166 



SPECIMENS OF PINNIPEDIA. 



18. Maxillae, premaxillse, and tusks, young. Tusk, length 4| 

 inches, girth 2f inches, laterally compressed. On 

 each side two simple post-canines, but on the left 

 side a styliform tooth, ^ inch long, protruded on the 

 inner side of the canine alveolus. In the left pre- 

 maxillais an empty socket, but not in the right. 



14. Skull of a fcetus, artificially articulated. Dentition : 

 .11 11 3 3 



m. TT -, c, 



0' ' ^ ■ 5 5 



p.c. - 



1.5. Tusk, length 11 inches. 



Purchased — Woodcock Collection. 



16. Cranial cavity, cast of, from a skull in the Museum of the 



Royal College of Surgeons, England, showing the 

 general form of the brain. Purchased. 



17. Brain of Walrus, dissected. A specimen presented by Dr 



Charles Moon. The figure below is of the cranial 

 surface of the left hemisphere. 



B, olfactory bulb; s, Sylvian fissure ; ps, pre Sylvian fissure ; ssp, back of HUj)ra- 

 Sylviaii, cr, crucial, co, coronal, ml, medilateral fissures ; mlc, niedi- 

 lateral. ssc, siijira-Sylvian, syc, Sylvian, sgc, sigmoid, m, marginal 

 convolutions. 



