192 



W. HAROLD LEIGH-SHAEPE 



The figures have been executed from them especially for me 

 by Miss Edith C. Humphreys, and the catalogue number is 

 appended. A summary of the conclusions drawn from these 

 observations follows. 



Fig. 1 Cladoselache kepleri. K., kidney; *, see text. 



CLADOSELACHE KEPLERI 



This primitive Palaeozoic fish occupies the unique position of 

 the oldest known elasmobranch. It possesses no claspers; in 

 consequence, the bases of the pelvic fins appear wider apart than 

 is usual. Figure 1 represents the specimen P. 9269, the Newberry 

 sp. from the Upper Devonian (Cleveland Shale), Berea, Ohio, 

 U. S. A. (WiUiam Clark collection). 



