180 Godwin- Austen — On the Operculated LandsJiells [No. 3, 



Eastern Asia' (Ann. and Mag. Nat. Hist., June 1864), and considered by 

 him to be perhaps worthy of specific distinction ; in this (which I distinguish 

 as var. a) the internal tube opens in the peristome outwards, with no 

 tendency to form an external sutural tube : of it I obtained three fine 

 specimens on Shengorh Peak, where it was associated with the other 

 forms. In the other (var. (3, or var. tubulus), which was only obtained 

 in one locality at 5000 feet on the flanks of Toruputii, there is a still 

 wider departure from 8. Blanfordi, Bs. ; the internal tube passes out just 

 behind the peristome, almost in the same way as in Rhapliawlus chrysallis, 

 Bs., and is directed upwards for about - 05" of an inch. These differences 

 are very remarkable, occurring as they do in distinct species from Malayana, 

 and I should be inclined to consider them worthy of specific titles were the 

 habitats of the two forms wider apart, but both occur together, and in no 

 other point of structure can I detect any constant difference. I at first 

 thought that var /3. was more tumid and depressed and that it had a more 

 developed aperture, but similar continuous, thickened, circular peristomes are 

 to be found among the normal forms, when a large series is examined ; and 

 the same holds good of the external shape. I am sorry that I had no oppor- 

 tunity of examining the animals of these three forms : some considerable 

 modification of parts must surely be required to produce the very great differ- 

 ences in the length and direction of this tube-like process near the aperture. 

 Particularly fine examples of S. Blanfordi were found, as much as 

 013 in length and 0"28 in. in diameter. 



Megalomastoma patjpeeculttm, Bs. 



Hab. — Shengorh Peak and Toriiputii. This form was found at all the 

 higher elevations, whereas I did not obtain a single example that will assimi- 

 late with M. fimiculatum from Dar jeering, either in form or colouration. 



Megalomastoma tanycheiltjs, n. sp., PI. VII, Pig. 5. 



Shell cylindrical, turreted, solid, pale ochreous, sometimes with a tinge 

 of green, rather strongly and diagonally striated. Spire straight, sides 

 nearly parallel, apex conoidal, suture shallow. Whorls 9, with very slight 

 convexity of side. Aperture vertical, large, and circular, the peristome 

 continuous, very largely developed, thickened, and expanded ; at base of the 

 last whorl is a strong keel which terminates above near the centre of aperture. 

 Operculum composed of several horny layers, which appear to be formed 

 slowly and concentrically on a line radiating from the centre to the circum- 

 ference. 



Length. 1*20, diam. 0'35, diam. apert. (peristome included) 0'32 in. 



Hab.— Dikrang valley, low down, ranging up to about 2,500 feet and 

 very abundant. 



