8 
SECOND YAEKAND MISSION. 
tudinal striation however exists; aU the specimens, young and old, are without exception of 
the peculiar thickness which suggested its excellent name of solidissima ; the five whorls 
agree with those of Kohelt’s original figure, which I suspect was taken from a Lake Pankong 
specimen, and do not show the suhangulation described in the preceding; the aperture is much 
more expanded than in Kohelt’s typical figure, which was evidently taken from a rather 
young shell, the very thick columella in most specimens agrees with that of the ty|)e, hut 
in some few it is abruptly twisted hack, as in pi. ii, fig. 21 of “ Eedsch. Moll.” {L. ohliquata, 
V. Mart.) 
These specimens are interesting as removing one of the few slight differences be¬ 
tween L. obliquata and L. solidissima ; my Pankong specimens clearly show the more expand¬ 
ed aperture to be merely a question of age and condition, as is also the gradual slope of the 
outer hp; nearly all my specimens agree in this latter respect with typical obliquata^ only 
very few showing the angular outer lip of typical solidissima; Kobelt in his description 
pointed out the close affinity of the two forms, and also that L. obliquata must be classed 
rather with L. lagotis, than L. auricularia ; the shortened columella seems to me the best 
characteristic of the latter group, as shown in the form I have already described as a variety 
of that species; the difference is also excellently portrayed in von Marten’s figures, pi. ii^ 
figs. 20 and 21, “ Eedsch. Moll.” The Pankong shell, though always preserving its chief cha¬ 
racteristics, varies most remarkably, as will be seen from the accompanying measurements. 
The ordinary form:—long. 22, diam. 17^; apert. long. 18, diam. 12^ mm. 
A form with more produced spire and contracted aperture, agreeing with Kobelt’s figure: 
—long. 22, diam. 15^; apert. long. 16|, diam. 10^ mm. 
A unique form, with quite depressed spire:—long. 19, diam. 15^; apert. long. 17|-, diam. 
12 mm. 
A form (represented by six or seven specimens), with unusually expanded and more 
rounded aperture:—^long. 18, diam. 17; apert. long. 14^, diam. 12 mm. 
About a hundred specimens from the shores of the Pankong Lake: both young and old 
specimens show the same peculiar thickness of shell. 
Limn^a lagotis, var. costtjlata. 
Zimncsa lagotis, var. costulata, v. Martens, Eedsch., fieise, Moll., pi. ii, fig. 24. 
More than a hundred specimens were collected by Dr. Stoliczka at Leh, agreeing exactly 
with figs. 22 and 24 {loo. cit.). I cannot consider the forms there figured as belonging to 
even different varieties; there are numerous individuals amongst the Leh specimens of all 
the forms and of every conceivable connecting link; the variety, as I understand it, appears 
to be fairly constant as regards size and colour; the spire, too, does not appear to vary much 
more than in the figures quoted; the columella, however, graduates from even a more rounded 
shape than in figure 22 B to the straight (or slightly bent back) form of figure 24 A. 
Long. max. 18J, diam. 12; apert. long. 13f, diam. 8f mm. 
Limn^a lagotis, var. yaekandensis, nov. 
This is a striking and handsome form, close to the preceding, but half as large again, with 
more produced spire, of five less convex whorls, much stouter texture and straighter, more 
