392 ROBERT J. TERRY 



Now in the nasal capsule of Lacerta, at the place where the 

 zona annularis joins posteriorly the broader, bulging portion of 

 the side wall, a conchal fold is present, projecting into the nasal 

 cavity; within the aditus conchae, or entrance to the conchal 

 fold is the foramen for the lateral nasal nerve. The fissure-like 

 aditus extends dorso-ventrad, its convex lateral margin overhang- 

 ing the medial margin made by the zona annularis. Gaupp says 

 of it ('00, p. 484) : An der Muscheleinstlilpung slnd zwei Lamellen, 

 eine mediale und eine laterale, zu unterscheiden. Die mediale 

 Lamelle der Concha hegt in der direkten Fortsetzung der Seiten- 

 wand der vorderen Nasenkapselhalfte, sie endet ventral mit 



freiem Rande Die laterale Lamelle der Concha 



geht ventralwarts in den Boden des Recessus extraconchalis 

 tiber. 



The aditus, in Lacerta, lodges the external nasal gland; its 

 duct passes forward across the outer side of the zona annularis 

 to enter (he nasal mucosa through a gap in the side wall of the 

 nasal capsule, behind the processus alaris superior. Finally, 

 the concha itself forms a ventral and anterior partial partition 

 between the general space of the nasal capsule and a lateral 

 diverticulum which Gaupp has named the recessus extraconchahs. 

 The incomplete floor of the recessus is made by the ventral 

 prolongation of the lateral lamella of the concha. 



It seems evident that in the stage of development of the 

 ethmoidal skeleton in cat when fusion is occurring between the 

 parieto-tectal and paranasal cartilages, certain conditions are 

 presented which reflect the structure of the reptihan nasal cap- 

 sule, as shown by .the embryo of Lacerta. The general direc- 

 tion of the space between the parieto-tectal and paranasal car- 

 tilages on the one hand, and the aditus conchae on the other, 

 is the same, and its boundaries are made by lamellae similarly 

 placed in respect to each other; it is traversed by the lateral 

 nasal nerve in both forms. The position of the external nasal 

 gland in the aditus conchae of Lacerta and of the externally 

 coursing duct is, apparently, impossible to reconcile, on our 

 present knowledge, with the lateral nasal gland of Fehs and the 

 intranasal course of its duct, if these glands be comparable at 



