10 SECOND YARKAND MISSION. 
18. LlMNiEA TRUNCATTJLA, Mull. 
About thirty specimens from Leh, agreeing fairly with pi. ii, fig. 26 of ‘ Eedsch. Reise 
Moll.’ Dr. Stoliczka on a former visit to the Himalayas, found a still more produced form 
abundant at Spiti ; also a shorter form at Kulu, Kotegarh, & c. 
19. Limn.ea lessons, Iss. 
Issel, Moll.. Persia, 1865, pi. iii, figs. 64—66. 
I cannot separate this form, even as a variety, from Issel’s Persian shell, for specimens 
of which, from Karman (Persia), I am indebted to Mr. W. T. Blanford. Dr. Stoliczka 
collected some fifty specimens of an almost perfectly similar form in a stream east of the 
Pamir-kul ; they are like the type form imperforate, with similar short spire and rather 
expanded aperture. The Pamir specimens are of rather thicker substance ; the characteristic 
orange colour is also more marked. 
Long. 8, diam. 5f ; apert. alt. 5f, lat. 3f mm. 
20. Planorbis (Gyraitlus) albus, Mull., var. 
More than a hundred specimens were found on the shores of Lake Pankong ; they consist 
mainly of two forms, apparently equally plentiful, one with a more narrow umbilicus than 
in any European specimens I have seen, in this respect agreeing with some varieties of P . 
convexiusculus, Hutt., and with pi. iv., fig. 35, “ Mai. Bl.,” 1875 (P. riparius ); in other respects, 
however, resembling figs. 1 — 3, loc. cit., of typical P. albus : diam. 4f, alt. 1^ mm. 
The other, with more open umbilicus, agreeing with figures 1 — 6 and 10 — 12, loc. cit., 
intermediate between the two : diam. 5, alt. 1^ mm. 
There are also two specimens with very open umbilicus, more so than in fig. 14, in other 
respects more like P. Icer/is : diam. 6J, alt. 1| mm. 
Two or three deformities were also found, in which the last whorl is completely detached 
and the spire curiously raised, presenting some analogy to specimens of Valvata. 
Prom Leh, also, some hundred specimens were brought of a form agreeing exactly in 
colour and every other respect with figs. 1 — 3. Mixed up with them equally abundantly was 
another allied form, which however, I have classed separately as P. Icsvis, var. 
More than a hundred specimens were collected at Yarkand ; the majority fairly represented 
by figs. 4—6, loc. cit. Some few however, have the last whorl near the aperture considerably 
deflected, as in figs. 15 and 21 ; the umbilicus varies in being a little more or less open. Nine 
specimens from 5 miles west of Panjah (Badakshan) ; they agree fairly with the preceding 
Yarkand form. 
21. Planorbis (Gyraulus) l/evis, Aid., var. ladacensis nov. 
Planorbis lams, Alder, Trans. Nat. Hist. Northumb,, 1830. 
glaber , Jeffr., Trans. Linn. Soc. Lond., 1830. 
I confess I am unable to distinguish quite satisfactorily the differences between this 
species and the preceding. This Leh form, in any case, seems fairly separable from all the 
