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F'ishes of Massachusetts. 325 
The Pectorals arise beneath the membrane of the 
branchie, as it is connected with the body: their 
length and half their height rounded. 
The Anal fin arises upon the anterior half of 
body, and is similar in its form and the character of 
its rays and their enveloping membrane, to the dor- 
fin. 
The Caudal fin appears almost like the prolonga- 
tion of the dorsal and anal fins. It is rounded at its 
extremity. 
The fin rays are as follows: B.7; D. 77; P. 
13; A. 50; C. 19. 
The flesh being removed from the smallest of 
the three specimens above spoken of, the following 
appearances are presented. The longitudinal ridges 
upon top of head; the suborbitar, inferior maxillary 
and preopercular bones, with deep excavations or 
cavities. The angles of gill-covers quite acute, as 
also those of scapule ; humeral spine very promi- 
nent. A single row of teeth, in jaws; on sides, 
double, in front; those in front, much smaller and 
straight ; those behind, recurved. Number of ver- 
tebre, eighty-nine. 
My generic name is derived from zgvazos, con- 
cealed—and «zav9007c, spine. 
GasrEeRosTEUs. Cuv. 
Generic characters. Body without scales, more or 
less plated on the sides: one dorsal fin, with five 
spines before it: ventral fin with one strong spine. 
