FOSSIL FISHES. 4 1 



Among all the species of Cladodus known to me, there is only one 

 other than that now described, in which the exterior jjair of lateral cusps 

 are larger tlian the inner ones. This is a beautiful new species sent me 

 by Dr. C. Rominger, the State Geologist of Michigan, and by him ob- 

 tained from the Waverly group of that State. A brief description of that 

 species is appended, but the specimen came to me too late to be figured for 

 this volume. , In G. Romingeri the interior pair of secondary cones is 

 very little larger than the outer ones, while in C Hertzeri they are more 

 than twice as long. 



Formation and Locality : Obtained by Rev. H. Hertzer from the beds of impure lime- 

 stone in the red shale, under the Berea Grit, at Berea, Ohio. 



Cladodus Pattersoni (n. sp.). 



Plate LVIIL, Figs. 6, 6 a. 



Teeth small, not exceeding 6 lines in height ; base small, rounded, 

 bearing no lateral denticles. Median cone robust, much reflexed and 

 sigmoidally curved at point, smooth and polished throughout. Near the 

 base the section is circular, toward the apex flattened witli a winged 

 margin that makes it strongly ancipital. The small, rounded base appar- 

 ently supported only one cone. The plain and polished surface, strong 

 curvature and ancipital apex of the central cone, will serve to distinguish 

 this species at once from any other. 



A specimen collected by Prof. Andrews is of special interest, as it 

 consists of a lower jaw bearing nearly its entire dentition, the teeth in 

 position. These are placed apparently in quincunx order, alternating 

 instead of forming antero-posterior rows as in most of our sharks. So 

 far as can be seen all the teeth have precisely the same form ; those 

 situated at the lateral extremities of the dental area being much smaller 

 than the others, but not otherwise difEorent. The number of teeth borne 

 by both jaws must have been three hundred to four hundred. 



Formation and Loeality : " Waverly Black Shale," Waverly, Ohio. 



Cladodus stjbulatus (n. sp.). ' 



Plate LVIIL, Fig. 7. 



Teeth small, 6 lines in height and breadth ; base elliptical, equal in 

 breadth to height of tootli, bearing a central cone with two nearly equal 



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