not at that time examined the 

 large collection made and sent to me by Mr. Ilobert of the Survey 

 Department, so did not refer to the species in the text. 



Description of the animal. A specimen from Ilissom Peak in tho 

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

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

 out; the pedal margin (Plate CIV. fig. 3) 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 

 (fig. 2) 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 (fig. 4) 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 (r, fig. 4), 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 (fig. 4). 

 There is a long pointed lobe over the mucous gland (fig. 3). The 

 right shell-lobe is large and tapering, the left is well developed, 

 the dorsal lobes as before described. 



The generative organs (figs. 5, 5 a, 5 h) were not found at their 

 full state of development : the animals were taken in the winter 

 months, still their stare was quite sufficient to show all important 

 charact<^rs. In the male organ ^^rig. 5 a) the retractor muscle is 

 attached to a coiled ctecum and there is a moderately long flagellum. 

 The amatorial organ is very long, also the spermatheca. 

 The jaw (fig. 6) has a central projection. 



The teeth of the radula (fig. 7) are as is usual in the genus 

 Macrocldamys 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 loth to the ISlh inclusive have a cusp on 

 the outer side below the point; this cusp becomes rapidly very 



