.-,oi; 



DE. J. MLEIE ON THE ANATOMY OF THE SEA-LION. 



adjoining minute accessory tiny open fork, situate behind but to the inside of the ovale, 

 and immediately in front of the periotic. The latter nodular bone dominantly projects, 

 a concavity of the cerebellum at the flocculus resting thereon. Anteriorly the aquae- 

 ductus Fallopii is barely visible in this view ; neither is the meatus auditorius interims, 

 which looks towards the median line ; and the aquseductus vestibuli similarly occupies 

 a recess on the posterior face. Below the last is the carotid canal, behind the large 

 jugular perforation. An anterior condyloid foramen pierces the corner betwixt basi- 

 and exoccipitals, running nearly vertically towards the jugular groove. 



For a description of the longitudinal vertical section of the aged skull, viz. that in 

 PL LXXVIL fig. 22, I refer to Prof. Owen's notice in the Cat. Coll. Surg., specimen 

 No. 3971. It is sufficient for my purpose to call attention to the great occipital crest, 

 thickness of frontal, position of ethmoid and turbinals, maxillo-palatine cleft, and 

 osseous tentorium, as all more fully pronounced in character than what obtains in 

 younger skulls which, nevertheless, in other general respects agree. 



f. Sexual differences. — In a previous communication to this Society, I directed attention 

 to certain visual distinctions extant between the male and female skulls of Otaria juhata, 

 and gave figures of the same, hereunder reproduced. I was not then aware that Owen 

 had commented on the same fact, and therefore now append his remarks in a footnote '. 



Fig. 1. 



Fig. 2. 



Palatal views of adult male (fig. 1) and female (tig. 2) skulls of Otaria jubata. To scale j nat. size. 



From P.Z. S. 1869, p. 103. 



1 "It differs from that of the male in its inferior size, but agrees with it in all essential or modifiable cha- 

 racters. The more feeble bite and smaller temporal muscles have not required the elevation of the temporal 



