506 DR. J. MURIE 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 aque- 
ductus Fallopii is barely visible in this view; neither is the meatus auditorius internus, 
which looks towards the median line; and the aqueductus 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. LXXVII. fig. 22, I refer to Prof. Owen’s notice in the Cat. Coll. Surg., specimen 
No. 5971. 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 Ofaria jubata, 
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’. 
Palatal views of adult male (fig. 1) and female (fig. 2) skulls of Otaria jubata. To scale 4 nat. size. 
From P.Z.8. 1869, Be 103. 
1 «Tt differs from that of the male in its inferior size, but agrees with it in all essential or 7 inodifiatilé cha- 
racters. The more feeble bite and smaller temporal muscles haye not required the elevation of the temporal 
