NO. 7 wade: eastern pacific apodal fishes 191 



anteriorly and closely approaching the vomerine teeth at the head of the 

 shaft of the vomer. Vomerine teeth separated from premaxillary teeth by 

 a narrow semicircular interspace. Vomerine band an elongate triangle; 

 the teeth small, pointed, close set anteriorly, narrowing to a single row of 

 bluntly conical teeth posteriorly. Premaxillary teeth arranged in a semi- 

 circular patch around tip of upper jaw, and partly exposed when mouth 

 is tightly closed. 



Color in alcohol ochraceous buff, the ventral surface lighter. Basal 

 two-thirds of dorsal and anal fins pale, distal third of fins brown, becom- 

 ing more intense posteriorly. Head body color, shaded with darker on 

 interorbital and dorsal aspect of snout. 



Genus RHYNGHOGYMBA Jordan and Hubbs 



Rhynchocyniba Jordan and Hubbs, 1925, pp. 192 and 195 (type by 

 original designation Leptocephalus nystromi Jordan and Snyder). 

 Rhynchoconger Jordan and Hubbs, 1925, pp. 192 and 196 (type by 

 original designation Leptocephalus ectenurus Jordan and Richard- 

 son). 

 Pseudoxenomystax Breder, 1927, p. 6 (type by original designation 

 P. dubius Breder). 

 Body elongate, head and trunk subcylindrical, becoming compressed 

 posteriorly on tail. Tail much longer than head and trunk. Head large, 

 subequal to trunk. Dorsal origin behind pectoral base, confluent with anal 

 around tip of tail. Pectoral fins well developed, ventral fins absent. 

 Snout projecting moderately beyond premaxillary teeth. Anterior nostrils 

 tubular, directed downward, placed near tip of snout, close to lateral 

 edge of lower surface. Posterior nostrils with a thickened rim, placed 

 before eye at its mid-depth. 



Maxillaiy, premaxillary, and vomerine teeth closely united at the tip 

 of the upper jaw. Premaxillary teeth largely exposed when mouth is 

 tightly closed. Vomerine teeth in an elongate band of small, pointed, 

 close-set teeth anteriorly, becoming more widely spaced and conical 

 posteriorly. Maxillary and mandibular teeth in narrow bands of small, 

 pointed, close-set teeth. Labial canal present, its inferior edge with 

 three pointed, bony processes extending downward into oral edge of upper 

 lip. Two enlarged pores between anterior nostrils. 



Although it is impossible at the present time to deteiTnine the exact 

 generic relationships of the genus Rhynchocymba, one can indicate its 

 probable affinities. The genus Rhynchocyniba was erected by Jordan and 



