60 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



Dinichthys sp. 



In addition to the specimens of Dinichthys referred to various 

 species in the preceding pages, there are a considerable number of 

 remains that are at present specifically indeterminable. Some of them 

 no doubt belong to D. newberryi, others to D. magnificus, and a few 

 perhaps represent juvenile individuals. 



I. Specimens from the Conodont bed, (Genesee), at Eighteen Mile 

 Creek, Erie County, N. Y.; collected by W. L. Bryant. 



a. Cranial plates 



E 1981 Rosfal element of a small cranial shield (PI. 17, fig. i). It 

 is ornamented with minute tubercles, much smaller than 

 those of Dinichthys pustulosus, grouped partly into ver- 

 miculating, ridge-like rows. We have used this element 

 as a guide in restoring the front of the head of Dinichthys 

 magnificus in text-figure 9. 



Fig. 18. Outline of a Median Occipital of an Indeterminate Species or 

 Dinichthys. X f. E 2008. (See PL 19, fig. 2.) 



E 1994 External occipital showing sensory canal and articulating 

 socket. 



E 2008 Median occiptal. (PI. 19, fig. 2; text-fig. 18). The orna- 

 mentation consists of fine tubercles with a linear arrange- 

 ment, radiating from the centre of the plate, and recalling 

 the ornamentation of Holonema (Glyptaspis) abhreviatum. 



