1 6 HAY. [Vol. IV. 



nerve will receive further attention. Immediately behind the 

 foramen just considered is a third break in the cartilage, the 

 purpose of which I have not been able to determine. It pos- 

 sibly gives passage to some of the lymph sinuses. 



In sections made previously to decalcification, there are seen 

 abundant otolithic deposits. 



In front of the otic capsules, the trabecular walls are low and 

 slope gently downward and inward. The foramen for the 

 branches of the trigeminal nerve is large, and is traversed by 

 the long, slender, ascending process of the suspensorium (Figs. 

 3 and 4, As.p.), which process passes between the orbito-nasal 

 and the other branches of the fifth nerve. Anteriorly to this 

 foramen the cranial walls, becoming lower, approach each other 

 gradually until they finally meet and coalesce, and thus enclose 

 the ovate-acuminate pituitary space. A little further forward^ 

 the trabeculae again separate into the cornua. 



In the low trabecular wall, just behind the eye, are found two 

 foramina. Through the most anterior passes the optic nerve. 

 The posterior possibly admits the passage of the oculo-motor ; 

 but this I have not been able to demonstrate. 



In front of the optic foramen, there is given off from the 

 upper border of the trabecular wall a rod of cartilage which 

 extends outward and forward to a point just in front of the eye, 

 and above the hinder end of the nasal-sac. Here it expands 

 into a rudimentary capsule for this organ (Figs. 3 and 4, A%. C. '). 



From the point where the above-mentioned rod leaves the 

 cranial wall, the trabeculae are slender and rod-like, but increase 

 somewhat in size to their coalescence in the ethmoidal region. 

 The lateral halves of the ethmoidal cartilage slope downward 

 and outward. There is no trace of a naso-septal lamina. The 

 trabecular cornua are bilobate, one portion of each (Figs. 3 and 

 4, Cj.'), forming a plate that curves outward under the nasal- 

 sac ; the other running forward, at first a little outward, then 

 downward and inward, until it terminates in a point close to 

 the base of the ascending process of the premaxilla (Figs. 3 

 and 4, C.t.). 



Just below the eye there is a short piece of cartilage that 

 stands outward and forward from the trabeculae, to which it is 

 joined by means of connective tissue. This is the antorbital 

 (Fig. 4, Ant.). Running parallel with the trabecula along its 



