EOLIS. 



the spermatheca j i, duct of the same ; j, small accessary gland of the same ; k, anterior 

 genital artery. (The letters of this figure correspond to, and will explain those of 

 Plate 4, fig. 15.) 

 Fig. 3. Cerebral ganglions and nerves: — a, a, central or upper ganglions; b, b, lateral ganglions; 

 c, under or buccal ganglions ; d, d, gastric ganglions ; e, inner oesophageal collar; f } outer 

 ditto ; g, central ditto ; h, h, genital and cardiac nerves ; i, i, hepatic ganglions imbedded 

 in the muscles of the buccal mass ; j, j, hepatic nerves, supplying the glands of the 

 papilla: ; k, short cord uniting the same to the outer collar ; I, eye ; m, auditory capsule ; 

 1st pair of nerves supply the dorsal tentacles ; a a, ganglions at the base of the same ; 

 2d pair go to the outer lip ; 3d pair to the skin in front of the head ; 4th pair supply 

 the channel of the mouth and oral tentacles ; 5th pair go to the channel of the mouth 

 near the buccal mass ; 6th, 7th, 8th, and 9 pairs, supply the skin on the sides of the body ; 

 10th pair supply the foot; 11th pair supply the skin on the sides of the back ; 12th pair 

 supply the skin of the back next the median line. 



4. Auditory capsule, inclosing the inner capsule and otolithes. 



5. Otolithes very highly magnified : — a, one fractured by pressure. 



6. Auditory capsule with otolithe of E. picta. 



7. Eye of E. picta ; — a, optic nerve ; b, pigment cup ; c, lens ; d, cornea ; e, general capsule. 



8. Digestive apparatus of E. despecta ; letters as in PI. 7, fig. 2. 



9. A branchial papilla of E. papillosa, exhibiting the hepatic gland, &c. : — a, ovate vesicle ; 



b, gland ; c, duct ; d, wall of inner sheath. 



10. A papilla of E. Farrani, exhibiting the gland ; lettered as the last. 



11. A much enlarged representation of the upper portion of a papilla of E. papillosa : — 



a, hepatic gland ; b, vessel leading from the gland to the ovate vesicle, c ; d, orifice at 

 the apex of the papilla communicating with the ovate vesicle ; e, muscles attaching the 

 vesicle to the walls of the papilla ; /, /, inner sheath inclosing the gland ; g, g, muscular 

 bands inclosing the cellular spaces, in which the blood circulates between the inner 

 sheath (/, /) and the skin of the papilla ; h, skin of the papilla clothed with vibratile 

 cilia ; i, i, i, circular and longitudinal muscular fibres of the skin. 



12. Utriculus, or bag, from the ovate vesicle of E. papillosa, containing the supposed stinging 



bodies. 



13. Utriculus from the ovate vesicle of E. coronata, containing the stinging and other bodies. 



14. Stinging bodies of E. papillosa, with the hair-like filaments as they appear after ejection : — 



a, one of these bodies, showing two dark lines in the centre. 



15. Stinging bodies from the ovate vesicle of E. olivacea. 



16. One of the flattened elliptical bodies, contained along with the stinging bodies in the utriculus 



of E. coronata. 



17. 18. External and internal views of a horny plate of the jaws of E. papillosa : — a, cutting- 



blade ; b, fulcrum, or hinge. 

 19. Front view of the horny jaws : — a, cutting blades ; b, hinge or fulcrum. 



