. Sharks of the Famili/ CesiYUc'ioniids^. 495 



3. Gi/ropleurodiis galeatus. 



C'estracion (jaleatus, Giinth. Cat. Fish. viii. p, 416 (1870). 

 Jleterodoittits (/alcatus, Macleay & Macleay, Proc. Linn. Soc. N. S. 

 Wales, iii. 1878, p. 313, pi. xxv. 



Supraorbital ridges very strong, directed obliquely out- 

 wards. Origin of first dorsal above the posterior end of the 

 base of pectoral. Interorbital region and back in front of 

 dorsal fin blackish; a broad blackish bar below the eye; 

 back with some dark transverse bars, one at the base of each 

 dorsal fin most prominent. 



Ilah. New South AVales. 



In the Britisii ^Museum four specimens, 135 to 750 mm. in 

 total length, including the type of the species. 



2. Cestracion. 



Heterodonius (non Heterodon, Palisot de BeauvoisJ, Blainville, Nohv. 



IJuU. Sc. 1.^10, p. IL>1. 

 Cestracion, Cuv. liegne Anini. ii. p. 129 (1817). 



Anterior teeth cuspidate, sometimes unicuspid in the adult; 

 lateral teeth considerably enlarged, not keeled in the adult; 

 rami of the jaws meeting in long symphyses, so that the 

 anterior enlarged lateral teeth are near to those of the other 

 side ; supraorbital ridges gradually decreasing in height 

 posteriorly. 



Four species. 



Synopsis of the Species. 



I. Supraorbital ridges moderate, ending above first gill-opening ; dorsal 



fins with free edges slightly concave posteriorly; interorbital 

 region crossed by a single dark bar. 



Back with a nearly coutiniious blackish longitudinal 



band 1. phWippi. 



Jiack with dark cross-bars, alternately broad and narrow. 2. juponicus. 



II. Supraorbital ridges low, ending in advance of first gill-opening; 



dorsal iins with free edges more deeply concave posteriorly ; inter- 

 orbital region crossed by a pair of dark bars. 



Extreme width of the pair of interorbital bars (from 

 the anterior edge of the first to the posterior edge 

 of the second) much greater than the diameter of 

 eye 3. zchru. 



I'lxtreme width of the pair of interorbital bars equal to 



the diameter of eye 4. amhoiiunsis. 



1. Cestracion phiUij>pi. 



Squalns phillippi, Si'hnoid. Bloch's Syst. Ichth. p. 134 (1801). 

 llcterodontus phillippi, Blainv. Nouv. Bull. Sc. 181(), p. 121 ; Dumoril, 



Klusmobr. p. 424 (181)5); Macleay v'v; Macleay, I'roc. Linu. Soc. N. 



S. Wales, iii. 1S7S, pis. .\.\ii.-.\xiv. 



