——— 
Charles F. W. McClure 403 
A. s. i. p., A. spermatica interna posterior. 
A. s. m., A. sacralis media. 
bl., Accessory branch of the A. spermatica interna posterior to the 
bladder. 
Pe., Postcava. 
P. R., Postrenal Division of Postcava. 
ps., Accessory branch of the A. spermatica interna posterior to the psoas 
muscle. 
V.i. c., V. iliaca communis. 
V. i. e., V. iliaca externa. , 
V.i.i., V. iliaca interna. 
V. i. i. c., V. iliaca interna communis. 
V. i. 1, V. iliolumbalis. 
V. p. v., V. pudendovesicalis. 
V.r., V. renalis. 
V. s. m., V. sacralis media. 
V. sp. i., V. spermatica interna. 
PLATE I.—TypPeE I. 
Fic. 1. Ventral view (f). 
Fig. 2. Ventral view (9). Postcava bifurcated caudad of 
VY. spermatica interna sinistra. 
Fie. 3. Ventral view (). An accessory branch of the A. 
spermatica interna posterior (A. s. i. p.) is represented in 
this Fig. which supplies the psoas muscle (ps.) and bladder 
(bl.). 
Fie. 4. Ventral view (j'). An anastomosis is present on 
the right side between the V. spermatica interna and the 
V. pudendovesicalis. 
Fie. 5. Dorsal view (.f). 
PLATE J]1.—Type II. 
Fie. 6. Ventral view (,'). Posteava bifurcated caudad of 
Vy. spermaticae. Postcava formed here as in Echidna 
aculeata. 
Fie. 7. Ventral view (9). Postcava bifurcated caudad of 
Vy. spermaticae internae. 
Fie. 8. Ventral view (<'). Postcava bifurcated caudad of 
Vy. spermaticae internae. 
Fic. 9. Ventral view (,P). 
Fie. 10. Ventral view ('). Foramen in posteava through 
which the Aa. spermaticae internae posteriores pass. Post- 
cava partially bifurcated at its caudal end. On account 
of the variable character of the V. pudendovesicalis this 
vein which is connected, on the right side, with the V. 
iliaca externa and the VY. iliaca interna communis has not 
been regarded as entering into the formation of the post- 
cava. 
