NO. 1976. 



TREE8HBEWS: FAMILY TUPAIID.E—LYON. 



155 



meet at a more anterior point, forming a sagittal crest or ridge quite 

 as long as each temporal ridge. In Tana the sagittal ridge is much 

 lower and only about a third or a fourth the length of the less con- 

 spicuous temporal ridges. The surface for the attachment of the 

 temporal muscles is thus much greater in Urogale than in Tana or 

 Tupaia. The coronoid process of the mandible is correspondingly 

 increased in size. In Urogale the lambdoid region of the skull pro- 

 jects further posteriorly than in Tana or Tu])aia, and when viewed 

 from behind, the two ridges make a more acute angle than they do 

 in the the other genera. The fenestra in the zygoma of Urogale is 

 reduced to an almost invisible slit. A rather conspicuous grooved 

 surface is found on the underside of the maxiUary zygomatic root. 

 In Tana this surface is much smaller and 



less conspicuous. The zygomata are more ^ ^ 



spreading in Urogale than in Tana or ^ Im 



Tupaia. The bony palate is more ossified ^ 



in Urogale and without the vacuities more 

 often seen than not in Tanu and Tupaia; 

 the interpterygoid space is slightly nar- 

 rower; the external plate larger and plate- 

 Uke instead of forming a short wide hook, 

 as in Tana. The gi-eatest width of the 

 brain case is about the same in Urogale 

 and the large species group of Tana, but 

 it rapidly narrows anteriorly, so that the 

 postorbital constriction is distinctly less 

 than the preorbital; in Tana the reverse 

 condition holds. The orbit is relatively 

 and absolutely slightly smaller in Urogale 

 than in Tana. When the skulls of the two 



Fig. 13.— Upper and lower tooth- 

 Eows of Urogale everetti; Type, 

 X 2; Reg. No. 79.5.3.11, British 



MUSEITM, ZaMBOANGA, MINDANAO, 



Philippine Islands. 



genera are looked at from above, the pos- 

 terior bar of the orbit divides the space 

 between the zygoma and the rest of the 

 skull into two approximately equal parts, 



one anterior and one posterior, in Urogale; in Tana the anterior 

 portion is distinctly the larger of the two. The mandible of Urogale 

 is distinctly heavier and more massive than that of Tana or Tupaia 

 and the ascending ramus larger and more upright, especially seen in 

 the coronoid and angular processes; the cond^T'le is also somewhat 

 larger. See figure 12, page 154. (Plate 11, fig. 6.) 



Dental characters. — Urogale differe more in respect to its teeth from 

 the other members of the subfamily Tupaiinte than in respect to its 

 skulL The second pan* of upper incisors are enormously developed 

 and are rather canine-like in form, but straighter than the ordinary 

 canine tooth, so that instead of having.a backward curving fang the axis 



