4. STENORHTNCHtrS. 



15 



the transverse suture between the two bones in the palate is rather 

 more than two- thirds the distance from the inner edge of the cutting- 

 teeth. 



e. SkuU. Figured in ' Zool. Erebus & Terror,' t. 8. f. 3, 5. Antarctic 

 Ocean. Presented by the Lords of the Admiralty. 

 These skulls differ considerably from one another in the form of 

 the palate and iu the teeth ; but it is probable that the teeth of the 

 skull (6) belonging to the skin (Zool. Erebus & Terror, t. 8. f. 1, 2, 4) 

 are a malformation. 



tt Lower jaw strong, with an acute angle behind; orbits moderate. 



4. STENORHYNCHUS. 



SkuU elongate ; muzzle elongate ; grinders compressed, with three 

 cylindrical elongate lobes, the centre one longest and largest. 



Head elongate ; ear-conch none externally ; muzzle broad, elon- 

 gate ; mufB.e hairy to the edge and between the nostrils ; nostrils 

 acute ; whiskers slightly waved. Face elongate, rather compressed ; 

 nose tapering, rather produced and compressed on each side ; orbits 

 moderate ; the petrose portion of the temporal bone rather convex. 



Cutting-teeth |^, conical, acute, incurved, granular, and with a 

 cutting-edge on each side in a regular row; the two outer larger ; the 

 upper much larger than the lower, and separated from the canines 

 by a broad space. Canines conical, with sharp cutting-edges within 

 and on the sides, the upper largest. Grinders ||, withmoderate roots, 

 separated from the crown by a narrow groove ; the crown compressed, 

 divided into three elongate lobes, the centre lobe much the largest, 

 longest, and subcyhndrical, the anterior and posterior lobes conical ; 



Fig. 5. 



Stenorhynchus Leptonyx. Skvdl and grinders. 



the bases of the lobes are surrounded by a sharp-edged ridge, with 

 two small, short, conical tubercles on the inner side, the larger one 

 being at the liase of the separation of the hinder from the middle" 

 lobe : the front grinder in each jaw is rather the thickest, with a 



