274 ° Land and Freshwater Shells from the Shan States. [No. 4, 
usually three, series of prominent tubercles, ranged in symmetrical spiral 
order with four non-tubercular spiral keels on the last whorl towards the 
mouth. The tubercles form oblique transverse ribs, but the ribs are 
a subordinate feature to the spiral ornamentation. 2.00 0.75. 
4th. Pyramidalis. Ornamentation like the last var. but form very 
squat, with rapidly increasing whorls. The shell is slightly corulescent, 
with four dark brown stripes visible in the interior, corresponding with 
the spiral keels outside. Columella slightly yellowish, apex but little 
eroded. 1.90 * 0.85. 
Grotto in Nam-mah stream. 
Qnd. Baccifera. This var. is intermediate in its character between 
vars. 2 and 8. Its whorls are ornamented with four or five rows of 
beaded keels, the transverse ribbing being often well marked likewise. 
Most of the specimens were dead shells. 1.90 & 0.75. 
It is noteworthy that the ordinary type of JZ. variabilis, or the huge 
specimens of the race met with in the Arakan hills, are not represented 
in the collection, though the abundance of calcareous rocks and eale tuff 
would, primé facie, lead us to expect shells of similar, if not greater, 
dimensions. Climate and a lower average temperature of the streams 
in the Shan country may possibly explain the small size W. variabilis 
there attains, since I have a Maulmein shell which measures 4.00 
X 1.30, and Arakan specimens not rarely attain (decollated shells). 
3.00 x 1.30. 
3. 1 Paludomus. 
A single specimen of a large paludomus, which I have not 
yet identified, occurred in the collection. 
Fam. Patoupinipz, 
4. 1 Paludina naticordes, un. s. 
Two marked varieties of this shell occur. A smooth one with one, 
two or three filiform keels, and a strongly keeled var. with prominent, 
rugose keels. The species is probably undescribed and may be thus 
characterised. 
P. naticordes, Th.—Testa turbinata, sub-polita, solida, pallide flaves- 
cente cornea ad peripheriam carinaé munita; marginibus callo junctis, 
callo columellari non raro valde incrassato, umbilicum obtegente, 
Varietas fasciata, fasciis duabus castaneis ornatur, hac superperipheri- — 
ali, illé juxta suturam posité. Anfractu ultimo tertia notest a carina 

