34 



PISCES 



CLASS I 



of rather doubtful relationships. Most species describecl under this name 

 referable to Lamna and Odontaspis. Cretaceous and Eocene. 



Lamna, Cuv. Second dorsal fin and the anal very small. Side of tail with 

 keel. Teeth as in Odontaspis, but the principal cusp usually somewhat broader 

 and the lateral denticles 

 larger. Very abundant 

 in the Chalk, Tertiaries, 

 and existing seas. 



OxyrJiina, Ag. (Fig. 

 68). Only difFering from 



F](i. üü. 

 Otodus appendü'u- 

 latus, Ag. Pläner; 

 Quedlinburg. 



Fig. ()7. 

 Otodiis obliqmis, Ag. Extenial 

 aspect of tooth. Eocene ; Sheppey. 



Fig. 68. 



(hi/rhinaplicatilis, Ag. Mio- 

 cene'; Neudörfl, Hungary. 



Lamrut in the teeth lacking lateral denticles. Cretaceous to Recent. 0. 

 mantelli, Ag., the commonest Cretaceous species both in Europe and North 

 America, the nearly complete dentition known from Kansas. 0. desori, Ag., 

 chiefly Lower Tertiary ; 0. hastalis, Ag., 

 chiefly Upper Tertiary. 



Alopecias, M. and H. Tertiary and 

 Recent. 



Coi-ax, Ag. (Fig. 69). Known only ^^bh^ -^ 



by low triangulär teeth with sharp, JHHI\- "'^ 



serrated edges, and a large root. Com- 

 mon in the Middle and Upper Cre- 

 taceous. C. pristodordus, Ag., from 

 Maastricht, North Africa (Fig. 69), and 



('onu: jyistodoutHs, Ag. 

 Upper Chalk ; Oasis of 

 Dacliel, Libyan Desert. 



'aicharodonmegalodo)i,Ag. Miocene ; Malta. 



supposed Eocene of Alabama. C.falcatus, Ag., European and North American 

 Cretaceous. 



Carcharodon, M. and H. (Fig. 70). Second dorsal fin and the anal very 

 small. Side of tail with keel. Teeth very large and triangulär, with 

 serrated lateral edges, flattened outer face, convex inner face. One Upper 



