SUB-CLASS I 



SELACHII 



39 



Fig. 



Callo'prlstodus pei 

 tinatus, Ag. sp. 

 Measures : Scotlaiid 



Goal 



of other species (so-called Clwiaxodus, etc.) from Upper and Lower Carbon i- 

 ferous of England, Scotland, Ireland, and 

 North America. 



Fissodus, St. John and Worthen. Car- 

 boniferous Limestone ; North America 

 and Scotland. 



Glossodus, M'Coy ; MesolopJiodus, Sm. 

 Woodw. Carboniferous Limestone; 



Ireland. PolyrUlzodus magnus, M'Coy. Tooth in froiit 



Polyrhizodus, M'Coy (JJactyloduS, vlew (^l), aiul transverse section (i?), 1/2 «at. slze. 



AT 1 \ /-n- r-rw\ m ^1 1 ^ -i.!- Carboniferous T.iniestone; Arinagh(after M'Coy). 



Newb.), (Flg. 77). Teeth robust, with a & v .r/ 



tumid crown tapering to a transverse cutting edge, and the root much sub- 



divided. P. magnus, M'Coy, and other species from the Car- 



**fHH|^ boniferous Limestone of 

 J^^\ Ireland, England, Russia, 



^ _, and North America. 



Vir: TS 



Ctenopiychius, Ag. 

 (Ctenopetalus, Harpacodus, 

 Petalodopsis, Davis ; Ser- 

 ratodus, de Koninck. Teeth small, 

 antero-posteriorly compressed, with sharp 

 serrated edge. Coal Measures and Car- 

 boniferous Limestone ; England, Scot- 

 land, Ireland, Belgium, and North 

 America. 



Callopristodus, Traquair (Fig. 78). 

 As Ctenoptychius, but root subdivided. 

 C. peäinatus, Ag. sp., from the Coal 

 Measures of England and Lower Car- 

 boniferous of Scotland, also from Coal 

 Measures of Nova Scotia. 



Peripristis, St. John (Pristodus, Davis). 

 Lower Carboniferous; Creat Britain and 

 U.S.A. 



Family 4. Squatinidae. M. and H. 

 Aiigel-fishes or Monk-fishes. 



Trunk broad and depressed. Pectoral 

 fins large, separated hy a cleft from the 

 head, so that the branchial openings are 

 still direded laterally. Teeth pointed and 

 conicol, without lateral dentides. Two 

 dorsal fins on the tail, without spines. Skin 

 covered with small placoid scales. Jurassic 

 to Eecent. 



The Single genus Squatina, Aldro- 

 vandi {PJiina, Klein ; Thaumas, Münst. ; 

 Phorcynis, Thioll. ; Sealdia, Le Hon; Trigonodus, Winkler), (Figs. 79-81), first 

 appears in the Upper Jurassic and survives in the existing fauna. Complete 

 skeletons of S. alifera, Münst. sp. ; S. speciosa, Meyer ; and *S^. acanthoderma, 



Fig. 79. 



Siinatina alifera, Münst. sp. ( = Sip(aHna ncantho- 

 (Icrma, Fraas). Upper Jurassic ; Eichstädt, Bavaria. 

 (Original in Palaeontological Museum, Munich.) 



