770 
Muraeniohthy s retropinnis new species 
Depth 29 1/2 to 33# head 9 2/3 to 9 3/4# 3 1/2 to vent* width 4 2/3 
to 5 1/4 its length; combined head and trunk from 1/5 greater than rest 
of body to 1 3/4 in tail* Snout 5 to 5 3/4 in head; eye 12 to I5f 1 7/8 
to 2 in snout* 1 2/5 to 1 1/2 in interorbital; mouth cleft reaches 1 1/2 
to eye diameters behind eye* length 3 1/10 to 3 1/2 in head; teeth small* 
simple* pointed in jaws* uniserial: 2 short rows of fine teeth at front of 
vomer; interorbital 7 1/4 to 7 2/5# convex* Gill opening about equals eye* 
Lateral line distinct* complete. 
Dorsal begins behind vent space equal to 1 2/5 to 1 1/2 head lengths; 
vertical fins as very low feeble confluent fold* No pectoral. 
Uniform brown. Iris gray. 
Diagnosis . Known chiefly by the posterior insertion of its dorsal 
fin* this over a head length behind that of anal* Other characters are its 
uniserial jaw teeth, eye postmedian over the mouth cleft and pointed snout* 
It differs from Muraenlchthv^ schultzil chiefly in its more backward dor¬ 
sal origin. 
Type No* 
U. S. N. M. 
