518 
Genus Syn aphobranchus Johnson 
Synaphohranchus JOHNSON, Proc. Zool, Soc. London, 1862, p. 
169. Type Syn aphohranchus kaupll JOHNSON, raonotypic. 
HistiObranchus GILL, Proc. U. S. ^at. Mus., vol. , 1883, 
p. 255. Type HI st iobra nchus Inf em ails GILL, monotypic. 
Head long, pointed. Mouth very long. Jaws about equal. 
Maxillaries lateral. Cardiform teeth sharp, broad band in each 
jaw, become uniserial forward, upper inner and lower outer ones 
somewhat enlarged. Vomerine teeth in narrow band anteriorly. 
Tongue long, not free. Nostrils large, anterior with short tube, 
posterior close before eye. Gill openings inferior, horizontal, 
convergent forward, somewhat confluent at surface but separtiuod 
by considerable isthmus within. Branchiostegals peculiar, mod¬ 
erate, attached to sides of compressed ceratohyal and epihyal, 
slender, abbreviated, moderately bowed, not curveu, up aoove opercj.©. 
Scales linear, placed at right angles. Dorsal low, begins behind 
vent. Anal rather high, rays slander, branched, not embedded in 
skin. Vent near first fourth of body. 
