Terry — The Nasal Skeleton of Arably stoma punctattim. 109^ 



The Eumus palatinus of the VII (P.) appears to consist 

 of two bundles which run together along the lateral edge 

 of the trabecula and then under the trabecular horn. The 

 medial bundle is joined by the second branch of the oph- 

 thalmic. 



SUMMARY OF OBSERVATIONS. 



1. The nasal sac is at first laterad of the brain. In the 

 last stage it is laterad of the brain in its caudal third only ; 

 in their cephalic two-thirds the sacs are in front of the brain, 

 separated from each other by the nasal septum and the inter- 

 nasal space. Jacobson's organ, at first ventrad of the main- 

 sac, later lies in a ventro-lateral position. Between the main- 

 sac and the trabecular horn is a narrow space occupied in part 

 by Jacobson's organ and glands. 



2. The Crista trabeculae, in the early stages, reaches for- 

 ward only as far as the olfactory bulb. 



3. The trabeculae in the ethmoidal region are at first sep- 

 arate and end in medially directed processes. 



4. The Cornu trabeculae extends beneath the cephalic end 

 of the olfactory sac; its extremity is always near Jacobson's 

 organ which it supports in the older stages. 



5. The antorbital process chondrifies independently in 

 Amblystoma. Its union with the trabecula is at the level of 

 the anterior edge of the trabecular crest. 



6. The rod (Col. eth.) chondrifies independently in the 

 membranous cranial wall of the ethmoidal region. Its posi- 

 tion is opposite the dorso-cephalic part of the olfactory bulb 

 and dorsad of the olfactory nerve ; the rod is in the same 

 sagittal plane as the trabecula and alongside of the dorso- 

 mesal angle of the nasal sac. 



7. The rod (Col. eth.) becomes connected secondarily 

 withthe trabecula and with the trabecular crest completino". 

 the boundaries of the olfactory foramen. 



