44 THE ANATOMY OF NAUTILUS POMPILIUS. 



of the additional four apertures ; but the author states that " on 

 each side, at the roots of the anterior branchiae, there is a small 

 mamillary eminence with a transverse slit, which conducts from 

 the branchial cavity to one of the compartments of the pericar- 

 dium containing two clusters of venous glands. There are also 

 two similar, but smaller, slits, contiguous to one another, near the 

 root of the posterior branchia on each side, which lead to and may 

 admit sea-water into the compartments containing the posterior 

 cluster of the venous follicles." In this work the ovary is not 

 only described, hut figured, on the right side of the gizzard. The 

 figure, however, rightly places the greater part of the ovary below 

 that organ. 



Nautilus pompilius. Fig. 2. 



Natural Size. 



The pallio-visceral ligament seen from below : torn on the right side to show 

 the rectum and oviduct ; cut through on the left side along the dotted line 

 close to d' in the preceding figure. 



a. Anus. b. Oviducal aperture, c. Heart, d. Left branchial veins, e. Right 

 branchial veins. /. Oviduct cut through, ^j^. Ovary. A. Rectum. ». Mantle. 

 k h h. Pallio-visceral ligament ; V. its torn portion. The oval " aperture 

 for the siphonal artery" is seen to the left of c', and the right-hand style 

 in Fig. 1 passes through it. 



