PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 355 



body is moderately elongate, rather slender, somewhat compressed 

 posteriorly, has a narrow band of scales close to its dorsal outline, and 

 is otherwise naked with the exception of a few prickles on the sides. 

 The head is naked; it has two small cutaneous appendages on the chin, 

 one near the end of each maxillary, two above the eyes, two on the 

 vertex, and one near the upper angle of each gill -opening. The bran- 

 ch! ostegal membrane is free from, the isthmus posteriorly. 



The greatest height of the body (.25) is one fourth of its length, and 

 equals the length of the external caudal rays (.25); its height at the 

 ventrals (.23) is contained 4J times in the length. The least height of 

 the tail (.07), equals the distance between the eyes (.07), and the length 

 of the antecedent spine of the second dorsal (.07), The length of the 

 caudal peduncle, measured from the end of the second dorsal to the origin 

 of the middle caudal rays, equals half the length of the maxillary (.16). 



The greatest length of the head to the end of the opercular flap (.37) 

 is contained 2| times in the length of the body, and equals twice the 

 length of the mandible (.185) ; its greatest width (.23) equals the length 

 of the base of the spinous dorsal (.23). The distance between the eyes 

 (.07) is contained 3 times in the length of the second (.21) and third 

 dorsal spines. The length of the snout (.09), or the distance from the 

 end of the snout to the orbit (.09), equals the long diameter of the eye 

 (.09), and half the length of the upper jaw (.18). The length of the 

 7iiaxillary (.16) equals twice the length of the caudal peduncle, and half 

 the length of the anal base (.32). The length of the mandible (.185) 

 equals half the length of the head, and is contained 5J times in the 

 length of the body. 



There are two obtuse spines on the snout, two above the posterior 

 l)arts of the orbits, and two on the vertex, the last four being provided 

 with short filaments. I can find none on the spines of the snout. There 

 are two minute, barbel-like filaments on the chin, and there is one short 

 cutaneous tag close to the end of each maxilla and on the membrane at 

 the upper angle of the gill-opening. The type is well preserved, but a 

 little stiffened by long immersion in very strong alcohol. 



The distance of the spinous dorsal from the snout (.30) equals 2^ times 

 the length of its first spine (.12). Its length of base (.23) equals the 

 greatest width of the head (.23). The second and third dorsal spines 

 are equal, their length (.21) being contained nearly 5 times in the length 

 of the body. The fourth dorsal spine is the longest (.22) ; its length is 

 contained 4.} times in the length of the body. The length of the fifth 

 dorsal spine (.20) is contained 5 times in the length of the body. The 

 la'st dorsal spine (.055) is shorter than the antecedent spine (.07) of the 

 second dorsal. The longest ray of the second dorsal (.175) is half as long 

 as the distance of the pectoral from the snout (.345); the last ray (.035) 

 is half as long as the antecedent spine. 



The distance of the anal from the snout (.59) is nearly twice that of 

 the spinous dorsal from the same i)oint. The length of the anal base 

 (.32) is twice that of the maxillary. The longest anal ray (.16) is twice 



