94 



PISCES 



minute. L. hronni, Ag., and other comparatively small species in the Upper 

 Lias of England, France, and Germany. L. dubius, Blv. sp., L. sprattiformis, 

 Ag. (Fig. 170), and other species in the Upper Jurassic (Lithographic Stone) 



Head of Leptolepis knorri, Ag. Upper 

 Jurassic ; Kellieira. Reduced. 



Fig. 170. 



Leptolepis sprattiformis, Ag. Upper Jurassic ; Eichstadt, 

 Bavaria. Nat. size. 



of Bavaria and France ; also from the English Purbeck Beds, the Lower 

 Cretaceous of the Isle of Lesina, Dalmatia, and the Wianamatta Foi'mation of 

 New South Wales. Fragments from King Charles Land, Spitzbergen. 



Thrissops, Ag. Sometimes attaining rather large size. The short dorsal fin 

 opposed to the much extended anal fin. Eibs very stout. Upper Jurassic 

 and Lower Cretaceous of Europe, the type species being T. formosus, Ag., from 

 the Bavarian Lithographic Stone. 



Aethalion, Miinster. Lithographic Stone ; Bavaria. 



Family 2. Elopidae. 



Truiili fusiform, aiid caudal region relatively short. Head with well-developed 

 cheek plates, not enamelled ; jaws as in Clupeidae. Opercular apparatus complete, 

 with mimerous branchiostegal rays, aiul usually a gular plate. A single dorsal fin, 

 without adipose dorsal. Scales thin and cycloid, without bony layer. Lower 

 Cretaceous to Recent. 



Elopopsis, Heckel. Gape of mouth wide, with large teeth. E. fenzli, 

 Heckel, from Neocomian, Comen, Istria. E. ziegleri, v. d. Marck, and other 

 species in the Upper Cretaceous of Europe. 



Osmeroides, Ag. (Bhubdolepis, v. d. Marck nan Troschel ; Holcolepis, v. d. 

 Marck). Salmon-shaped fishes with minute clustered teeth, and very deeply 

 overlapping scales. 0. lewesiensis, Mantell sp., from English Chalk. Other 

 species in the Upper Cretaceous of "Westphalia and Mount Lebanon. 



Thrissopater, Giinther. Gault ; Folkestone. Fachyrhizodus, Dixon (Hypsodon, 

 Ag.). Upper Cretaceous ; Europe and North America. 



Rhacolepis, Ag. Upper Cretaceous ; Brazil. Megalops, Lac(§p. ; Elops, Linn. 

 Eocene to Recent. 



Family 3. Albulidae. 



* 



Clupeoids with very small mouth, and some inner bones with grinding teeth. 

 Branchiostegal rays few, and gular plate absent. Upper Cretaceous to Recent. 



Isfieus, Ag. An elongate fish, with much extended dorsal fin, small anal 

 fin, and forked tail. Teeth very small. Closely resembling the existing deep- 

 sea fish, Bathythrissa, Giinther. About three species in the Upper Cretaceous 

 of Westphalia and Syria. 



