PLATE III. 
Fig. 1. Cuvierina columnella. 
Fig. 1. Central nervous system, from the ventral surface ; a, pedal ganglion ; b, right visceral ganglion ; c, left 
visceral ganglion ; d, otocyst ; e, second pedal commissure ; 1, right pallial nerve ; 2, 3, visceral 
nerves ; P left pallial nerve. 
Fig. 2. Cavolinia longirostris. 
Fig. 2. Ventral aspect, the mantle having been removed from this side; a, retractor or columellar muscle; 
a', its left anterior branch ; b, fin ; c, oesophagus ; d, stomach ; e, intestine ; /, liver ; g, genital 
gland ; h, vesicula seminalis ; i, accessory genital glands ; j, genital duct. 
Fig. 3. Cavolinia quadridentata. 
Fig. 3. Ventral aspect of the digestive tract; a, buccal mass; b, salivary gland; c, oesophagus; d, stomach; 
e, caecum ; /, intestine ; g, right lobe of the liver ; h, its duct ; i, left lobe of the liver ; j, its duct. 
Fig. 4. Cavolinia injlexa. 
Fig. 4. Generative organs, seen from the right side ; a, genital gland ; b, genital duct ; c, vesicula seminalis ; 
d, accessory genital glands ; e, genital orifice ; /, spermatic groove. 
Fig. 5. Cavolinia tvispinosa. 
Fig. 5. Horny spicule from the penis. 
Fig. 6. Limacimdse and Cavoliniidse. 
Fig. 6. Comparative diagrams of the organisation of the Limacinidae and Cavoliniidas, the animals being seen 
from the cephalic extremity : — A, Limacinidae ; B, Cavoliniidae. The following letters have the 
same significance in the two diagrams ; a, oesophagus ; b, stomach ; c, bile-duct ; d, posterior 
azygous gastric plate ; d', anus ; e, origin of the genital duct ; /, genital orifice ; g, pallial gland 
(shield); h, pallial cavity. 
Fig. 7. Cymbulia peroni. 
Fig. 7. Anterior aspect, the fin having been cut through ventrally and laterally ; a, head with the two 
tentacles; b, fin; c, “shell”; d, pallial cavity; e, visceral mass and anus; /, pallial gland 
(shield). 
Figs. 8-11. Cymbulia. 
Fig. 8. a, Pallial gland ; b, outline of the shell. 
Fig. 9. Ventral aspect of the generative organs, the accessory glands being reflected to the left side; 
a, genital gland ; b, genital duct ; c, receptaculum seminis ; d, muciparous gland ; e, albumini- 
parous gland ; /, genital orifice. 
Fig. 10. Ventral aspect of the central nervous system; a, cerebral ganglion; b, pedal ganglion; c, right 
visceral ganglion ; d, posterior visceral or abdominal ganglion ; e, left visceral ganglion; /, otocyst ; 
g, nerves to the fin ; 1, right pallial nerve ; 2, 3, visceral nerves ; 4, left pallial nerve. 
Fig. 11. Lateral view of the central nervous system; a, cerebral ganglion; b, pedal ganglion; c, right visceral 
ganglion ; d, posterior visceral or abdominal ganglion ; e, cerebral commissure ; /, otocyst ; g, nerves 
to the fin ; h, oesophagus ; 1, left pallial nerve ; 2, 3, visceral nerves. 
Fig. 12. Gleba cordata. 
Fig. 12. Anterior view of the larva; a, buccal aperture; b, penis; c, posterior lobe of the foot. 
