Three dead specimens only of this interesting form were found on the First
Expedition on the Kakhyen Hills; the spire is a trifle more depressed than in typical
specimens from the Shan States.
P t e r o c y c l u s f e d d e n i , Blanf.
Pterocyclus feddeni, Blanf., Journ. As. Soc., Bengal, vol. xxxiv, 1865, p. 9 8 ; Con. Indica, pi. 184,
fig. 1 Nevill, I. c., p. 29.
Tolerably abundant at Bham6 and above the Great Limestone Cliff, 2nd Defile,
Irawady.
Genus A l y c 2E U s , Gray.
Ai,YC.a:Trs a m p h o r a , Bens.
Alyceeus amphora, Bens., Ann. and Nag. Mat. Hist., ser. 2, 1856, vol. xvii, p. 226; Con. Indica,
pi. xci, figs. 2, 8 ; Nevill, I. <?., p. 29.
A few small specimens of the widely distributed Burmese species were found
at Bham6.
CTENOBRANCHIA.
Family—PAL UDINID2E.
Genus B i t h y n i a , Gray.
B i t h y n i a g o n io m p h a l o s , Mori.
Paludina goniomphalos, Mori., Rev. e t Mag. Zool., 1866, p. 167 j Ser. Conch., iii, pi. xiii,fig. 4 ;
• Nevill, 1.. e., p. 29.
Bithynia iravadica, Blanf., Proc. Zool. Soc., 1869, p. 446; Con. Indica, pi. xxvii, fig. 10.
A comparison of the type specimens in the Indian Museum of B. iravadica
with typical specimens of B. goniovnpJialus from Cochin China prove the two
species to he perfectly identical. Specimens from Siam of B. siamensis, Lea, are
exceedingly closely allied, and may prove to be only a variety; they differ, however,
by their smaller size, and by the last whorl being rounded and not ungulate,
as is the case in P. gomomphalus. This species was obtained abundantly by
Dr. Anderson at Ava, Mandalay, and Kabyuet.
B i t h y n i a t u r r i t a , Blanf. Plate LXXX, figs. 4 & 4a.
FairlanJcia? (Bithynia) turrita, Blanf., Proc. Zool. Soc., 1869, p. 446.
Bithynia turrita, Nevill, I. c., p. 29.
This most distinct and interesting species was not found on the Second Expedition
; the single type in the Indian Museum, therefore, remains unique. The
species is, I think, a true Bithyma, certainly not a FavrbanJcia. I t was found at
Kyoutong, in Upper Burma.
B i t h y n i a m o r e l e t ia n a , Nevill.
Bithynia moreletiana, Nevill, Journ. As. Soc., Bengal, vol. xlvi, 1877, p. 29.
In shape resembling B . lutea, Gray1, spire peculiarly short, apex very obtuse
and flattened, always eroded, but not decollated; whorls 3£, the last obliquely
produced; always imperforate, both in very young and very old shells; margins of
aperture entire, broadly reflected, produced and angled at base; outer margin
rounded; epidermis dark olive-green; under the lens a minute spiral sculpture can
be detected. Young specimens invariably show a sort of yarix, formed probably
at a period when their growth is arrested by some cause; this varix becoming
absorbed in adult specimens. Above 200 specimens were found at Yaylaymaw.
Long. max. 8f, min. 7J, diam. max. 6, min. 7f mm.; long, anfract. ult. 7;
long, aperty fife, diam. 3 mm.
This species can easily be distinguished from the Indian B . cerameopoma and
B. lutea: it is imperforate, has fewer whorls, a shorter and more obtuse spire, the
columellar margin is less acutely angled at base, epidermis green instead of brown.
Genus M a r g a r y a , Nevill.2
This remarkable shell is very difficult to classify, owing to its great analogy to
two fresh-water genera, Baludina and Melania. I think, however, there is little
doubt but that it will have eventually to rank as a sub-genus of Baludina.
Margarya is characterized by its produced, Melania-like spire, composed of scalari-
form, rapidly increasing whorls, with very distinct suture; apex obtuse, sculptured
with prominent spiral ribs; rimate (or umbilicate ?); margins of aperture rounded,
not continuous; animal and operculum unknown.
M a r g a r y a m e l a n io e d e s , Nevill. Plate LXXX, f i g . 5.®
Margarya melanioides, Nevill, Journ. As. Soc., Bengal, vol. xlvi, 1877, p. 80.
Shell large; spire produced, Melania-like, with very deeply excavated suture;
apex obtuse; whorls six, convex, the first two flat and obtuse, the third large and
tumid (bigger in proportion than the fourth); the four last whorls are girt with
three nearly equally distant, raised, irregularly nodulose keels, the middle one much
the largest, having its nodules more developed and of a more or less compressedly
transverse shape; umbilicus very small, almost entirely covered by the reflected
columella; aperture almost circular, nearly as broad as high; columella short,
evenly ro u ted , moderately reflected over the shallow umbilicus; a slight callus
between the columella and outer lip; remains of an epidermis distinctly traceable.
1 Con. Indica, pi. xxxvii, fig. 7.
* Journ. As. Soc., Bengal, vol. xlvi, 1877, p. 30.
3 Mr. Nevill first named this shell P aludina margariana, and as such it stands in the accompanying plate, which
was printed before Mr. Nevill was led to regard this fine form as distinct from Paludina.