62 
CONCHOLOGIA IND1CA. 
2. U. parma? var. Benson. 
Bhamao. 
May possibly be a distinct species, but having seen 
but one specimen we do not venture to decide. 
3. U. rugosus, Grnel. Syst. Natur. f. 3222, for 
Cliernn. Concb. Cab. vol. 10, f. 1649 ( = Kust.ed. 
Chemn. Un. pi. 97, f. 5). 
Coromandel. 
Between macilenta and scobina. A single valve 
has been lately obtained which more precisely re- 
sembles the figure of Chemnitz. 
4. U. Mandelayanus, Theobald, J. Asi. Soc. Beng. 
1873, p. 208, pi. 17, f. 2. 
Mandelay, Birmah. 
Specimens are occasionally of a rich grass-green. 
5. U. macilentus, var. 
Surat; near Chimoor; Pem Gunga. 
6. U. Tavoyensis, Gould, Proc. Bost. hi. H. vol. 1, 
p. 140 : Otia Con. p. 191. — Reeve, Conch. Icon. 
Unio, f. 49. 
Tavoy. 
Our specimen was sent by Gould to Benson. 
7. U. Tavoyensis ? var. — U. Tavoyensis, Kust. 
ed. Chem. Unio, pi. 48, f. 2. 
Birmah. 
Very much larger and rounder than the typical 
form. 
India is the reputed habitat of many Uniones 
which modern researches have failed to discover 
there. Amongst them may be specified Spengler’s 
crassus (from Tangiers), his conus (=tumidus, 
from Europe), his radiatus (from North America), 
his nodosus (=the European pictorum), &c. Eydoux 
in Guerin’s Magasin de Zoologie (1838, pi. 118) 
indicates U. Keraudreni (f. 1) and U. Gaudichardi 
(f. 3), as from Bengal (the first may, perchance, be 
U. leioma, but looks more like a Cape shell), and 
U. Gerbidoni (f. 2) from Coromandel : these two last 
remind us of U. Niloticus and U. lithophagus, both 
from the Nile. The supposed Indian U. digitiformis 
of Sowerby comes from China ; U. Bengalensis of Lea 
from the Philippines. U. velaris of Benson and U. 
delphinus of Spengler must, also, be expunged from 
our list. 
PLATE CLY. 
UNIO, CORBICULA, CYCLAS, PISIDIUM, 
TRICULA, ACHATINA. 
See previous plates cxxxviii for Corbicula, and xvii, 
xviii, xxxv, xxxvi, lxxviii, cii, for Achatina. 
1. T. montana, Benson, Calcutta J. Nat. H. 1842 : 
An. Nat. H. 1862, Dec. 
From a stream at the head of Bheemtal, on 
stems of a water iris. 
2. U. Bhamaoensis, Theob. J. Asi. Soc. Beng. 
1873, pt. 2, p. 207, pi- 17, f. 1. 
Near Bhamao, and from Western Prome, 
Pegu. 
3. U. Vuleanus, Hanley, Proc. Zool. Soc. 1875. 
Birmah or Pegu. 
The English editor has lost the precise locality of 
this lovely species. 
4. A. senator, Hanley, Proc. Zool. Soc. 1875. 
Cottyam Hills, S. India. 
We have seen only four specimens (none perfect) 
of this peculiar Glessula. 
5. A. Isis, Hanley, Proc. Zool. Soc. 1875. 
Southern India. 
The hair-like lines and narrow fillet (the latter not 
a constant feature) are found in no other Glessula of 
so elongated a shape. 
6. Cor. Bengalensis, Desh. Proc. Zool. Soc. 1854, 
p. 344: Cat. Brit. Mus. Yener. p. 224. — Prime, 
Ann. Lyc. N. Y. 1866, vol. 8, p. 220, f. 52. 
River Jumna. 
7. Cor. trigona, Desh. Proc. Zool. Soc. 1854, 
p. 344: Cat. Brit. Mus. Vener. p. 224. — Prime, 
Ann. Lyc. N. Y. 186b, vol. 8, p. 221, f. 53. 
Pondicherry. 
This and the last are figured from the types in the 
British Museum. 
8. Cor. Iravadica, Blanford, MSS. 
River Irawaddy, Pegu and Ava. 
This has been distributed by the author as pisum 
and Iravadica. It has probably been published, but 
the reference cannot be found at the moment of going 
to press. 
9. Cy. Indica, Deshayes, Proc. Zool. 1854, p. 342, 
