MUSEUM OF COMPARATIVE ZOOLOGY. 159 



its width (11 mm.) equal to ^ length of head. Postorbital portion of head about 

 2| 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 4^ 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 | length of eye. Length 

 of barbel (51 mm.) 6f 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 3^ 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 ^ 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. 



