hyndman's sea-cucumber. 225 



HOLOTHURIADJE. PENTACTM. 



HYNDMAN'S SEA-CUCUMBER. 

 Cucumaria Hyndmawihi. Thompson. 



Specific Character. — White, five-angled ; skin smooth ; a double close row of 

 large (non-retractile ?) suckers on each angle ; tentacula ten, sessile, white* 

 plumose. 



HolotAuria Hyndmanni, Thompson, An. Nat. Hist. vol. V. p. 100. (April 



1840.) 



This very pretty species, two inches in length, was 

 dredged in Belfast Bay, by Mr. Hyndman of Belfast, 

 whose natural history researches well entitle him to the 

 compliment paid by Mr. Thompson in associating this 

 Holothur'm with his name. Besides the characters men- 

 tioned in the specific diagnosis, Mr. Groodsir found it to 

 present, when dissected, the following anatomical ap- 

 pearances. 



The dental apparatus consists of ten plates, which are 

 composed of twenty white chalky triangular pieces ar- 

 ranged in pairs. The retractile muscles of this apparatus 

 are short, ovate, and attached posteriorly a little behind 

 the mouth. The canal surrounding the attachment of 

 the oesophagus bulges out between each of the ten plates. 

 To this circle or canal there is attached a sac of a cylin- 



Q 



