72 ECHINODERMATA. 



specimens of what I consider the same species. None were vigorous, 

 however, their survivance was very short, nor did any of them display 

 the tentacula ; those of the largest were evidently scarlet. These ani- 

 mals extended two, four, and five inches respectively, tapering very 

 gradually from near the anterior to the posterior extremity. All were 

 white, and each was characterized by five double rows of suckers, quite 

 distinct. Had they been vigorous, they would have appeared of larger 

 dimensions. 



From inability to identify the subject of these brief observations 

 with any known species ; and speaking at all times with much reserve 

 of the characters of a single specimen, unless perfect in every respect, I 

 propose to name it provisionally, Holothuria Scotica : Meanwhile, await- 

 ing the commentaries of some more fortunate naturalist. 



PLATE XII. 



Fig. 5. Holothuria Scotica contracted. 



6. The same extended in a remarkable flexure. 



PLATE XIII. Holothuria Scotica extended, and as adhering to the side 

 of a spacious glass jar. The advancing tentacula protrude, and the 

 suckers may be seen in double rows. 



4. HOLOTHURIA BODOTRI^ HOLOTHURIA (EcNus. Plate XIV. 



The first perplexity involving the naturalist on occurrence of small 

 animals, is whether they are, young or adults : and this especially among 

 the tribes which are known to undergo important changes with advanc- 

 ing age. Never having seen the subject of this paragraph under any 

 aspect but such as represented, I cannot identify it with the species of 

 Holothuriae already described.* 



* Since this was originally written, which is a number of years ago, I observe the 

 Holothuria CEcnus in the valuable work of Professor Edward Forbes on the Echinuder- 

 mata. 



