CONCHOLOGIA INDICA. 
43 
9. C. stenostoma, var. anguis, Sowerby. 
Top of Nilgherries, with the preceding. 
This shell (possibly a distinct species) is not merely 
larger than the preceding, but has the entire upper 
surface concentrically shagreened by wavy and some- 
what broken raised wrinkles. 
10. C. cadiscus, Benson, An. Nat. Hist. 18G0, ser. 
3, vol. 5, p. 385. — Pfeif. Mon. Pneum. vol. 3, p. 67. 
Matelle, Ceylon. 
This is the same shell we had given another view of 
in Part I. (pi. 3, f. 8, not 9), as a form of Thwaitesii ; 
at that time neither the collections of Benson nor 
Layard were adequately known to us, and even now 
the limits of parapsis, cadiscus, and Thwaitesii are not 
clear; Benson’s ideal of the last, however, does not 
seem that of Pfeiffer. 
PLATE CVI. 
CATAULUS. 
1. C. Templemani, Pfeiffer, Proc. Zool. Soc. 1852, 
p. 158 (as Pupina). — Mon. Pneum. vol. 2, p. 87. — 
Sow. Thes. Conch, vol. 3, pi. 264, f. 12. 
Ceylon. 
2. C. duplicatus, Pfeiffer, Proc. Zool. Soc. 1 854, 
p. 203. — Mon. Pneum. vol. 2, p. 90. — Sow. Thes. 
Conch, vol. 3, pi. 264, f. 2. 
Ceylon. 
Near the last, but has less convex whorls. 
3. C. Blanfordi, Dohrn, Proc. Zool. Soc. 1862, p. 
202. — Pfeif. Mon. Pneum. vol. 3, p. 88 : Novit. 
Conch, vol. 1, pi. 58, f. 11, 12, 13. 
Bollegalle in Ceylon. 
4. C. hsemastoma, Pfeiffer, Proc. Zool. Soc. 1856, 
p. 391. — Mon. Pneum. vol. 2, p. 89. — Sow. Thes. 
Conch, vol. 3, pi. 264, f. 11. 
Ceylon. 
5. C. decorus, Benson, An. Nat. Hist. 1853 (ser. 2, 
vol. 12, p. 96). — Sow. Thes. Conch, vol. 3, pi. 264, 
f. 13. 
Ceylon. 
6. C. Thwaitesii, Proc. Zool. Soc. 1852, p. 147. — 
Mon. Pneum. vol. 1, p. 138. — Sow. Thes. Conch, 
vol. 3, pi. 264, f. 15. 
Ceylon. 
7. C. Austenianus, Benson, An. Nat. Hist. 1853 
(ser. 2, vol. 12), p. 95. — Pfeif. Mon. Pneum. vol. 2, 
p. 88. — Sow. Thes. Conch, vol. 3, pi. 264, f. 9. 
Henerat Jodde, Ceylon. 
8. C. Layardi, Gray, "MSS. in Pfeif. Proc. Zool. 
1852, p. 160, pi. 13, f. 6. — Pfeif. Mon. Pneum. pt. 
2, p. 87. — Sow. Thes. Conch, vol. 3, pi. 264, f. 7. 
Ceylon. 
9. C. aureus, Pfeif. Proc. Zool. Soc. 1855, p. 118: 
Mon. Pneum. vol. 2, p. 88. 
Ceylon. 
10. C. Calcadensis, Blanford, J. Asi. Soc. Beng. 
1869 (vol. 38, pt. 2), p. 137, pi. 16, f. 8. 
Calcad Hills, beyond the limits of Travancore. 
Our example (named by the author) somewhat 
differs from the figure in the journal, but the species 
is said by Blanford to be very variable. 
PLATE CVII. 
UNTO. 
See previous plates ix to xii, xli to xlv. 
1. U. Xndicus, Sowerby, in Reeve’s Conch. Icon. 
Unio, f. 222. 
Nerbudda River. 
As yet so rare a shell, that we have seen only two 
adult specimens of the normal form. 
2. U. triembolus, Benson, An. Nat. Hist. ser. 3, 
vol. 10 (Septem. 1862), p. 190. 
Nerbudda River. 
3. U. favidens, var. Benson. See Plate XI. f. 3. 
Near the “ Seven Tanks,” Calcutta. 
This dwarf form ranges between pinax and pla- 
giosoma. Our figured example is solid, and displays a 
strongly marked sculpture, but we possess others 
(which remind us of the unrecognised Rajahensis) that 
are almost smooth, and comparatively fragile. 
4. U. Xndicus, var. aurea, Sowerby. 
Nerbudda River. 
Possibly the link between Indicus and Triembolus. 
5. U. exolescens, Gould, Proc. Nat. H. Boston, 
vol. 1, p. 141 : Otia Conch, p. 191. 
Tavoy, Birmah. 
Of the two examples received from Gould, the 
larger (a more beaked form) was in too bad a con- 
dition to be delineated ; the one we have figured is 
immature. The general aspect of the species reminds 
