ACTINOPODOUS HOLOTHUPJOIDEA. 



187 



Description: — Tentacles 15 (in one specimen only 10, in 

 unotlier IG). One specimen measured when fresh was 3 cm. long 

 and 1 cm. broad. Dorsum vaulted, vontrum Hat. The perisome 

 is coloi'less, the tentacles are brownish, and the viscera have in 

 general the same color, but are in some parts tinged with green. 

 Each of the dorsal ambulacra has a row of papillae 11 to 17 in 

 number. The pedicels belonging to the lateral ambulacra are 

 very numerous and slender. They go around the anterior end of 

 the body, and do not seem to be very long. They form, at least 

 in tire middle of the body, a double alternate row, but in the 

 smallest specimens tliey are in a single row. The median ven- 

 tral ambulacrum is devoid of any ai^pendage. 



Calcareous deposits are not very numerous. Subjected to a 

 rigorous search, the deposits could be discovered only in tlie dor- 

 sal papilkc, lateral pedicels, and on the tips of the tentacles. I 

 can discover no large w^heels such as are found in other species 

 of Lcetmogom. The deposits that are found on the papillae and 

 pedicels are small wheel- shaped plates and bent supporting rods. 

 Small wlieel- shaped plates are very much like those described under 

 tlie same name by Thkel in Pannychia moseleyi, or the " Ciitter- 

 plattchen " described by Lrinvic in Latmophasma feciindiim. They 

 are most distinctly wheel-like in tlie dorsal papilke. There are 

 four primary opening.-:, around wliich there is a circle of 



