22 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



dermal flap ; dorsal and anal fin folds rather broad, continued around 

 the tail, the anal fold continued forward to gonadal pouch without 

 diminishing perceptibly in width, both folds with numerous not 

 accurately countable rudimentary rays; vent situated about twice as 

 far from gonadal pouch as from tip of tail; portion of body behind 

 gonadal pouch, or behind origin of anal, 3.5 to 3.8 in total length. 



The description is based on six specimens, 37 to 64 mm. long, 

 dredged on bottom with dead shells at Don Martin Island by the 

 Mission, and one specimen, 41 mm. long, taken at Chincha Island by 

 W. L. Schmitt. These specimens were compared with others from 

 Valparaiso, Chile (U.S.N.M. No. 70716), and from the Galapagos 

 Islands (U.S.N.M. No. 119816), with which they seem to be identical. 

 They were also compared with several lots of specimens from Cali- 

 fornia and from Panama Bay, from which they differ in the more 

 numerous myomeres, the more anterior position of the vent, and 

 the larger rostral flap. 



Range. — Coasts of Peru and Chile, at least as far south as Valparaiso, 

 and the Galapagos Islands. 



Family HETERODONTIDAE: Bullhead Sharks 



Body short, heavy anteriorly, tapering strongly posteriorly; head 

 short, broad; eye lateral, small, no nictitating membrane, protected 

 above by a very heavy ridge ; spiracle small, below posterior part of eye; 

 mouth near rim of snout, with lobed lips; teeth anteriorly more or less 

 tricuspid, ridged grinders posteriorly; nostrils connected with the 

 mouth by grooves; two dorsal fuis, each anteriorly with a strong spine; 

 anal smaU, behind second dorsal. 



Genus HETERODONTUS Blainville, 1816 



The characters of the genus are sufficiently mdicated in the family 

 description. A single species is known from Peru. 



HETERODONTUS QUOYI (FreminvUle) 



Gato; SuKo 

 Figure 4 



Cesiracion quoyi Fr^minville, 1840, p. 2, pi., Galdpagos Islands (original 



description). 

 Cesiracion pantherinus Valenciennes, 1855, p. 350, pi. 10, fig. 2, Galapagos 



Islands (original description). 

 Gyropleurodus peruanus Evermann and Radcliffe, 1917, p. 2, pi. 1, fig. 1, Lobos 



de Tierra, Peru (original description).- — Nichols and Murphy, 1922, p. 504, 



Lobos de Afuera Island, Peru. 

 Heterodontus peruanus Fowler, 1941a, p. 220, fig. 1 (references; range). 

 Heterodontus quoyi Beebe and Tee-Van, 1941, p. 117, fig. 30 (range; field 



characters; size; description; references; discussion in which conclusion is 



reached that peruanus is a synonym of quoyi) . 



