SUB-CLASS I 



SELACHII 



31 



spines smooth, without posterior denticles. 

 the Lithographie Stone (Upper 

 Jurassic) of Bavaria (C. falcifer, 

 Wagn., Fig. 56) and the Chalk 

 of England (so-called Drepane- 

 phorus canaliculatus, Egert.). 

 Teeth from Lower and Middle 

 Eocene of England and Belgium. 

 Existing in Australian and other 

 seas. 



Family 2. Scylliidae. Müller 

 and Henle. 



Dorsal fins without spines, the 

 anterior situated above or behind the 

 pelvic fins. Teeth small, numeivus, 

 and pointed, several series being 

 generally in function. Vertebrae 

 with eight stout radiating plates. 

 Upper Jurassic to Eecent, but 

 fossils rare. 



Nearly complete skeletons from 



Fig. 57. 



Lower jaw of Recent Port Jackson Shark, Cestracion 'pMUppi, 

 Cuv. Australia. 



Fig. 58. 



Scyllium dislans, 

 Probst. Tooth, x 2. 

 Miocene (Molasse) ; 



Palaeoscyllium, Wagn. Anterior dorsal fin opposite pelvic pair, and 

 posterior dorsal arising in advance of anal, which is small. P. formosum, 

 Wagn., and P. minus, Sm. Woodw., known by nearly complete fishes from 

 Lithographie Stone, Bavaria. 



Scyllium, Cuv. (Tht/ellina, Ag.), (Fig. 58). Origin of anal fin always in 



advance of that of posterior dorsal fin. Teeth delicate with a high middle 



cusp and generally one or two small lateral denticles. Xearly 



(^ complete fishes from the Upper Cretaeeous of Westphalia (S. 



jÄlq ^ßU angustum, Ag. sp.) and Mount Lebanon (S. elongatum, Davis 



||||r Wm sp.) ; also numerous detached teeth from the Chalk and 



Tertiaries (Fig. 58). Recent. 



Pristiurus, Bonap. As Scyllium, but with a series of small 

 flat spines on eaeh side of the upper edge of the caudal fin. 

 ProbstS"^*^"^*^^^^ ^' ^(^^^^h Sm. Woodw., a small species from the Lithographie 

 Stone of Eichstädt, Bavaria. Eecent. 

 Mesiteia, Kramberger. Snout produced. Teeth minute and tricuspid. 

 Anterior dorsal fin above or behind pelvic pair ; anal fin much extended. 

 Tail excessively elongated, without dermal scutes or spines. Shagreen absent 

 or very delicate, and lateral line supported by a series of calcified rings as in 

 Chimaeroids. M. emiliae, Kramberger, from Upper Eocene, Monte Bolca, 

 near Verona ; M. sahel-almae, Pict. and Humb. sp., from Upper Cretaeeous, 

 Mount Lebanon. 



Chiloscyllium, Müll, and Henle, and Ginglymo Stoma, Müll, and Henle 

 {Plicodus, Winkler ; Acrodobatis, Leidy). Tertiary and Recent. 



Family 3. Oarchariidae. Müller and Henle. 



Dorsal fins without spines, the anterior situated opposite to the space between the 

 pectoral and pelvic fins. Teeth hollow, pointed and triangulär, with smooth or 



