TRICHECHUS. 



167 



18. Brain of Walrus. A specimen presented by Mr C. Edward 

 Smith. The figure shows the mesial surface of the 

 left hemisphere. The brain of this species has been 

 described and figured by Turner in Challenger Rejjort 

 and in Joiirn. Anat. and Phys., vol. xxv , 1891. 



H, lobus hippocamiii ; S, Sylvian fissure ; sp, splenial, ph, postero-horizontai, 

 h, hippocami)al, cr, crucial fissures ; m, marginal, cc, callosal, he, liippo- 

 campal convolutions. 



11). Hyoid apparatus, body, antero-posterior diameter 2^ inches, 

 transverse 2f inches. Thyro-hyal, length 3J inches ; 

 stylo-hyal 4 J inches. 



20. Os Penis, 2U inches long; girth at base 8^ inches. 



Monro Collection. 



21. Os Penis, four specimens mounted on stand. 



Donor — Capt. Adams, s.s. " Maude," Dundee. 



22. Os Penis which had been broken during life and then 



rejDaired. 

 September 18(39. J^onor — Captain Adams, Dundee. 



23. Whisker. Thick horn-like bristle 2| inches long, from 



the muzzle of a Walrus, dissected to show the root 

 in its follicle. 



