ELASMOBRANOHII. 113 



These teeth agree so nearly with those of the recent Squatina 

 angelus, that one would scarcely have hesitated to place them in 

 that species, were it not that similar teeth are known from Lower 

 Eocene beds (Cat. Foss. Fishes, B. M., Part i, page 71) and also 

 from the Chalk ; and seeing that the Cretaceous forms, or at least 

 some of them, have been shown to belong to another species, 

 S. Crania, by Mr. Smith Woodward (Quart. Journ. Geol. Soc. 

 Vol. XLIL, p. 144, 1888), it is perhaps better for the present to 

 leave the species of the Crag form uncertain. 



The teeth described by Dr. J. Probst (Jahresh. Ver. Nat. Wiirtt., 

 Vol. XXXV., p. 177, 1879) as Squatina alata, from the Molasse of 

 Baltringen are very similar to ours from the Red Crag ; but on 

 the whole seem less like than those of S. angelus. It is probable 

 that the Red Crag specimens have been derived from older 

 deposits. 



Genus ACANTHIAS, Risso. 



ACANTHIAg VULGARIS. BISSO. 



[Piked Dog-fish.) 

 (Vert. Forest Bed, p. 131, Plate XIX., Fio. 8.) 



A single tooth referable to this species was found in the 

 Weybourn Crag of East Runton by Mr. Clement Eeid, and 

 another example has since been obtained at the same place by 

 Mr. A. Savin. 



Acanthias vulgaris is now living in temperate seas of the 

 Northern and Southern Hemispheres. 



o 63855. jj 



