FOSSIL FISHES. 4< 



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

 other than that now described, in which the exterior pair of hxteral cusps 

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

 l)y Dr. C Roniinger, the State Geologist of Michigan, and by him ob- 

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

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

 this volume. In G. Romlngeri 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 Loc^ity : Obtained by Rev. II. Hertzer from the beds of impure lime- 

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



Cladodlts Pattersoni (n, sp.). 



Plate LVIII., Figs. 6, 6 a. 



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

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

 sigmoidally curved at point, smooth and polished throughout. N'ear the 

 base the section is circular, toward the apex flattened with 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 ordei-, 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 diifei-ent. The number of teeth borne 

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



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



Cladodus sttbtjlatus (n. sp.). 



Plate LVIII., Fig. 7. 



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

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

 3 



