Plate XIII. 



CRANIA OF BHADINICHTHYS DEANI, SP. NOV. 



All figures are represented of the natural size. 



A series of phosphatic nodules from the base of the Waverly 

 near Junction City, in Boyle county, Kentucky, which have 

 been cleaved in such manner as to display their organic nuclei. 

 In the case of each specimen here illustrated, this consists of 

 the headshield, sometimes with other naturally associated parts 

 of a new species of Rhadinichthys. The cranial roof may be 

 exposed, with or without the superficial ornament, according 

 to the position of the plane of fracture; and in a few fortunate 

 instances, an example of which is furnished by Figs. 8, 9, the 

 cranial roof has been lifted off so as to reveal the structure of 

 the mineralized brain, auditory organs, and arterial blood- 

 vessels. Most of these specimens, like the originals of Figs. 

 8 and 9, 14 and 15, are preserved in counterpart. The first of 

 these pairs is also shown in text-figure 40, A-B. 



Originals preserved in the Museum of Comparative Zoology 

 at Cambridge, Mass. Page 264 



344 



