520 Storer on the 
M. Massachusettensis. Nobis. The Massachusetts 
File Fish. 
The only specimen I have seen was sent me by 
Dr. Yale, as having been found in Massachusetts 
Bay. 
Its entire length is four inches ; depth across, from 
the base of the dorsal spine, two inches; depth at 
the base of the tail, three lines. Body oblong, 
very much compressed; surface granulated, and 
exhibiting numerous minute white cilia suspended 
from its sides. Color, a yellowish brown, varie- 
gated over its entire extent with brownish markings 
and blotches, which are less obvious beneath. Length 
of the head, one inch; jaws of equal length ; teeth, 
stout. Eyes circular, one fourth of an inch in di- 
ameter; above, and just back of the eye, a strong, 
granulated, curved spine, half an inch long, is situ- 
ated, with small sharp spines upon its posterior lat- 
eral edges, pointing downwards and backwards. 
The Dorsal fin commences three quarters of an 
inch back of the spine; composed of colorless rays; 
roughened at their bases. The pectorals also, are 
colorless, and rounded when expanded. 
The Pelvic bone projects, is quite moveable, and 
is connected by a dewlap to the abdomen. 
The Anal fin is situated just back of the dorsal ; 
the base of its rays are granulated like those of the 
dorsal ; and it is of the same form as that fin. 
The Caudal fin is darker colored than the other fins. 
"ONE am are: D. 34; P. 12: A. 34; C. 12 
