PISODONTOPHIS PENINSUL.Ti;. 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 tlie origin of the anal 

 fin, which latter is two and one half times the length of the head. Head 

 subconical, crown slightly c:)nvex iu 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, sejiarated from one another by a space equal to the 

 length of the orbit. 



Eud 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 peninsulae. 



Calhchelys peninsula; Gilb., 1891, P. U. S. Mils., 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 fiftli as 



