v a r . c o r r i a n a , Lea.
TJnio corrimus, Lea, Trans. Am. Phil. Soc., v, pi. ix, fig. 25.
U. marginalia, var. corriana, Con. Indica-, pi. xliv, fig. 4 ; Nevill, I. p ., p. 88.
Pour magnificent specimens of this very marked variety were found at Yaylay-
„maw; the nacre is of the most beautiful salmon-pink colour; the only difference
from typical Bengal specimens is that the texture and teeth are thicker, and this is
the case also with specimens from Pegu.
Long. 115, lat. 55 mm.
U n i o f e d d e n i , Theob. Plate LXXX, fig. 1 1 .
Unio feddeni, Theob., Journ. As. Soc., Bengal, 1878, pi. xvii, fig. 8 ; Nevill, I. c., p 88.
Tolerably abundant in rice fields at Bham6; also at Yaylaymaw. I feel
quite sure tbat Mr. Theobald is wrong in recording this species as found in the
Pemgunga, Central India; typical specimens from Mr. Pedden are marked in the
carefully kept collection of Mr. H. P. Blanford as from Burma; the specimens
found by Dr. Anderson in Upper Burma confirm Mr. Blanford’s record of the
locality of the original type form, as opposed to that given by Mr. Theobald; Mr.
Pedden collected in both localities.
U n i o b t j r m a n t t s , Blanf.
Unio burmanus, Blanf., Proc. Zool. Soc., 1869, p. 453; Con. Indica, pi. xlii, fig. 1 - Nevill I c
p . 8 8 . r & i i • •,
This form was not found on the Second Yunnan Expedition. Pull-grown shells
are narrower and more produced, with the umbones much less prominent, and the
rugose sculpture also less developed than is the case with JJ. bhamoensis.
The types of JJ. barmmus from Bham6 are in the Indian Museum.
U n i o b h a m o e n s i s , Theob.
Unio bhamoensis, Theob., Journ. As. Soc., Bengal, 1878, p. 207, pi. xvii, fig. 1 • Nevill, I. p., p. 89.
Unio mandelayensis, Theob., Journ. As. Soc., Bengal, 1873, p. 208, pi. xvii fig. 2.
Not uncommon at Myadoung and Yaylaymaw; found also on the Pirst Expedition
at Mandalay, Bhamd, and Shienpagah. The two above forms can certainly not
be separated, as indeed might have been surmised from Mr. Theobald’s remarks in
the original description, large series from one locality showing that both varieties
run one into the other. The Pegu form mentioned in the original description of
JJ. bhamoensis differs a good deal more from both than the Bhamd from the Mandalay
one; it is a pity Mr. Theobald did not give this Prome variety a name, instead
of the Bhamd one.
U n i o f o l i a c e t j s , Gld., var. f r a g i l i s , Nevill. Plate LXXX, fig. 8.
? Unio foliaceus, Gld., Proc. Bost. Nat. Hist. Soc. ; Con. Indica, pi. xlii, fig. 3.
? U. peguensis, A nth., Am. J . Con., pi. xxv, fig. 2.
U. fragilis, Nevill, Journ. As. Soc., Bengal, vol. xliv, 1877, p. 89.
Ten specimens from Yaylaymaw only differ from the Pegu form, in that the
epidermis, except on the posterior angle, is quite smooth; unfortunately they all
seem young shells; the two biggest are exceptionally tumid, in this respect differing
from the others, as also from the Bhamd and Shienpagah specimens; in all of the
above the nacre is less yellow-tinged towards the umbones, and the teeth thinner
than in JJ. foliaceus. I t is a form extremely close to, if not identical with, the JJ.
comptus, Desh,1 stated by .MM. Crosse and Pischer to be the JJ. sumatrensis of Lea.
Type of var. fragilis from Yaylaymaw; long 34, lat. 17£, crass. 11J mm.
Three specimens from Bhamd, all young; long. max. 43, lat. 24, crass. 13 mm.
Thirty specimens from Shienpagah, all young; long. max. 32, lat. 17, crass.
9£ mm.
Specimens of JJ. foliaceus, from Pegu; long. 58, lat. 22, crass. 17 mm.
U n i o p d g i o , Bens.
Unio pugio, Bens., Ann, and Mag. Nat. Hist., 1862, p. 193; Con. Indica, pi. x, fig. 7 ; Nevill, I. p.
p. 39.
Abundant at Myadoung, Bhamd, and Yaylaymaw. Very young specimens are
rugose anteriorly, especially near the umbones.
Long. 57, lat. 27, crass. 20 mm.
U n i o b o n n e a t j d i , E. & S., var. Plate LXXX, figs. 10 & 10« & 12 & 12a.
Unio bonneaudi, Eyd. & Soul., Mag. de Zool., 1888, pi. ; Con. Indica, pi. x, fig. 6, and pi. xlvi,
figs. 5, 6; Nevill, I. p., p. 89.
Very abundant at Myadoung, Irawady, second defile, Shuaygoomyo, Yaylaymaw,
and Bhamd. I t varies considerably in being more or less rugose in sculpture.
Long. max. 52, lat. max.. 29, crass. 24 mm.
U n i o a n d e r s o n i a n t j s , Nevill. Plate LXXX, figs. 9 & 9« & 9b.
Unio andersoniana, Nevill, Journ. As. Soc., Bengal, vol. xlvi, 1877, p. 40.
This species was found at Myadoung in tolerable abundance, together with JJ.
bonneaudi and several other species; two specimens were also obtained on the Pirst
Expedition at Shienpagah. I t is next allied to JJ. pachysoma, Bens., and to some