Dr. A. Giinther on Central-American Fishes. 331 
teeth at all in the jaws, except that in one specimen the band of 
papillae passes into a series of fine moveable teeth anteriorly in the 
upper jaw. The head and especially the body and tail are com- 
pressed ; the greatest depth of the body nearly equals the length of 
the head, and is contained four times and a half in the total length. 
The upper anterior profile is nearly straight, obliquely descending. 
The interorbital space is convex, one-half of the length of the head, 
and scaly, whilst the parts before the orbits are naked. The anterior 
portion of the upper lip is extremely thick, conically protruding, and 
nearly as long as the remainder of the snout. A narrow band of 
soft papillz occupies the lower parts of the lips anteriorly and 
M. proboscideus. 
laterally ; the papillee are arranged in oblique series, having a pave- 
ment-like appearance. The lower jaws are rather narrow, and the 
cleft of the mouth is much longer than broad. The maxillary is 
entirely hidden by the przeorbital, which has the extremity truncated 
and minutely serrated. The eye is much shorter than the snout, and 
in the present specimen, which apparently is a young one, one-fourth 
of the length of the head. There are twenty-three scales between 
the snout and the spinous dorsal fin. The latter commences somewhat 
nearer to the base of the caudal than to the end of the snout: the 
soft dorsal and the anal have series of small scales between the rays ; 
the former is higher than the spinous dorsal, and commences above 
the middle of the anal fin. Caudal emarginate ; the anal is rather 
higher than long, as high as the soft dorsal. The pectoral is inserted 
above the middle of the depth of the body, and its length is four-fifths 
of that of the head. 
Silvery, upper parts greenish ; dark stripes along the series of scales. 
MyxvS HARENGUS. 
D.4|4. A. ZL. lat. 38. 
A single series of small fixed teeth in the upper jaw, none in the 
lower or on the vomer; lips thin. Preeorbital serrated anteriorly 
and inferiorly. Anterior dorsal spines of moderate length, half as 
long as the head. 
Head and body are compressed, the greatest depth being about 
one-fifth of the total. The cleft of the mouth is rather broader than 
deep, and does not extend to the anterior margin of the orbit. Sides 
and belly bright silvery ; back green. 
