974 



MR. J. H. LLOYD AND MISS EDITH SHEPPARD ON 



The ventral view of the skull shows that a groove, about one 

 inch in length, runs from the distal end of the olfactory capsule 

 to the nostril. The end of the capsule also serves as a fui-tlier 

 support to the anterior of the orbit. Gegenbaur (5) has incor- 

 rectly figured the extent of the cavity of the olfactory capsule 

 and the position of the nostril. 



A very slender bar (s.c.) of fibrous tissue, which is perforated 

 by a fine canal, runs from the auditory process to the olfactory 

 capsule, and then runs along the posterior edge of the capsule. 

 The structure of this bar suggests that it is a sensory canal. It 

 is figured as far as it could be traced in our specimen, but we do 

 not believe that it is complete. It has been figured, for about a 



Text-figure 3. 



?/7.y. 



pa.d 



s.o. 



Ventral View of Skull. 



ep.cf. ethmo-palatine groove. 



f. foramina. 



n. nostril. 

 n.g. nasal groove. 

 s.c. sensory canal. 

 s.o. 1st spino-occipital foramen. 



p. process on cranium for articulation 

 of ethmopalatine process. 



I, olfactory nerve. The dotted area 

 anterior to the nerve indicates the 

 extent of the olfactory sac. 



third of the length shown in our drawing, by Gegenbaur (6), and 

 he has lettered it (x), but does not explain it in any way. . 



The ventral side of the cranium (text-fig. 3) is marked by a 

 deep ethmopalatine groove (ep.g.) into which fits the narrowed 

 middle poi-tion of the upper jaw. On each side of this nari-owed 

 portion of the jaw is 8.n ethmopalatine process. Each of these fits 

 against a corresponding process (p.) on the cranium, one being 

 situated immediately anterior to each of the two outer edges of 

 the ethinopalatine groove. The processes on the cranium are 

 perforated on the mesial side by a single lai-ge foramen, which 

 opens dorsally into the pre-auditory depression In addition in 

 this regior there are four smaller foramina on each side. 



