22 
CONCHOLOGIA INDICA. 
7, 8, 9. U. Tennentii, Hanley, for Mya corrugata, 
Wood, General Conch, p. 108, pi. 24, f. 1, 2, 3. 
“ Ceylon.” 
Our locality is not well authenticated. The shell 
was found without name in the Bensonian collection, 
as from British India. 
10. U. corbis, Benson, in Hanley’s Recent Bi- 
valves, p. 386, pi. 23, f. 43. 
Assam. 
So rare a shell, that we have only seen one perfect 
specimen. It is a solid little species. 
PLATE XLYI. 
UNIO. 
1. U. scutum, Benson’s MSS. in Reeve’s Conch. 
Icon. Unio, f. 510. 
Tenasserim River. 
2. U. scobina, Benson, in Hanley’s Recent Bi- 
valves, p. 382, pi. 22, f. 40. 
Assam ; Mysore 1 
The specimen delineated is the almost unique origi- 
nal type, cleared partially of the ferruginous coating 
with which it was invested. The Mysore specimens 
are too worn to be positively pronounced identical. 
3. U. scobina ? var. Benson. 
Belgaum, Deccan. 
A half link between scobina and occatus. 
4. XT. generosus, Gould, Proc. Boston Soc. Nat. H. 
vol. 2, p. 220 ; Otia Conch, p. 201. 
The shell here delineated was sent by Gould to 
Benson as typical ; the alated form referred by us to 
lamellatus (pi. 9) belongs to it. Except for its dentition, 
this shell might be referred to the large Birmese form of 
marginalis, or even to the Cingalese Thwaitesii. Its 
affinities, on the other hand, incline closely to the U. 
lamellatus of Lea. The peculiar hinder surface, 
which Gould terms subcostated, results' from a close 
sujDerficial concentric sulcation. 
5. 6. XT. Bonneaudi, var. Eydoux and Souleyet. — 
Reeve, Conch. Icon. Unio, f. 515. 
Pegu. 
The sculpture is scarcely so strong in the smooth 
variety delineated as in another of our figures, and 
the shading here obscures the radiating sulci in front. 
7. XT. generosus, Gould, var. angustior. 
Pegu. 
PLATE XL VII. 
CYCLOPHORXTS and AULOPOMA. 
See previous plates i. ii. iii. iv. xxxiii. xxxiv. 
1, 2. A. grande, Pfeiffer, Proc. Zool. Soc. 1855, 
p. 104 : Mon. Pneum. vol. 2, p. 39 : Novit. Conch, 
vol. 1, pi. 19, f. 11 to 13. 
Ceylon. 
3, 4. A. Hoffmeisteri, Troschel, Zeitsch. Malak. 
1847, p. 43. 
Ceylon. 
The description referred to is only in German, and 
very brief. 
5, 6. C. hispidulus, Blanford, Jour. Asi. Soc. Beng. 
vol. 32 (1863), p. 321 ; Cont. Ind. Mai. pt. 4, p. 3. 
Mya Leit Doung, near Ava. 
The spiral hispid ridges of the umbilicus are not 
adequately rendered in our lithograph. 
7. C. exul, Benson, An. Nat. Hist. ser. 2, vol. 14 
(1854), p. 412. — Pfeif. Mon. Pneum. vol. 2, p. 46. — 
Reeve, Conch. Icon. Cyclop, f. 53. 
Bhamoury, at the foot of the Rohillano- 
Himalayahs. 
The delicate shell here depicted is unique. 
8. C. cratera, Benson, An. Nat. Hist. ser. 2, vol. 18 
(Aug. 1856). — Pfeif. Mon. Pneum. vol. 2, p. 55. 
Ceylon. 
Possibly a form of the annulatus of Troschel. 
9. C. cytopoma, Benson, An. Nat. Hist. ser. 3, vol. 
5 (1860), p. 385. — Pfeif. Mon. Pneum. vol. 3, 
p. 72. 
Ceylon. 
Scarcely differs from the previous species, except 
in fragility and the want of a double lip. 
10. C. tryblium, Benson, var. conica. See plate 
xlviii. f. 1. 
The typical form is delineated in our next plate ; 
that here represented is remarkable for its narrow 
umbilicus and its elevated spire. 
