REPORT ON THE HOLOTHURIOIDEA. 85 



numerous : large wheels, 0'14 mm. in diameter, and with about nine spokes ; small wheels, 

 0-036 mm. in diameter, and with about twelve spokes; and irregularly rounded flat 

 discoidal plates, dichotomously branched, nearly of the size of the small wheels, crowded 

 in large numbers in several places. Wheels concave, with the felly directed outwards, 

 and the nave towards the inside of the body; between the large and small wheels there 

 are many forms, varying much in size and shape. 



Colour in alcohol, white grey, with scattered white spots caused by the crowded 

 calcareous deposits ; back and sides with numerous small, dark red, or brown points 

 and spots ; processes with a reddish band and frequently with dark red tops ; terminal 

 parts of the tentacles brown. Length, about 130 mm. Breadth about 45 mm. 



Habitat. — Station 209. January 22, 1875. Lat. 10° 10' N., long. 123° 55' E. 

 Depth, 95 to 100 fathoms; bottom temperature, 21 "7° C. ; mud. Three specimens. 

 Station 219. March 10, 1875. Lat. 1° 50' S., long. 146° 42' E. Depth, 150 fathoms; 

 mud. Two incomplete specimens. Station 192. September 26, 1874. Lat. 5° 42' S. ; 

 long. 132° 25' E. Depth, 129 fathoms ; mud. Two individuals. 



The individuals obtained at Stations 209 and 219 are extremely incomplete, having 

 the alimentary canal totally destroyed and various portions of the body-wall torn 

 quite in pieces. Only a single specimen is in such a state of preservation that it is 

 possible to get a correct idea of its general appearance. After finishing the examination 

 of those individuals, I obtained two specimens from Station 192 in a rather more 

 complete state. The body appears to be almost equally broad throughout, becoming 

 slightly wider and more evenly rounded anteriorly than posteriorly ; the back is very 

 convex, while the ventral surface is nearly flat. The mouth is on the ventral sur- 

 face, and the anus is terminal and situated above the posterior pedicels and ought 

 consequently to be regarded as belonging to the dorsal surface. The tentacles seem as a 

 rule to be of equal size, though the ventral ones are sometimes slightly smaller ; 

 their free end is almost discoidally dilated, about 7 mm. in diameter, and forms a 

 sharp edge which obviously separates the end itself from the supporting stem. This 

 edge (PI. XLIV. fig. 11) is crenulated with minute incisions and lobes, and on its 

 outer side a more evident incision is often seen. As in Lcetmogone, the tentacles 

 seem to want true processes. One of the dorsal tentacles of one individual is incom- 

 pletely developed, its terminal part being acute. 



The largest individual, measuring 130 mm., has twenty-nine pedicels along the left 

 side of the ventral surface, and probably about the same number along the right, 

 though I feel somewhat uncertain concerning it, as a portion of this side is torn off. 

 Another individual carries about twenty-three pedicels along each side, while a 

 third specimen gives off twenty-six along the left and twenty-four along the right 

 side of the ventral surface. Both of the specimens from Station 192 are likewise 

 supplied with a variable number of pedicels, one possessing eighteen along the left 



