

196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 9 



the external opening of the rostral cavity, lies above and slightly before 

 anterior nostril of each side. A series of nine pores on each side of ventral 

 surface of lower jaw. Two small pores behind posterior edge of eye. 

 Three widely spaced pores along each side of dorsal mid-line of snout and 

 interorbital. 



Lateral line complete, origin on mid-line of nape midway between eye 

 and gill-opening. Descends abruptly to side of nape, thence bending 

 sharply backward and arching slightly over gill-chamber and pectoral 

 base and descending to mid-line of sides, continuing to tip of tail. Pores 

 in its length 132, 33 pores from origin to above vent, dorsal origin above 

 10th pore. From upper and lower edges of lateral line short, posteriorly 

 curved branches extend dorsally and ventrally. These branches occur 

 opposite one another at approximately the center of interspaces between 

 lateral line pores. Lying close to base of dorsal fin on each side and extend- 

 ing backward from a vertical through lower edge of pectoral base, a thin, 

 pale line extends posteriorly almost to tip of tail. This line, though smaller 

 and without external pores, is similar in appearance to lateral line and, 

 while its function is not understood, it may be associated with that system. 

 From its ventral edge numerous short branches curve backward and 

 downward. 



Maxillary teeth in a wide band of small, pointed, close-set teeth 

 anteriorly, narrowing laterally to two irregular rows. Maxillary teeth 

 closely united anteriorly to sides of the continuous premaxillary-vomerine 

 teeth. Premaxillary teeth slightly enlarged anteriorly, almost entirely 

 visible from directly below when mouth is tightly closed, and in slightly 

 constricted contact with the vomerine teeth. Vomerine teeth in an 

 elongate band of small, pointed, close-set teeth anteriorly, becoming 

 bluntly conical and widely spaced posteriorly. Mandibular teeth similar 

 to maxillary teeth, band narrowed to a single row laterally; not united 

 across symphysis of lower jaw. 



Color in alcohol brownish gray dorsally, becoming lighter ventrally 

 before vent. Caudal region uniformly colored. Lateral line lighter than 

 body color; dorsal branches dark, ventral branches pale. Dorsal fin body 

 color, becoming darker posteriorly, blackish at tip of tail. Anal fin similar 

 to dorsal. Pectoral fin colorless. Dorsal aspect of nape darker than body, 

 this color extending downward over gill-covers as a narrow, anteriorly 

 pointed crescent. Opercular area included with the crescent pale. Inter- 

 orbital dark, snout lighter. 



Rhynchocymba catalinensis may be distinguished from R. dubius by a 

 longer, more tapering vomerine band of teeth, narrower maxillary tooth 

 bands, dorsal fin inserted much closer to center of eye than to vent, longer 



