REPORT ON THE HOLOTHURIOIDEA. 37 



Mouth anterior, ventral. Anus posterior, dorsal. Tentacles of almost equal size, some 

 of the ventral ones a little smaller ; their terminal part large, brown, contracted. The 

 dorsal surface with three small processes in a transverse row anteriorly, and a little 

 behind those are two other ones, smaller, placed one on each ambulacrum. Pedicels, 

 eleven along each side of the ventral surface. Integument thin, soft, transparent ; 

 calcareous deposits of two sorts : large three-armed spinose bodies ; and small ones, in 

 the form of a C. 



Colour in alcohol, white. Length, about 50 to 60 mm. Breadth, about 24 mm. 



Habitat. — Station 156. February 26, 1874. Lat. 62° 26' S., long. 95° 44' E. 

 Depth, 1975 fathoms ; diatom ooze. One specimen. 



The only specimen I have had at my disposal is, as the figures show, considerably 

 contracted, wherefore the form of the body evidently must have been different in the 

 living state of the animal. The dorsal surface is extremely convex anteriorly, and poste- 

 riorly approaches gradually to the ventral, almost flat surface, so that the hindmost part 

 of the body becomes strongly depressed. The greatest height of the body is immediately 

 behind the crown of tentacles. For the rest, the body is of almost equal breadth, rounded 

 anteriorly, but having its posterior extremity truncated and deeply incised in the middle. 

 The species evidently bears a certain resemblance to Elpklia willemoesi as regards the 

 external form of the body. The mouth is completely ventral, but there is no doubt that 

 its position must change when the body is extended to its natural form. The anus is 

 large and dorsal in aspect, situated immediately behind the above-mentioned incision. 

 The six anterior pairs of pedicels on each side of the ventral surface are distinctly 

 separated from each other, the first being situated at some distance behind the 

 crown of tentacles. The others, which are directed backwards and closely crowded side 

 by side, are webbed together by an extension of the integument, only their tops being 

 free ; these five united pedicels form a thin fin-like lobe on each side of the above- 

 mentioned incision. In fact, the arrangement of the pedicels resembles considerably 

 that of Eljoidia willemoesi. 



In consequence of the strong convexity, which is probably derived from the con- 

 traction, to which I have alluded above, the foremost part of the dorsal surface is turned 

 downwards, and this very part bears the five small processes, of which three are situated 

 in a transverse row a little before or rather below the other two. The ends of the 

 tentacles are large, of a brownish colour, and so strongly contracted that no processes are 

 visible ; only on the outer margin is it possible to observe traces of two such. The 

 calcareous deposits (PL XXXIII. fig. 7) resemble most strikingly those of Scotoplanes 

 robusta. The three-armed bodies consist, as in that species, of three straight, spinose, 

 long arms, measuring about 0"2 mm. in length, which run out from a common centre, 

 and form with each other three angles of equal size ; those deposits are very thinly 

 scattered in the integument, while the more or less strongly C-shaped ones are much 



