OF NAUTILUS POMPILIUS. 29 
b, vulva ; c, caruncle at the root of the first branchia ; d, two pair of similar 
papille at the bottom of the branchial cavity. 1, 2, 3, three pair of slits 
(at the left side of the figure the first is to be seen ; the two others are repre- 
sented on the right side of the figure). 
Fig. 10. Head of a male Nautilus seen from above ; the hood has been divided by a 
longitudinal section ; g g are the internal labial processes ; below them, 
at the right side, is placed and partly visible at 7, the external labial 
processus. The place of it occupies at the left side a large conoid body, a; 
m m is the fringed lip inclosing the mandibles. 
Fig. 11. The conoid body of the foregoing figure, separately seen from the inner sur- 
face, together with the incumbent internal labial processus of the left side. 
Fig. 12. Lateral view of the internal labial processus of the right side, with the man- 
dibles and the surrounding lip. 
Fig. 13. Penis. A, entire ; B, a longitudinal section of it. 
Fig. 14. A portion of the circumvoluted spermatophore or tube contained in the 
bladder at the basis of the penis. 
PLATE VIII. 
. Side view of the head, the mantle f being reflected : a, hood ; b, eye; cc, 
digitations ; d d, funnel. 
Fig. 6. The same, after. removing the digitations ; c, transverse sections of their 
tentacles ; k, external labial processes; /, internal ditto; m, membrane 
>| 
oe 
On 
covering the mandibles. 
Fig. 7. The same, after removing the external labial processes, cut off at k k. 
. Caruncle at the peduncle of the eye ; organ of smell, a. 
Fig. 9. View of the inferior surface of the muscular mass of the mouth, with the 
two cushion-like incised bodies, representing here the folds between the in- 
ternal iabial processes. 
| tea 
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Leyden, 8 Dec. 1849. 
VOL. IV.— PART I. a 
