No. 382.] DINICHTHYID OSTEOLOGY. 
749 
great resemblance to Coccosteus, yet even more striking is the 
similarity in pattern of the head bones and arrangement of 
the sensory canals. 
The transitional characters are so appar- 
een hen? ODE m APA aa ma 
Fic. + Dini 
Eastm. Hamilt ton Limestone, Milwaukee, Wiscon 
ment Mee satares, sensory canals, and finely tuberculated ornam 
Original in tional Museum Se 0.19). Di 
x r 
in, Frag- 
nt of cranium. 
U. 
cated by the arrow; anki: as in Fig 
Direction of erai axis indi- 
ent as to preclude the idea of assigning the two genera to 
Separate families. 
An attempt is made in Fig. 2 to represent the cranial shield 
of D. pustulosus as if flattened out, thus facilitating a compari- 
