EASTMAN: THE DINICHTHYIDS. 41 
It is evident from the figures of the type specimen of D. ringuebergil that 
the carinal process has been considerably eroded, and the diagram of the infe- 
rior surface is not wholly accurate. If the anterior margin is entire, as repre- 
sented for this species, it covers the region back of the head almost as completely 
as in Coccosteus. The type specimen is preserved in the private collection of 
its first describer, Mr. E. N. S. Ringueberg, at Lockport, New York. All of 
the specimens discovered by Mr. Mixer that are mentioned in the present 
paper are preserved in the collection of the Buffalo Society of Natural Sciences. 
Another very beautiful example of a young Dinichthyid is preserved in the 
Museum of Oberlin College, and through the courtesy of Professor A. A. 
Wright we have been enabled to reproduce a photograph of it, shown in 
Plate 5, Fig. 3. It is only about 5 em. long, and 4.5 cm, in maximum width ; 
the external surface is non-tuberculated. Unfortunately the terminal process 
is missing, but the inferior carina is very distinct. It is also seen to be strongly 
emarginate in front. 
The drawings for Plates 1 to 3 have been executed by Messrs. ©. A. King 
and J. W. Folsom. Plates 4 and 5 are reproduced from photographs of the 
original specimens, taken by Dr. T. A. Jaggar, Jr., excepting Figure 3 of 
Plate 5. 
1 Amer. Journ. Science, [3], Vol. XX VII. p. 477, June, 1884. 
