4 
SECOND YARKAND MISSION. 
Diam. 161, alt. 7{- ; apert. cliam. 8, alt. nun. 
About a hundred specimens from Sasak Taka and Pasrobat, west of Yarkand. 
Twelve specimens, in poor and weathered condition, from north of Tangitar on carboni- 
ferous limestone ; they are a remarkably small variety, about half the typical size, the two 
bands are scarcely discernible, and they are not quite so flat. 
7. Helix (Vallonia) costata, Mull., var. asiatica, nov. 
This is probably the variety recorded by von Martens from Turkestan, measuring 3 mm . 
in diam. and 1| in height ; it only differs from the typical European form by its larger size 
and slightly stronger subangulation at base near the umbilicus. More than a hundred and 
fifty specimens were collected by Dr. Stoliczka, all of approximately the same size, at Pasrobat, 
Sasak Taka and Wakhan ; one of the specimens from the last locality I have taken as my 
type of var. asiatica. 
I take this opportunity of noting that Mr. W. T. Blanford brought back from 
Mazendaran in Persia numerous specimens of a variety, the same size as the European form 
and with similar sculpture, but having the umbilicus a shade more open. 
8. Helix (Vallonia) ladacensis, n. sp. {an H. costata, var.?) 
I have long separated this form, which can be distinguished from all the varieties of 11 . 
costata at a glance by its much more open umbilicus, at least half as open again ; it is a 
much larger shell than typical H. costata, about the same size (a trifle larger) as the 
above described var. asiatica ; the sculpture is finer, closer together and more beautifully 
regular ; the spire is flatter, the suture more excavated ; the base is scarcely, if at all, subangulate 
near the umbilicus, as it is in so marked a way in the preceding ; one of the best character- 
istics of H. ladacensis is the considerably higher and more expanded aperture with a corre- 
sponding less oblique columella ; the umbilicus is so much more open that the whorls within 
can be clearly traced up to the apex itself. 
Diam. 3J, alt. mm. 
Type from Mataian in the Dras Valley (Ladak), where Dr. Stoliczka found about sixty 
specimens. One of the specimens I sent Dr. von Martens from this locality possesses, he 
informs me, a “little plait on the wall of the mouth.” Unfortunately I have not been able 
myself to detect this plait in any other specimens. Ten specimens were brought from Leh 
(chief town of Ladak) ; twenty from “Narka” (?) in West Tibet, slightly smaller and with 
more raised spire than Mataian specimens. 
9. Pupa (Pupilla) muscorum, L. 
Pourteen specimens from Pasrobat, 3 J mm. in length ; fifty from Kaskasu, 3 J mm. in 
length ; fifty from shores of Lake Pankong, a form remarkable for its produced whorls, 3f- to 
44 mm. in length; twenty from Spiti, 1 agreeing with the preceding form, in the great 
difference in the length of the spire in different individuals, the whorls being sometimes much 
produced, at other times curiously shortened and compressed ; four specimens from Mataian, 
one only perfect unfortunately. I have considerable doubts in referring this Mataian form to 
1 Procured by Dr. Stoliczka on a previous visit to the Himalayas. 
