VI Systematic Arrangement. 



CLASS PISCES Continued. Page. 



SUBCLASS SELACHII-Continued. 

 ORDER DIPLOSPONDYLI Continued. 



Family Hexanchidce 17 



Genus Xotorhyncbus, Ayres 17 



maculatus, Ayres 17 



Genus Hexanchus, Rafinesque 18 



corinus, Jordan & Gilbert . . . 18 



griseus (Gmelin) 19 



ORDER ASTEROSPONDYLI 19 



SUBORDER PROARTHBI 19 



Family Heterodontidce 19 



Genus Gyropleurodus, Gill 20 



francisci (Girard) 20 



quoyi(Freminville). 21 



SUBORDER GALEI 21 



Family Scylliorhinidce 22 



Genus Scylliorhinus, Blainville 22 



profundornm, Goode & Bean 22 



Genus Catulus, Smith 23 



Subgenus Catulus 24 



xaniurus, Gilbert 24 



brunneus, Gilbert 24 



cephalus, Gilbert 24 



retifer (Garman ) 25 



Subgenus Cephaloscyllium, Gill 25 



uter, Jordan & Gilbert 25 



Family Ginglymostomidce 25 



Genus Ginglyrnostoma, Miiller & Henle 26 



cirratum (Graelin) 26 



Family Pseudotriakidce 26 



Genus Pseudotriakis, Capello 27 



microdon, Capello 27 



Family Galeidce 27 



Genus Mustelus, Cuvier 28 



lunulatus, Jordan & Gilbert 28 



canis (Mitchill) 29 



Genus Galeus, Rafinesque 29 



dorsalis ( Gill) - 30 



californicus (Gill) 30 



Genus Rhinotriacis, Gill 30 



henlei, Gill 31 



Genus Triakis, Miiller & Henle 31 



semifasciatum, Girard 31 



Genus Galeorhinus, Blainville 31 



zyopterus, Jordan & Gilbert '-.-- 32 



Genus Galeocerdo, Miiller <fc Henle 32 



tigrinus, Miiller & Henle 32 



Genus Prionace, Cantor 33 



glauca (Linnaeus) 33 



Genus Carcharhinus, Blainville 33 



Subgenus Platypodon, Gill 35 



obscurus (Le Sueur) 35 



platyrhynchus (Gilbert) 36 



falciformis (Bibron) 36 



acronotus (Poey ) 36 



perezi(Poey) 36 



