THE APODOUS HOLOTHURIANS 163 



in other members of the genus more or less yellowish brown, brownish red, or 

 dark violet, according to the individual; the color of the body varies evidently 

 with the development of the phosphatic deposits; the caudal appendage is 

 always white or whitish. 



DISTRIBUTION. Reported from New Guinea (Lampert) ; Andaman Sea 

 (Walsh); four of the "Siboga" stations in the East Indies (Sluiter), and six 

 of the "Investigator" stations in the Gulf of Bengal and near Ceylon (Koehler 

 and Vaney). 



REMARKS. Although Walsh considered this species near to antarctica, and 

 Sluiter, and Koehler and Vaney regard it as nearly related to granulata, it ap- 

 pears to be quite distinct from either, and well 'characterized by the presence 

 of the phosphatic deposits and the peculiar but well-formed tables of the 

 caudal region. Considering the meagerness of Walsh's description and the ab- 

 sence of any figures, it is not strange that Sluiter failed to recognize andaman- 

 ensis in his East Indian specimens. There can be little question, however, of 

 the identity of the two forms; nor can there be much doubt that the little 

 "Trochostoma" from New Guinea brought home by the "Gazelle" and con- 

 sidered by Lampert ('89) to be antarctica, really is andamanensis. 



MOLPADIA SIMILIS. 



PLATE X, FIG. 16. 



Ankyroderma simile Theel, 1886a, p. 40; pi. xi, fig. 2. Calcareous particles, pi. n, 

 fig. 5. 



LENGTH. 100-110 mm. 



COLOR. Dirty gray and yellowish brown. 



DISTRIBUTION. Reported only from Yokohama, Japan, 621 m. (Theel). 



REMARKS. This is one of the species known from only a single specimen, but 

 it appears to be quite unique, unless indeed it should prove to be the adult of 

 roretzii; the small size of the tables is a striking point of resemblance between 

 the two. 



MOLPADIA AFFINIS. 



Ankyroderma affine Danielssen and Koren, 1879, pp. 133-137; pis. v and vi, figs. 

 22-28. 



LENGTH. 50-75 mm. 



COLOR. Gray or grayish green ; the oral disc and caudal appendage whitish. 



DISTRIBUTION. Reported from north of Norway (Danielssen and Koren) ; 

 Kara Sea (Clark, antea) ; and Caribbean Sea (Theel). The range possibly coin- 

 cides with that of oolitica. 



REMARKS. I was at first inclined to consider this species as simply a form 

 of oolitica or possibly arctica, but the calcareous tables H ^em to be quite 



