134 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



example of Cladoselache thus far found in New York State, and with 

 one other exception,^^ the only one found in any formation outside the 

 Cleveland shale of Ohio. 



E 2027 A fin of large size, the base measuring i8o mm. and its 

 length 260 mm. It is remarkable for its narrow pointed 

 form, and for the large number of rays, which are very 

 slender, and about 80 in number. Secondary and ter- 

 tiary rays are apparently absent. It represents a shark 

 about 4 feet in length. 



It should be pointed out that while this specimen is 

 close to Cladoselache, and may for the present be left in 

 that genus, still its narrowness, the great number of its 

 rays which far exceeds that found in any other species of 

 Cladoselache, may ultimately necessitate its being placed 

 in a distinct genus. 



From a concretion found in the Rhinestreet shale, 

 shore of Lake Erie at the mouth of Eighteen Mile Creek, 

 Erie County, N. Y. Collected by Dr. Herbert U. 

 Williams. 



Cladoselache fyleri (Newberry) 



(PL 48) 



This is the most abundant species of shark in the Cleveland shales. 

 It is represented in the collection by a splendid specimen. 



E 2480 A complete shapk shown in ventral view, with the pectorals 

 expanded. The ventrals are missing. The caudal is 

 seen in section. In the precaudal region the horizontal 

 keels are beautifully shown, standing out sharply through 

 the contrast of their black color. In the head region the 

 jaws are shown, although somewhat sHifted from their 

 proper position. A number of teeth are present; they 

 exhibit fine striations on the central cusps, and in some of 

 them extremely small denticles are present between the 

 main and the lateral cusps. The sclerotic rings are well 

 preserved. The pectoral shows 20 primary rays and 

 8 secondaries; no tertiaries are apparent. 



" The other exception is a caudal fin in a small nodule from the Waverly (basal Carbonic) of Ken- 

 tucky [No. 7583 Amer. Mus.J. Mem. Amer. Mus. Nat. Hist., ix, 241, fig. 17. 



