364 The Ohio Naturalist. [Vol. VIII, No. 8, 



In figure 1 all bones of the side of the skull are foreshortened 

 since in a direct lateral view they lie at an angle of about thirty- 

 five degrees with the median line of the skull. The suborbital, 

 mandible, dorso-laterals, and clavicular are foreshortened dorso- 

 ventrally. They lie at an angle of about forty-five degrees with 

 the median longitudinal vertical plane of the body. This angle 

 was obtained from an undistorted dorso-median of the same 

 species. The relations of the other bones to the dorso-median 

 make it certain that it is approximately correct. In-figure;2 

 the bones are represented as lying in one plane almost exactly as 

 they lie in the specimen and all bones are drawn in proportion. 



The sutures in the skull are not distinct. The median occi- 

 pital and external occipital are the only bones of which it is possi- 

 ble to make out the outline distinctly. 



The suborbital as shown in figure 2 lies just as it does in the 

 specimen. The anterior end is restored from the anterior end of 

 the left suborbital. The notched anterior end has not been fig- 

 ured or described previously that I am aware. In the interior 

 of the notch the bone is fifteen millimeters thick and apparently 

 articulated with some other bone. The anterior slime canal 

 seems to be continuous with the anterior slime canal of the top of 

 the skull. The bone is usually broken where the slime canal 

 crosses it and the anterior end lost. Behind the orbit the sub- 

 orbital articulates with the postorbital for a short distance and 

 then does not touch the margin of the skull again till about the 

 middle of the marginal. At the place where it articulates the 

 slime canal of the marginal reaches the edge of the skull. Be- 

 hind the postorbital a bone lies between the suborbital and the 

 roof of the skull. It overlaps the upper edge of the suborbital 

 and is crushed against the skull in such a way that its relations 

 can not be determined. It is probably part of the left suborbital 

 displaced when the skull was crushed. The posterior end of the 

 suborbital lies against the inner part of the anterior projection of 

 the clavicular and thus completes the boxing in of the posterior 

 part of the skull as well as making the clavicular more rigid. 

 The top of the bone is thin and sinuous in outline. The dotted 

 lines in figure 2 indicate the parts of the bone that are missing. 



DiNICHTHYS TERRELLI NeWBERRY. 



