MILK-WHITE SEA-GIRKIN. 231 



IIOLOTIIURIAD.K. PENTACTM. 



/W\ 



MILK-WHITE SEA-GIRKIN. 

 Ocnus lacteus. Forbes and Goodsir. 



Specific Character. —Colour milk-white ; tentacula short, triangular, pinnate. 

 Hulothuria lactea, Forbes and Goonsm, Athenaeum, No. 618. 



A second species of Sea-Girkin was found by Mr. 

 Goodsir and myself in the Sound of Bressay, Shetland, 

 at the same time with the various Sea-Cucumbers which 

 we have described from that quarter. The one before us 

 is a very pretty species. It is small, the largest examples 

 being not more than three-fourths of an inch in length. 

 The body is of nearly the same thickness throughout, 

 cylindrical, and five-angled. On each angle there is a row 

 of prominent non-retractile suckers. The rows appear 

 single in consequence of the distances between the alter- 

 nating suckers, which are from seven to nine in each. 

 The posterior and anterior extremities seem as if trun- 

 cated ; the latter bears the tentacula, ten in number, short, 

 pyramidal, and pinnate. The entire animal is of a white 

 colour. 



Mr. Goodsir and I opened all our specimens of this 

 animal, save two, without finding any traces of respiratory 

 organs, and but few of genital. In two specimens, how- 



