HOLOTHURIA. 67 



PiATE X. — The same, in an earlier stage of regeneration. Tentacula, a. 

 Posterior orifice, b. 



PL.A.TE XI. 



Fig. 1. Young Holothuriafusus. 



2. Sucker enlarged. 



3. Tentaculuni. 



4. Antennula enlarged. 



5. Spawn of the specimen, Plate IX., slightly enlarged. 



6. The same more enlarged. 



7. Lower extremity of the cylinder or case bearing the tentacula ; 



Ampulla Poliana below. 



8. Cylinder, tentacula, and intestinal organization, after having been 



discharged. 



9. Extremity of a rope of an ovarium. 

 10. The .same enlarged. 



J 1. Extremity of the ropes of an ovarium enlarged. 



12. Ova. 



13. Ova enlarged. 



14. Ova enlarged. 



15. Ova enlarged. 



16. Minute Holothuria. 



17. The same in its natural and peculiar attitude. 



Plate XII. 



Fig. 3. Arborescent apparatus. Shelly sheaths receiving the tentacula, a. 

 Ampulla Poliana below. 

 4. Intestinal organ lost along with the tentacula, which latter are 

 not represented here. Their sheaths and bases, a, h ; Ampulla 

 Poliana, c. 



§ 3. Holothuria Scotica. — Plates XII., XIII. 



From what has been already said, it is indisputable, that the his- 

 tory of the Holothuria is very imperfectly understood, that it is clouded 

 by obscurities even at the present day : Neither can we refrain from 

 presuming that these have chiefly arose from omitting to bring such 

 specimens as might be procured under immediate observation. 



