242, 
Tb. 1—5.—The five tuberosities seen externally on the ocular side passing 
backwards from between the two eyes. 
Thm.—Thymus gland. 
t. hm.—Truncus hyomandibularis facialis. 
t. inf. —Truncus intraorbitalis (trigemini et facialis). 
Tr, P.—Transverse process. 
U. + Hp. 3.—Urostyle and third hypural fused together. 
U. Hy.—Basi-hyal. 
up. im. bue.—Upper division of the R. buccalis internus facialis. 
Ur.—Urostyle. 
Uret.—Ureter. 
Ur. pp.—Urinary papilla. 
ve | centr and vertical chambers of the utriculus. 
v, 2—6.—Ventral roots of spinal nerves 2 to 6. 
V.—Vertebral centra numbered from before backwards. V1! is the atlas. 
ViD.! 
v. b. —Ventral roots of the first spinal nerve. 
V. C. 
V. card.—Cardinal vein. 
Ven.—Veutricle. 
V. gen.—Genital vein. 
V. hep.—Hepatic vein. 
V. jug. 
V. jug.’ j 
Vo.—Vomer. 
—Superior and inferior jugular veins. 
Vp.—Portal veins. 
V. pe.—Right precaval vein. 
Pirate I. 
Fig. 1. Dorsal surface of an undried skull of a 66cm. 
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: 
