BROWN SEA-GIKKIX. 229 



HOLOTHURIADM. PENTACTJE. 



Genus Ocnus. Forbes and Goodsir. 



Generic Character. — Body regular, cylindrical, pentagonal, with five rows of 

 distant suckers on the angles ; tentacula ten ; dental apparatus very short (a 

 gizzard). 



BROWN SEA-GIRKIN. 



Ocnus brunneus. Forbes. 



Specific Character. — Colour brown ; tentacula long, pedicled, pinnate. 



Holothuria brunnea, Forbes, MS. Thompson, Annals of Natural History, 

 No. 29. April 1840. 



The animals to which we have applied the name of 

 Sea-Girkins, differ from the Cucumariee, externally, in the 

 very few suckers which crown their angles, and, internally, 

 in having- a strong muscular gizzard. In their motions 

 they differ also very considerably, not constricting them- 

 selves, and blowing themselves up as the Sea-Cucumbers 

 do, but elongating themselves like worms, to which ani- 

 mals they approximate in their movements. Their suckers 

 are exceedingly strong, and always exserted, few in num- 

 ber, and appearing as if ranged in a single line. Two 

 species, both of which seem to have escaped the observ- 

 ations of British naturalists till lately, are found in our 



