SUB-CLASS I 



SELACHII 



39 



of other species (so-called Climaxodus, etc.) from Upper and Lower Carboni- 

 ferous of England, Scotland, Ireland, and 

 North America. 



Fissodus, St. John and Worthen. Car- 

 boniferous Limestone ; North America 

 and Scotland. 



Glossodus, M'Coy ; Mesolophodus, Sm. 

 "Woodw. Carboniferous Limestone ; 

 Ireland. 



KiG. 77 

 Polyrhizodus luagnus, M'Coy. 



„ , --„- Tooth in front 

 Poh/rhizoduS, M'Coy (DactyloduS, view (^), and transverse section ^5), 1/2 nat. size. 

 TIT- 1 X /T-i. ^^\ m 1 1 . -ii Carboniferous Limestone ; Armagh (after 



Newb.), (Fig. 77). Teeth robust, with a 



ifter irCoy). 



Teeth robust, with 



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

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

 boniferous Limestone of 

 Ireland, England, Russia, 

 and North America. 

 Ctenoptychius, Ag. 

 «)!«{»«; Ag.sp. Coal (Ctenopetalus.Harpacodus, 



Measures; Scotland. V. , 7 7 • -r-. - n 



retcuodopsis, Davis ; o^r- 

 ratodits, de Koninck. Teeth small, 

 antero-posteriorly compressed, wath sharp 

 serrated edge. Coal Measures and Car- 

 boniferous Limestone ; England, Scot- 

 land, Ireland, Belgium, and North 

 America. 



Callojyristodus, Traquair (Fig. 78). 

 As Ctenopty chins, but root subdivided. 

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

 Measures of England and LoAver Car- 

 boniferous of Scotland, also from Coal 

 Measures of Nova Scotia. 



Peripristis, St. John (Pristodus, Davis). 

 Lower Carboniferous ; Great Britain and 

 U.S.A. 



Family 4. Squatinidae. M. and H. 

 Angel-fishes or Monk-fishes. 



' Trunk broad and depressed. Pectoral 

 fins large, separated by a cleft from the 

 head, so that the branchicd openings are 

 still directed latercdly. Teeth pointed and 

 conical, without • lateral denticles. Two 

 dorsal fins on the tail, without spines. Skin 

 covered with small pilacoid scales. Jurassic 

 to Recent. 



The single genus SquaJina, Aldro- 

 vandi (PJiina, Klein ; Thaumas, Miinst. ; 

 Phorcynis, Thioll. ; Scaldia, Le Hon; Trigonochis, ^Y inkier), (Figs. 79-81), first 

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

 skeletons of >S^. alifera, Miinst. sp. ; S. speciosa, Meyer ; and S. acanthoderma. 



Fig. 79. 



Squdtina alifera, Miinst. sp. ( = Sijuatina acaxtho- 

 derma, Praas). Upper Jurassic ; Elclistadt, Bavaria. 

 (Original in Palaeontologlcal Museum, Munich.) 



