286 ROBERT J. TERRY 



Cat 9.7 mm., frontal, Series 448 



Cat 10.6 mm., frontal, Series 476 



Cat 12 .0 mm., frontal, Series 404 



Cat 12.0 mm., horizontal of head. Series 403 

 Cat 12.0 mm., sagittal. Series 400 



Cat 17 . mm., sagittal. Series 492 



I am indebted also to Professor Huntington for the use of 

 series of cat embryos of the following stages, from the collec- 

 tion at the College of Physicians and Surgeons, Columbia 

 University. 



Cat 10 mm., Series 500 



Cat 11 mm., Series 473 



Cat 12 mm., Series 263 



Cat 13 mm.. Series 262 



From the collection in the Department of Anatomy of Wash- 

 ington University the following were studied: 



Cat 12 mm., frontal. Series 50 

 Cat 12 mm., transverse. Series 52 

 Cat 15 mm., transverse. Series 56 

 Cat 17 mm.. Series 80 



Cat 17 mm., sagittal. Series 81 

 Cat 17 mm., transverse. Series 82 



Several special reconstructions were made of complex regions. 

 One is of the left otic capsule of the 23.1 mm. embryo; a second 

 represents the course and relations of the facial nerve in the 

 same specimen; a third, the eye-ball and its muscles in relation 

 to the chondrocranium; a fourth the cranial relations of the noto- 

 chord. The atlas and epistropheus were included in the main 

 model. The base of the cranium in the region of the carotid 

 artery was reconstructed from a 12 mm. embryo; from the same 

 a reconstruction of the hypophyseal cartilage was made. The 

 nasal capsule and nasal sac have been modeled from an embryo 

 of 17 mm. 



The study of all stages of the chondrocranium was facilitated 

 by a collection of preparations made by the van Wijhe ('02) 



