34 ECHINODEEMATA. 



protruded about an inch and a quarter. Here the intestine was quite 

 yellow, and the ovarium simple white threads, or of the faintest yellow, 

 entirely empty. 



Another, which I thought a specimen of the pentades, never exposed 

 the head for five months, nor did anything farther than mere tufts in- 

 distinctly appear. A representation of this animal was executed when 

 it had been eight months in my possession, Plate XII., fig. 1. It con- 

 tracted much during the five succeeding months, and some particles, as 

 if of decomposing parts, appeared in its vessel, resembling minute white 

 scales. At length, they lay in hundreds, none exceeding half a line in 

 length. Under the microscope, they proved dark, oval, convex, and 

 drilled with holes in considerable regularity, elliptical rows being within 

 each other. Plate XII. fig. 2 ; Scales, a. One more enlarged, b. 



PLATE I. Holothuria pentactes, the Sea Cucumber, Sea Pudding, with 

 the tentacula displayed, as adhering by the suckers in its natural 

 position. 



PLATE II. 



Fio. 1. Holothwna pentactes, quiescent ; the tentacula withdrawn, and the 

 anterior extremity closed over them. Reduced from a specimen 

 twelve inches long. 



2. Young specimen. Tentacula displayed, a. 



3. Portion of a tentaculum, shewing the arrangement of the parts. 



4. Another portion of a tentaculum. 



5. A portion of the respiratory organs of a living specimen protruding 



from a rupture of the lower part of the body, a, a, a, a. 



6. Ova nearly mature. 



7. Holothuria pentactes losing the intestinal parts, by a rupture near 



the extremity of the body. Intestinal canal, a. Portion of the 

 respiratory organs, b. Tentacula contracted, c. Neck, d. 



8. Portion of the intestinal organs escaping by a rupture. Immature 



ropes of the ovarium, a. 



