REPORT ON THE HOLOTHURIOIDEA. Ill 



Habitat.— Station 274. September 11, 1875. Lat. 7° 25' S., long. 152° 15' W. 

 Depth, 2750 fathoms ; bottom temperature, 0*9° C. ; racliolarian ooze. One individual. 



The mouth is situated 20 mm. behind the anterior extremity of the body. The pedicels 

 of the odd ambulacrum are from thirty to forty in number. The dorsal processes, from 

 3 to 4 mm. long, do not seem capable of being retracted, and are disposed twenty-three 

 along the left ambulacrum, and about twenty-one along the right one. 



The calcareous deposits of the integument are entirely dissolved, but to judge from 

 the remaining membranes which surround them, they ought evidently to have been four- 

 or three-armed bodies. The madreporic canal seems to pierce the body-wall. The Polian 

 vesicle is single. The cloaca is rather considerable. The reproductive organ, about 

 30 mm. long, consists of two fascicles of very small, slightly elongated dichotomous caeca ; 

 its aperture is situated from 28 to 30 mm. behind the anterior extremity of the body. 



Tabulae view of the Species of the Genus Benthodytes. 



I. Tentacles twenty. 



A. Integument with numerous crowded papillse on the back ; no dorsal) 



... f Benthodi/tes wmilHfem. 



processes (?), . . . . . . .) 



P>. Integument without papillse ; about eight minute processes arranged' 



along each of the dorsal ambulacra, 



> Benthodytes typica. 



II. Tentacles eighteen : dorsal processes numerous, minute and retractile, scattered) , . 



,,,..,, c Benthodytes sanguinolenta. 



over the lateral mterarnbulacra, . . . . . .) 



III. Tentacles fifteen. 



A. Dorsal processes arranged in a single row along each ambulacrum — 



a. All dorsal processes minute, ..... Benthodytes abyssicola. 



b. Three pairs of the dorsal processes comparatively large, . Benthodytes sordida. 



B. Dorsal processes arranged in an irregular double row along each) 



° > Benthodytes mamilhfera. 



ambulacrum, -.......> 



TV. Tentacles twelve (?) ; dorsal processes arranged in an irregular double row along) 



each ambulacrum, . . . . . . . .' 



