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



1500 fathoms; bottom temperature, 1"4° C. ; red clay. One specimen. Station 298. 

 November 17, 1875. Lat. 34° 7' S., long. 73° 56' W. Depth, 2225 fathoms; bottom 

 temperature, 1 # 3° C. ; grey mud. One specimen. Station 299. December 14, 1875. 

 Lat. 33° 31' S., long 74° 43' W. Depth, 21G0 fathoms; bottom temperature, l'l" C. ; 

 grey mud. Eight specimens. 



The body is rather depressed, especially at the ends. In some individuals only 

 fourteen tentacles are to be found ; the fifteenth is probably torn off, which must be 

 ascribed to the macerated and incomplete state of the preserved specimens. Some of the 

 ventral tentacles are smaller than the others ; the large discoidal terminal parts are very 

 much contracted and present small protuberances round their edges. The pedicels of the 

 odd ambulacrum are minute, and when retracted scarcely discernible exteriorly. The 

 pedicels round the brim are very numerous, and present the aspect of small round or 

 conical prominences. Each of the dorsal ambulacra is provided with about forty small 

 conical processes which are disposed in a more or less distinctly alternate longitudinal 

 double row ; the circumference of these processes at their base is pretty large, but they 

 do not reach more than from 5 to 6 mm. in length. 



The calcareous substances of the deposits of the somewhat thick perisoma are totally 

 dissolved ; in the tentacles alone some traces of spicula have been discovered. The 

 strongly developed connective tissue is full of a reddish pigment, which is partly 

 aggregated, partly arranged in fine and long branched threads, which in some places 

 form clews and bear a strong resemblance to fine vessels. 



The elongated Poban vesicle attains a length of from 30 to 35 mm. The hindmost 

 portion of the intestine is dilated into a cloaca, which, however, in accordance with the 

 state of most of the forms of this genus, does not send out any csecal prolongation. The 

 madreporic canal seems to open exteriorly, though I sometimes feel uncertain concerning 

 it. The reproductive organ is composed of two small fascicles 35 mm. long, each made 

 up of a number of bundles of elongated dichotomous caeca ; its aperture is situated about 

 25 mm. distant from the anterior extremity of the body. 



The individuals dredged at Stations 295 and 298 are of a considerably lighter colour, 

 and the one which has been brought home from the latter station being a female, has the 

 cseca of the genital organ more or less globular. 



Bentlwdytes selenkiana, n. sp. (PI. XXVII. figs. 5, 6). 



Body depressed, of almost equal breadth, about twice to thrice as long as broad. 

 Tentacles twelve (?), retracted within the mouth. The dorsal surface with small conical, 

 not retractile processes, disposed in a more or less irregular double row all along each of 

 its ambulacra. Integument rather thick and leathery, with four-armed deposits, the cal- 

 careous substances of which are fully dissolved. 



Colour in alcohol, dirty brown. Length, about 125 mm. Breadth, about 45 mm. 



