34 6 Dr. Johnson's observations &c. 
c refers to the root or the expanded part of the tongue, or 
what, more properly speaking, constitutes the oesophagus. 
Fig. 6. Shows the arched back the G. tuberculata presents, 
when in motion. 
Fig. 7. Shows the abdominal pouch of this animal with the 
young affixed to it by their tail, enjoying free motion with 
the rest of the body. 
Fig. 8. Its appearance when about to deposit its ova ; a , the 
mouth ; b, the contracted portion containing the ova to be then 
excluded ; c, the remaining portion of the ova left in the ab- 
dominal cavity; d, the tail. 
Fig. 9. The G. tuberculata magnified, showing, a, the 
tubular tongue ; b , the eyes ; c, the double longitudinal row 
of white tubercles; d, the serrated margin; e, the anus. 
Fig. 10. The back part of the same animal, showing, a, the 
tubular tongue projected from the mouth ; b, the oesophagus ; 
c, the abdominal foramen ; d, the alimentary canal or sto- 
mach ; e , the lateral cells of the stomach ; f, the two last 
long cells ; g, the intestine ; h , the sucker, or tail. 
Fig. 11. G. punctata, natural size, front view. 
Fig. 12. Ditto, back view. 
Fig. 13. The same animal, magnified, showing, a, the 
projectile tubular tongue; b, the eyes; c, the abdominal 
pouch; d, the tail ; e, the serrated margin. 
