4, SECOND YARKAND MISSION. 



Diam. 16^, alt. 7-| ; apert. diam. 8, alt. 7^ mm. 



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 1J 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 H. 

 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. 1J 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) MTJSCOBTIM, L. 



Fourteen specimens from Pasrobat, 3 J mm. in length ; fifty from Kaskasu, 3J mm. in 

 length ; fifty from shores of Lake Pankong, a form remarkable for its produced whorls, 3f to 

 4| 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. 



