12 



Fossil Fishes. 



Wall-case, 

 No. 3. 

 Table-case, 

 No. 30. 



Wall-case, 

 No. 3. 

 Table-case, 

 No. 30. 



Wall-case, 

 No. 3. 



The Spinacidce are represented by the living: genus CentrophoruR in 

 the Cretaceous of Mount Lebanon ; Palceospinax, from the English 

 Lias, is also commonly placed with this family, though its position 

 is very doubtful. 



The SquafinidcB, or " An gel- fishes," resemble the Sharks in the 

 lateral position of the gill- clefts, but have a depressed body like 

 that of the Rays. The mouth is terminal and the teeth are sharply 

 pointed. Nearly complete examples of the existing genus Squatina 

 have been discovered in the Lithographic Stone (Upper Oolite) of 

 Bavaria (Figs. 25, 26), and in the Chalk of Mount Lebanon and 

 Westphalia. More fragmentary remains are also met with in the 

 English Chalk and Tertiaries. 



Fig. 25.— Squatina alifera (after Fraas), Lithographic Stone (Upper Oolite), Bavaria. 



Fig. 26.— Squatina speciosa, Lithographic Stone (Upper Oolite), Bavaria. 

 a, mandibular cartilage ; b, pectoral arch ; c, pectoral fin ; d, pelvic arch ; e, pelvic fin. 



Of the Squalorajida, from the Lias of Lyme Regis, several fine 

 specimens are exhibited in the wall-case. SquaUraja seems to be 

 allied in many respects to the living Frist iophorida, but has several 



