PISODONTOPHIS PENINSULZ. 311 
Ophichthys biserialis sp. n. 
Slender and elongate, depth one sixteenth of the entire length, tail one 
and three fifths times the distance from the snout to the origin of the anal 
fin, which latter is two and one half times the length of the head. Head 
subconical, crown slightly convex in all directions. Snout rather narrow, 
pointed, nearly one fifth as long as the head, projecting beyond the lower 
jaw about two thirds of the length of the eye, sharp-edged at the sides, 
flexible at the end. Eye large, two thirds as long as the snout, one eighth 
of the length of the head; pupil elongate, horizontal. Mouth wide, three 
sevenths as long as the head, extending one ocular diameter backward ot 
the orbit. Tongue well developed. Teeth small, subconical, in two series 
on the jaws and the vomer, longer forward, gradually decreasing in size 
backward, four or five large ones forward of the lower jaw between the 
anterior nostrils, vomerine series ending below the forward portion of the 
eye. Anterior nostrils tubular, pendant above the ends of the lower jaws ; 
posterior concealed by a fold on the lip, near the eye. Gill openings small, 
not as wide as the eye, separated from one another by a space equal to the 
length of the orbit. 
End of the tail extending beyond the dorsal and anal, by about one 
orbital length, finless. Dorsal and anal low; dorsal origin one length of the 
orbit backward from the gill opening, above the middle of the pectoral ; anal 
origin three and three fourths lengths of the head from the end of the snout. 
Pectorals small, as long as the mouth, pointed. Lateral line distinct. 
Light reddish brown, with a series of twenty-six elliptical or ovate spots 
of brown, larger than the eye, above the lateral line behind the head ; head 
with a dozen or more rounded smaller spots of brown, smaller toward the 
snout; lower half of the head white; lower half of body plain; fins 
whitish. 
Hab. Chatham Island, Galapagos. Probably not descending far from 
the surface. 
Pisodontophis peninsule. 
Callechelys peninsule Gilb., 1891, P. U. S. Mus., 548, 
Elongate, slender, slightly compressed forward, more so on the tail; 
depth one twenty-fifth, length of the head two twenty-fifths, and length of 
the body chamber two fifths of the total length. Head small, one fifth as 
