78 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 9 



and attached by their inner surfaces to the underside of the snout. Poste- 

 rior nostrils under the edge of the upper h'p, lying entirely within the 

 mouth and covered by a flap of skin, which must be lifted before the 

 rounded pore is visible. Gill openings wide apart, vertical, and low on 

 the side. Isthmus equal in width to the height of the gill opening. Just 

 inside the edge of the gill opening there is a dermal fold of skin, forming 

 what first appears to be another opening. Gular region not particularly 

 swollen, ventrally with many longitudinal folds. Jugostegalia not evident 

 externally. 



Eye small, 5 to 6 in snout, 25 to 27 in head ; much closer to angle of 

 jaws than to tip of snout and only faintly visible under the skin. Snout 

 projecting beyond end of lower jaw for a distance equal to width of the 

 isthmus, its ventral surface swollen so that the mouth is included behind 

 it. Snout 4.5 to 5 in head, cleft of mouth equal to snout. Head small, 

 17.26 to 17.68 in total length and 11.7 to 12.4 in head and trunk; its 

 point blunt and rounded. All teeth uniserial. Maxillary teeth not follow- 

 ing the curve of the jaws, but running in a straight line from their poste- 

 rior insertion to where the anterior teeth meet at the head of the vomerine 

 shaft. One slightly enlarged tooth at the symphysis of the two rows, all 

 teeth pointed, small and close set. Vomerine teeth in a single row of about 

 five teeth, the first largest, becoming smaller posteriorly. Posterior nos- 

 trils entirely outside the row of teeth. Premaxillary teeth not in a row 

 around the tip of the snout ; one large tooth lying under the median edge 

 of each of the papillalike folds of skin between the anterior nostrils, a 

 smaller tooth lying just posterior to each of the anterior teeth. Mandibu- 

 lar teeth in a single series, small and close set posteriorly, becoming larger, 

 caninelike, and more widely spaced anteriorly. The tips of the anterior 

 two mandibular teeth of each side fit into small pores in the roof of the 

 mouth. 



Color whitish, no markings or pattern of any kind. Under the micro- 

 scope, small pin points of dark dots are visible, most abundantly placed 

 along the mid-line of the side. 



POGONOPHIS, new genus 



Genotype. — Pogonophis fossatus, new species 



Dorsal and anal fins rather well developed, the former inserted a 

 short distance behind the gill openings, becoming more elevated posteri- 

 orly, both the dorsal and anal in a groove near the tip of tail, as is com- 



