XII 



PHYLUM MOLLUSCA 



733 



Fie. r>42 >>;*. Nautilus pompilius (male), origin i pallial and genital arteries; ant. goZ. a. 

 anterior pallia! artery; if. /</. v, efferent branchial veins; ;/.//. a. 1, artery to vesieula 

 seminalis (<. gnu.) ; ;/<_;(. . '2, testieular artery and its branches ; </, ,t. >/. 3, artery to pyrifurm 

 sac ; /i. ,<. epennatophore sue ; ,>.-,?. ////. . posterior pallial artery ; ///. pyriform sae ; rect. 

 rectum ; ti.s(. testis. (After Willey.) 



tren.c \\ 



clen 



ren.app 



r.ant.cLur \rant.ttff / \ . l.neph.s 



r.nephJ \ lj> , \\ren..a. f p 



r-pcstnefjh.ap 



p.nafj" 

 rposl- 7i eph s 



FIG. ij43. Nautilus pompilius, renal sacs, with ctenidia and i.itlier related parts, as seen from 

 the posterior aspect; the boundaries of the four renal saes represented by dotted lines. 

 ((. 1. (iff. left oral afferent vessel; i.-t *.,>.. right etenidia ; /. /IL///I. .s'. left nephridial sac; 

 /. in /lit. iiji. left oral nephridial aperture; I. jioit. nepli. </>. left aboral nephridial 

 aperture; I. pout. -,u.j>/i. s. left aboral nephridial sac; j>. L ff. left aboral afferent vessel; 

 p. r. (($'. right aboral afferent vessel ; r. ant. nrf'. right oral afferent vessel ; r. ant. aw. right 

 oral aurk-le; i\ii. app. renal appendages; .-. ,>,/ili. n/i. right nepliridial aiierture ; r. , < . 

 in.ji/i. .s\ right aboral nephridial sac ; /-. c. up. right viscero-pericardial aperture ; a/i. c. vena 

 cava ; ct,it. ventricle. 



