Helicolinax Lamarckii. 313 
Fig. 3. The same laid open to shew the introsusception of the upper 
portion. The letters have the same signification. 
Fig. 4. The same view as Fig. 3, of a specimen in which the mass of 
the mouth was exserted, together with the ganglions of 
the nervous cord. 
CEsophagus. 
Lower portion of stomach. 
Right cerebral ganglion. 
Left ditto. 
Great ganglion formed by confluence of two lateral gan- 
glions. 
z.z. Nerves of great tentacula. 
Fig. 5. Tooth from upper part of the mouth. 
Fig. 6. Organs of generation. 
External pouch. 
Penis. 
Retractor muscle. 
Muscular body, into which run the matrix and ‘ vessie.’’ 
Vas deferens, 
Vessie. 
Tubes of ditto and matrix, of which that on the right 
belongs to the matrix. 
Large lobe of testicle. 
Oviduct. 
Large lobe of liver containing the ovary. 
Matrix. 
Fig. 7. Upper part of the same as the last seen from behind. The 
letters have the same signification. 
Fig. 8. The upper part laid open from the same side of Fig. 6, which 
P 
is the upper side with respect to the animal. 
Tube of penis prolonged within the external pouch. 
Tube of vessie. 
Orifice to matrix. 
The other letters as before. 
