MUSEUM OF COMPARATIVE ZOOLOGY. 159 
its width (11 mm.) equal to 4 length of head. Postorbital portion of head about 
24 times diameter of eye. The operculum terminates in a flat obtuse spine, its 
length, including the flap, about equal to diameter of eye. Preoperculum 
entire, with a prominent ridge in advance of its posterior edge. The orbit is 
rounded, the least diameter of the eye equal to the length of the snout, and 
contained 43 times in length of head (slightly less in the larger specimen). 
Snout very broad, obtuse, the intermaxillaries extending beyond it, its width 
at the nostrils equal to about twice the length of the eye. Posterior extremi- 
ties of the intermaxillary processes elevated, producing a decided hump upon 
the top of the snout. The ridge formed by the prefrontal and suborbital bones 
terminates very slightly behind the posterior margin of the orbit, and is not 
connected with the angle of the preoperculum. 
Nostrils immediately in front of the lower part of the eye, not tubular, the 
anterior one very small, pore-like, only about } as large as the posterior one. 
Distance of anterior nostril from tip of snout about 3 length of eye. Length 
of barbel (51 mm.) 62 in length of body, and equal to length of head without 
snout (in the larger specimen the barbel is as long as the mandible), more than 
3 times as long as the eye. 
There are no true teeth, the intermaxillaries and mandible being broad 
plates, covered with minute asperities. A naked space at the symphysis of 
the intermaxillaries. 
Distance of first dorsal from snout (77 mm.) nearly 33 times length of its 
base ; the fin contains 2 spinous and 10 or 11 branched rays ; the first spine 
is minute, the second (in the types) somewhat mutilated, its length nearly 3 
in length of head.* It is not stouter than the branched rays, and is entirely 
smooth. 
The second dorsal is separated from the first by a very short interspace, 
equal to about 4 of the length of the eye. Its rays are long, subequal, the 
first slightly the longest, its length equal to that of the base of the first dorsal. 
The anal is much lower than the dorsal, the longest rays being in front, its 
third ray about half as long as the first ray of the second dorsal ; this fin is 
inserted under the seventh ray of the second dorsal. About three of the termi- 
nal rays might be considered caudal rays. 
Pectoral inserted slightly in advance of the ventral, which is in about the 
same vertical with the origin of the first dorsal. The second ray of the pecto- 
ral is slightly produced. The length of the fin equal to that of the head 
without the snout. 
Ventral insertion distant from the tip of the snout a distance equal to that 
of first dorsal from snout. The first and second rays are filamentous, the latter 
slightly the longer, and extending to the fifteenth (or eighteenth in larger 
specimen) ray of the anal fin. 
* Judging from the larger specimen, this spine in a usual state would be consid- 
erably longer. 
