242 



Tb. 1 — 5. — The five tuberosities seen externally on the ocular side passing 

 backwards from between the two eyes. 



Thm. — Thymus gland. 



f. /i??i.—Tr uncus hyomandibularis facialis. 



t. inf. — Truncus infraorbitalis (trigemini et facialis). 



Tr. P. — Transverse process. 



U. + Hp. 3. — Urostyle and third hypural fused together. 



IT. Hy. — Basi-hyal. 



up. in. hue. — Upper division of the R. buccalis internus facialis. 



Ur. — Urostyle. 



Uret. — Ureter. 



Ur. pp. — Urinary papilla. 



\ — Central and vertical chambers of the utriculus. 

 utr.' 



V. 2 — 6. — Ventral roots of spinal nerves 2 to 6. 



V. — Vertebral centra numbered from before backwards. V^ is the atlas. 



V. b.' \ 



V. h. V — Ventral roots of the first spinal nerve. 



V. c. j 



V. card. — Cardinal vein. 



Ven. — Ventricle. 



V. gen. — Genital vein. 



V. Jiep. — Hepatic vein. 



V. jug. ... 



y — Superior and inferior lugular vems. 

 V.jug.' j ^ ■• ° 



Vo. — Vomer. 



Vp. — Portal veins. 



V. pc. — Right precaval vein. 



Plate I. 



Fig. 1. Dorsal surface of an undried skull of a 65cni. 

 Plaice. Natural size. The dotted line indi- 

 cates the departure from the symmetry. The 

 anterior extremity is somewhat schematic, 

 and is drawn as if seen a little from behind. 

 The fenestra in the ethmoid cartilage is only 

 partially visible in a strictly dorsal view. 



