584 
Ariosoma brachyrhynchus new species 
Depth 2 to 2 l/6 in head, 10 l/2 to 12 7/8 to caudal base; 
head 5 l/5 to 6, 2 to 2 3/5 to vent, width 2 3/4 to 3 in its 
length; combined head and trunk 1 l/3 to 1 l/2 in tail to caudal 
base. Snout 5 to 5 7/8 in head; eye 3 2/5 to 6, little greater 
than snout in young to subequal with age, greater than interorbit¬ 
al; mouth cleft reaches l/2 to nearly opposite hind eye edge with 
age, length 2 9/l0 to 3 in head; lower jaw very slightly protrudes 
so only 2 or 3 rows of premaxillary teeth exposed when mandible 
closes; teeth all small, simple, conic, in narrow bands in jaws 
and short row on head of vomer; interorbital 4 3/4 to 6, with low 
median ridge. Gill opening 5 l/8 to 7 l/4, below pectoral origin. 
Lateral line axial, conspicuous, complete. 
Dorsal origin over first 2/5 to 4/5 of depressed pectoral, 
fin height 3 2/5 to 4 2/5 in head; anal fin height 5 3/4 to 7 l/4; 
caudal 6 l/2 to 6 2/3, pointed; pectoral 2 l/2 to 3. 
Brown, under surface of head whitish, trunk and tail also 
pale. Iris grayish. Inside mouth and gill opening pale. Fins 
pale brown. Vertical fins with narrow blackish border all around. 
Pectoral pale brown. 
Diagnosis, differs from Ariosoma obud in its much shorter 
and more obtuse muzzle. 
Type No. 
U. S. N. M. 
