SUB-CLASS T 



SELACHII 



31 



spines smooth, without posterior denticles 

 the Lithographic Stone (Upper 

 Jurassic) of Bavaria (C. falcifer, 

 Wagn., Fig. 56) and the Chalk 

 of England (so-called Drepane- 

 phoms canaliculars, Egert.). 

 Teeth from Lower and Middle 

 Eocene of England and Belgium. 

 Existing in Australian and other 

 seas. 



Nearly complete skeletons from 



Familv 2. 



Scylliidae. 

 and Henle. 



Miiller 



Fig. 57. 



Lower jaw of Recent Port Jackson Shark, ' 'estrcu 



Cuv. Australia. 



Dorse I fins without spines, the 

 (interior situated above or behind the 

 pelvic fins. Teeth small, numerous, 

 and pointed, sere rat series being 

 generally in function. Vertebrae 

 with eight stout radiating plates. 

 Upper Jurassic to Recent, but 

 fossils rare. 



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 

 Lithographic Stone, Bavaria. 



Scyllium, Cuv. (Thyellina, 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. Nearly 

 complete fishes from the Upper Cretaceous of Westphalia (>'. 

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

 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 each side of the upper edge of the caudal tin. 

 Probst') 1 " PU(aftel P- nmse h S m - Woodw., a small species from the Lithographic 



Stone of Eichstadt, Bavaria. Recent. 

 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 Cretaceous, 

 Mount Lebanon. 



Chiloscyllium, Mull, and Henle, and Gingly mo stoma, Mull, and Henle 

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



Family 3. Carchariidae. Miiller and Henle. 



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

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



Fi<;. 58. 



Scyllium distans, 

 Probst. Tooth, x 2. 

 Miocene (Molasse) ; 



