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ICHTHYOLOGY 
this fin ; head three times and a-half in the first of these 
dimensions ; eye three times and eight-tenths in the length of 
the head. 
The snout is considerably produced, and is, up to the nos- 
tril, a little longer than the diameter of the eye ; the maxillary 
bone extends further than "the anterior edge of the eye ; the 
upper front part of the head is naked ; the cheeks have three 
series of scales ; the operculum is slightly bilobed behind, and 
has five series of scales ; the highest part of the body is at 
the insertion of the dorsal ; the scales are rather angulous on 
their edge, they number about forty-eight on the longitudinal 
line and nineteen on the transverse one ; the lateral line passes 
over the seventh. 
The dorsal is formed of nine spines and ten rays ; the first 
spine is very short, the second much longer than all the others, 
and equal in length to the distance from the anterior edge of 
theorbit to the end of the operculum ; the caudal is considerably 
longer than the head, it is very deeply forked, and formed of 
fifteen long rays with other short ones at the base ; the anal 
and the dorsal are received in a deep scaly sheath; it is formed of 
three spines and eight rays ; the first spine is very short, the 
second eight times longer, and the third nearly as long as the 
precedent, but not so thick ; this second spine is more slender 
than the second of the dorsal, and is less than two-thirds of 
its length ; the ventrals are rather large and inserted behind 
the pectorals, they are as long as the head, of sixteen rays ; 
they are at least as long as one-fourth of the total length to 
the extremity of the caudal. 
The colour is white and silvery ; the upper parts have a 
bluish tinge ; the dorsal and caudal have an obscure edge. 
The total length is over fourteen inches. 
NEOSUDIS. 
Body very elongate ; height eight and a-half times in the 
total length ; head six times and one-third in the same ; eye 
four and two-thirds in the head; body compressed, very elon- 
gate, sharp below ; head also compressed ; the lower jaw con- 
