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year (November, December, January, and rebruaiy). They are 
not used for food, and the fishermen are in the habit of throwing 
them away whenever they catch them. It is probably due to 
this circumstance that I have yet only been able to obtain three 
of these sorts. They are all kno’wn under the name of Leather 
JacTcets. 
MONACANTHUS PEEONII. 
Monacanthus Peronii, Hollard, Ann. Sc. Nat., 1851, vol. xi., 
p. 356, pi. 13, fig. 4. 
— Gunther, Catal., viii.,p. 249. 
This sort enters in Dr. Gunther’s division, characterized by 
“ anal fin with less than forty rays ; dorsal spine with four series 
of barbels, the edges being equidistant, and armed with barbs.” 
The upper profile is concave in front of the dorsal spine, and con- 
vex behind it ; the central profile is considerably distended. 
The body appears entirely granulated ; these granulations are 
formed of minute tubercles ; towards the tail and near the anus 
they take a more spinous form. The dorsal spine is inserted over 
the centre of the eye ; its length is equal to one and a-half the 
transverse diameter of the orbit ; it is straight and even a little 
curved outwards near its end ; the barbs that extend on its 
edges are strong, particularly the external ones ; the second ray is 
contained four times in the length of the spine. The dorsal is 
formed of thirty-three rays, the caudal of twelve, the anal of 
thirty-two, and the pectorals of thirteen. The ventral spine is 
small, fixed, and armed with five or six rather strong spinelets. 
The colour is of a dark brown, the back much lighter, and 
of a dirty yellow on the belly ; the lower parts are covered 
with very irregular brown spots ; the dorsal and anal have 
an orange tinge. 
Only seen one in April ; length six and a-half inches. 
MONACANTHUS UOESXEEI. 
The anterior upper profile, in front of the dorsal fin, is concave, 
and the posterior one convex ; the general form is elongated,- 
being contained two and one-third t.mes in the total length ; 
the snout from its extremity to the anterior edge of the orbit is 
contained four and one-third times in the same length ; the 
