Perilampus. INDIAN CYPRINID#. 
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XII.—PERILAMPUS THERMOPHILUS, J. M. 
t. 54. f. 19. 
This curious little species was found in hot springs at Pooree by Mr. 
Cumberland, by whom two specimens were presented to the Medical Society, 
and afterwards obligingly submitted to me by the Secretary, Dr. Goodeve. 
The head is directed obliquely upward, and the tail downward. The 
caudal fin is however imperfect in both the specimens. 
Two short cirri in front of the upper jaw, and two long setaceous bristles 
at the angles of the mouth ; thirty-one scales along the lateral line, and seven 
rows of scales from the base of the ventrals to the dorsum; chin rounded and 
placed in front of the mouth. The fin rays are, 
DSi seo Visi Avy. C=? 
The temperature of the springs in which this species is very common was 
remarked by Mr. Cumberland to be 112° Faht. but they are said to die when 
placed in water heated to 120° Faht. 
The last three species from the small size of the anal fin should, were we 
to be guided by that character alone, be placed with the Leucises; but the 
small and obliquely raised head, peculiar form of body, and opposite position 
of the dorsal and anal fins, are characters which are not to be overlooked. 
On the other hand, there are species placed with other genera which might 
be said to belong to this, as Cyprinus daniconius among the Leucises, and 
Opsarius leucerus ; the first from having the lateral stripes of the Perilamps, 
and the second from its obliquely raised head; but in Cyp. daniconius the dorsal 
fin is opposite to the ventrals and the head is large, and although Opsarius 
leucerus has the head as well as the habits of a Perilamp, yet it has the 
elongated and slender form of an Opsarius, with the dorsal opposite to the 
anal, characters which separate it from the Leuciscs. 
