42 THE VOYAGE OF H.M.S. CHALLENGER. 



I shall now give an account of the characters which distinguish the individual 

 dredged at Station 152 from the typical Kolga nana. The form of the body of this 

 animal, as well as the position of the mouth, agree in most part with those of Elpidia 

 glacialis. The length is about 28 mm. and the breadth about 14 mm. The pedicels 

 are nine along each side of the ventral surface. From the incomplete state" in which 

 this individual was found, it is not possible to give a more detailed description of 

 the dorsal processes ; they seem, however, to be very insignificant, four in number, 

 and evidently arranged in a transverse row, those in the middle being largest. The 

 calcareous deposits (PL XXXIII. figs. 1, 2) of the integument consist exclusively of 

 numerous, minute spicula provided with some small spines and with an enlargement in 

 the middle ; they are either almost straight, or extremely arcuated, horseshoe-shaped, or 

 curved so as to form an angle. The perisoma seems to be destitute of net-like per- 

 forated plates, but, as they are much scattered in the typical form, they may have 

 possibly escaped my observation. 



The typical form is found in the North Atlantic Ocean near Halifax, while the other 

 lives not very far from the Antarctic circle ; whether these two forms prove to belong to 

 the same species, or, though very closely allied, are distinct, the great distance of 

 those localities are always interesting. This is not the only example among the Holo- 

 thurids from the great depths of the sea, where representatives of the same species or 

 at least of the most nearly allied forms are found in or near the Arctic Sea and also in 

 the neighbourhood of the Antarctic Ocean. 



'■a" 



Peniagone, 1 n. gen. 



Body more or less elongated, sometimes depressed posteriorly or with a narrow 

 neck-like part anteriorly. Tentacles ten. The dorsal surface with a larger or smaller, 

 branched or unbranched lobe-like appendage anteriorly, and commonly with some more 

 or less minute processes. The ventral surface with pedicels all along each side, or 

 only round its posterior half or third. Integument with several sorts of calcareous 

 deposits : four-armed bodies with one to four processes ; and three-armed ones 

 together with branched or unbranched spicula and small bodies curved in the form 

 ofaC. 



Peniagone wyviUii, n. sp. (PI. X. figs. 3, 4). 



Body slightly depressed, about twice as long as broad, broadest in its anterior part. 

 Mouth anterior, ventral. Anus posterior, terminal. The terminal part of the tentacles 

 laro-e, provided with small, branched, retractile processes. Pedicels about eight (?) along 

 each side of the ventral surface ; the anterior part of the ventral surface destitute of 



1 riEv/ec = poverty. 



