6 SECOND YARKAND MISSION. 



Of the Yarkand species, Dr. Stoliczka found about fifty specimens, in all stages of growth, 

 at Sasak Taka, many of them alive ; also about twenty at Pasrobat. 



12. SUCCINEA PFEIFFERI, Rossm., var. 



This Yarkand variety is only distinguishable from typical European specimens by its 

 smaller proportions, slightly stouter texture, and deeper amber colour. 

 Long. 11, diam 6; apert.long. 7J, diam. 4 mm. 

 Ten specimens from Yarkand and nine from Sasak Taka. 



SUCCINEA PFEIFFERI, var. SUBINTERMEDIA, nov., Figs. 32-33. 



From near Yarkand, Dr. Stoliczka also brought back about twenty specimens of a small 

 form, easily distinguishable from the preceding by its less everted last whorl, thinner texture 

 and lighter colour ; it is in some respects intermediate between S. putris and S. pfeifferi, 

 but its more produced spire seems to me to compel its classification with the latter ; the 

 nearest European form we possess in the Museum is a Transylvanian shell sent from Germany 

 as S. amphibia (putris) var. intermedia. The Museum also possesses three specimens from 

 Candahar, presented by the late Captain Hutton, in no way to be distinguished from the 

 Yarkand form, except in being about half as large again ; the columella is less rounded and 

 decidedly more subangulate at the base, than in German and French specimens. I found a 

 variety, however, from England agreeing in this respect with our Asiatic forms, though the 

 spire is less produced in the latter ; it seems to me that the transition as regards the shell itself 

 from S. putris to S. pfeifferi is almost, if not quite, imperceptible ? 



Long. 11, diam. 5| ; apert. long. 7f , diam. 4J mm. 



13. SUCCINEA PUTRIS, L. var. 



About forty specimens were found living on grass in a marsh near Yarkand city ; it is 

 a small, thin and glassy variety, resembling in miniature a form from Wales sent me by the 

 late Mr. F. Layard as S. putris, L., var. vitrea ; its more swollen shape, less produced spire 

 and more everted last whorl distinguish it from the form I have described above as 

 S. pfeijfferi, var. sub-intermedia ; its more globose shape, less produced spire, thinner and more 

 vitreous texture from my var. yarkandensis. 



Long. 10 ; diam. 6 ; apert. long. 7, diam. 4| mm. 



14. LlMNJEA AURICULARTA, L., 



This form agrees fairly with Kobelt's figure (Mai. BL, 1870, pi. lii, fig. 8, L. auricu- 

 lar ~ia, var. ventricosa ; London) ; the principal difference is the apparently constantly more 

 broadly reflected columella, which is also more rounded at the base ; the great tendency to 

 deformity in the Sirikul specimens is very striking ; it appears to me that this form would 

 be almost as well classified as an extreme variety of L. lagotis, allied to var. obliquata . 



