294 E. C. STARRS. 



There is a notch on the posterior lateral surface of the epiotic 

 formed between a short process above and the projecting lower 

 edge of the epiotic below, into which the head of the posttemporal 

 is received. 



A long process projecting from the lateral edge of the pterotic 

 passes along the posterior edge of the hyomandibular, and reach- 

 ing almost to the opercle rigidly holds the suspensorium obliquely 

 outward. A similar process formed by the sphenotic and the 

 posterior end of the frontal projects over the anterior edge of the 

 hyomandibular head, and forms the posterior orbital margin. 



The frontals are broad and their anterior part as far back as 

 the posterior margin of the eyes bears a large square depressed 

 area in which the long flat premaxillary processes play. 



The parasphenoid reaches its greatest width at its extreme 

 anterior end where two wings reach far out on the prefrontals. 

 It grows narrower below the orbital region, but again broadens in 

 front of the prootics, and thence tapers quickly to a point at the 

 posterior end. 



The opposing prootics nearly meet at the median line above 

 the parasphenoid, and in front of the basioccipital. The main 

 parts of the fifth and seventh nerves occupy a notch in the 

 anterior part of the prootic, but a small branch of the former runs 

 through a small foramen just behind the notch. 



The prefrontal is a wide bone projecting laterally in front of the 

 orbital cavity, and supported behind by the broad parasphenoid. 

 It is pierced near its center by the olfactory nerve. 



The ethmoid is disk-shaped and apparently wholly membranous 

 in origin. It is situated between the anterior ends of the frontals 



o 



and does not extend in front of them. 



The vomer is very broad, having a broad shallow notch in its 

 anterior end, and with its lateral angles projecting. In a notch 

 formed between each lateral angle of the vomer and the end of 

 the palatine the maxillary fits just above its middle. 



THE LATERAL BONES OF THE HEAD. 



The hyomandibular, where it articulates with the cranium, ter- 

 minates in two knobs, which fit into concavities in the sphenotic 

 and pterotic. Below it has three articular processes ; one for the 



