26 



PISCES 



Bavaria, and N. gracilis, Davis, by a smaller skeleton from the Upper Cretaceous 

 of Sahel Alma, Mount Lebanon. Detached teeth from 

 the Oxford Clay of England and Corallian of Wiirtem- 

 berg ; from the Chalk of England (N. microdon, Ag.) 

 and the Cretaceous of New Zealand (JV. dentatus, Sm. 

 Woodw.) ; and numerous species from Tertiary forma- 

 tions (e.g. N. primigenius, Ag., Fig. 45). 



Chlamydoselache, Garman. Teeth with broad, back- 



wardly extended base, and the crown consisting of three 



slender, curved, subconical cusps, which are separated 



by a pair of rudimentary denticles. Wide distribution 



Isolated teeth in Pliocene of Tuscany (C lawleyi, 



Fig. 45. 



Notidaniis primigenius, Ag. 

 Lower tooth. Oligocene; 

 Welnlieim, Hesse Darmstadt. 

 Natural size. 



in existing 

 Davis). 



deep 



sea. 



Sub-Order B. CYCLOSPONDYLI. Hasse. 



Vertebral centra in form of simple constricted cylinders pierced by the notocliord. 

 Teeth numerous, triangular, and acuminate, simple or %vith small lateral cusps. Rare 

 in the fossil state ; Upper Cretaceous to Eecent. 



Family 1. Spinacidae. Miiller and Henle. Spiny dog -fishes. 



Body fusiform to trihedral, somewhat depressed. Mouth gently arched; snout 

 obtuse. Gill clefts small, lateral ; sptiracles large, behind the eye. Pectoral fins not 

 notched at their origin and not produced fonvards ; the ttuo dorsal fins often armed 

 with a spine ; anal fin absent. Upper Cretaceous to Eecent. 



Centrophorus, Miiller and Henle (Fig. 46). Dorsal fin spines present. 

 Upper teeth erect, triangular, or narrow lanceolate, with a single cusp ; lower 



teeth triangular 

 and compressed, 

 with the apex 

 much turned aside. 

 Upper Cretaceous, 

 Sahel Alma, Mount 

 Lebanon (Spinax 



I'm. 40. 



Vertebra (centi-al double-coue) 

 of Centrophorus. Upper Cre- 

 taceous ;;; Maastricht (after 

 Hasse). 



Sci/niH Hs tria7igitlus, 

 Probst. Tooth, x 2. . -n- , \ 



Miocene (Molasse) ; fnmaevUS, rictet) 



Eecent. 



Baltrinseii 

 Probst.) 



(after 



Fic. 47. 



Aiaiitliiits radically, 

 Probst. Tooth, x L'. 

 Miocene (Molasse) ; 

 IBaltringen, Wirrtem- 

 beig (after Probst.) 



Acanthias, Eisso 



{Centrophoroides, Davis), (Fig. 47). As Centrophorus, but teeth in upper jaw 

 as in lower jaw. Upper Cretaceous, Sahel Alma, Mount Lebanon {Centro- 

 phoroides lat ideas, Davis). Tertiary {A. radicans, Probst) and Eecent. 



Cenfrina, Cuv. Pliocene and Eecent. 



Scymiius, Cuv. (Fig. 48). Xo dorsal fin spines. Upper teeth small, 

 pointed ; lower teeth much larger, broad and compressed, triangular, erect or 

 only slightly inclined laterally. Eocene to Eecent. 



Echinorhinus, Blainv. (Goniodus, Ag.) Pliocene and Eecent. 



Gruiullage des Banes uiid der Entwickeluug ihrer Wirbelsaule. Jena, 1879, with AppendLv, 188.'). 

 — Mailer, J., aud Henle, J., Systematische Beschreibung der Plagiostomeu. Berliu, 1841. — Jaekel, 

 O., Die eocanen Selachier vein Monte Bolca. Berlin, lS94.—Noetliiiff, F., Die Fauna des samlan- 

 disclien Tertiiirs (Abhandl. geol. Specialk. Preusseu, vol. VI. pt. 3), 1885. — Probst. Beitrage zur 

 Kenntniss der fossilen Fische aus der Molasse von Baltringen (Wiirttemb. naturw. Jahresh.), 1874, 

 1877, 1878, and 1882. 



