CATALOG OP THE FOSSIL FISHES IN THE CARNEGIE MUSEUM. 399 



and their general structure points to their being probably survivors of ancestral 

 rays. 



5. Squatina alifera Miinster. (Plate LXVII, fig. 2.) 



(For synonymy c/. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. I, p. 66.) 



"Head gently rounded and blunt in front. Dermal granules varying from 

 simple or stellate booklets to blunt, rounded tubercles; no great mass of the latter 

 observed in advance of the head or paired fins. Caudal fin very large" (A. kS. 

 Woodward, I. c, Pt. I, p. 67). 



One excellently preserved specimen belonging to this species, in some respects 

 more perfect than the type, is to be seen on exhibition in the Hall of Vertebrate 

 Paleontology of the Carnegie Museum. The structure of the head, pectoral and 

 pelvic arches, fin-rays, the dentition, etc., is very well shown. The anterior dorsal 

 and caudal fins are not indicated. The posterior dorsal fin is triangular, of com- 

 paratively large size, and situated about midway the length of the tail, as in the 

 type. The total length of the fish is about 88 cm. 



6. Squatina minor Eastman. (Plate LVH, fig. 3.) 



1911. Squatina minor C. R. Eastman, Amer. Journ. Sci. (4), Vol. XXXI, p. 403, 

 PL III. 



Type. — Complete skeleton; Carnegie Museum (Cat. No. 4737). 



In general like the preceding species, but distinguished from it by its smaller 

 size (total length 49 cm.), relatively narrower disk, and more posterior position of 

 both dorsal fins. The first dorsal arises at a point about one-third of the distance 

 between the hinder extremity of the pelvic fins and the tip of the tail; the second 

 dorsal midway between the latter point and origin of the first dorsal. The denti- 

 tion and other characters are as in the typical species. 



The differential characters given in the foregoing diagnosis are considered of 

 sufficient weight to warrant a specific separation between the form here described 

 and its larger contemporary which accompanies it in the same locality, S. alifera. 

 Not more than two or three examples of the latter form have thus far been brought 

 to light, so far as published information goes, and the holotype of the recently 

 described allied species is unique. Hence the genus Squatina must be regarded 

 as having been represented very sparsely and by not more than three species at 

 the time of its advent in the Upper Jura of Solenhofen. 



