32 THE APODOTJS HOLOTHURIANS 



from Station 2779 are very large and very deep purplish-red, excepting only 

 the oral disc and tail ; they thus bear a striking resemblance to some specimens 

 of oolitica. 



The general appearance of most of the specimens, in form, color, and texture 

 of skin, distinguish them at once from any other species which I have seen, and 



I 



the scattered, very imperfect tables are also quite characteristic. The species 

 is probably most nearly related to Molpadia intermedia (Ludwig), but the 

 specimens from Stations 2783 and 2784 are easily distinguished from any 

 specimen of that species which has come under my notice, while those from Sta- 

 tion 2779 were identifiable by means of the infrequent, scattered misshapen 

 tables of the body-wall. 



MOLPADIA ANTARCTICA (Theel). 



There are numerous specimens of this species, all but two from the vicinity 

 of Wellington Island, off the coast of Chile. The largest is 92 mm. long, while 

 the smallest is only 14. They all agree in having a very thin and delicate skin, 

 gray in color, but generally somewhat blotched with yellowish-brown, especially 

 dorsally and anteriorly; in some specimens there is a tinge of brown around 

 the caudal region. There are numerous calcareous deposits in the small speci- 

 mens, but in those over 30 mm. long, they are confined to the caudal region, and 

 in a specimen 35 mm. long they are scarce even there. In the large specimens 

 no trace of calcareous bodies could be found in any part of the skin. The de- 

 posits are similar to those in the following species ; the disc is in most cases 

 regular, and the spire is longest in the smallest specimens, where it sometimes 

 has as many as 7 cross-bars; in older specimens the spire of the tables is 

 shorter and it may be wanting. 



3 specimens from "Albatross" Station 2782, lat. 51 12' S., long. 74 13' 30" W., 464 m. 

 5 " " " 2783, lat. 51 02' 30" S., long. 74 08' 30" W., 220 m. 



18 " 2784, lat. 48 41' S., long. 74 24' W., 349 m. 



2 " " " 2791, lat. 38 8' S., long. 75 53' W., 1,218 m. 



28 " " 4 stations. 



MOLPADIA ARCTIC A (v. Marenzeller). 



Of this species there are three specimens before me, two of which are labeled 

 " Trochostoma boreale, Kara Sea," while the third is labeled "Trochostoma 

 arcticum, Norway." These specimens all agree in the entire absence of colored 

 bodies in the skin, and although the tables are simpler and less crowded in the 

 specimen from Norway than in the others, I am not able to separate them sat- 

 isfactorily. They have the thin skin characteristic of arctica, and I have no 

 hesitation in referring them all to that species. Whether arctica is really dis- 

 tinct from borealis (oolitica) is still an unsettled point; so far as I know, con- 

 necting forms have not been recorded as yet. 



