12 HJ. THEEL, PRELIMINARY REPORT ON THE HOLOTHURIDA. 
Ilyodgemon maculatus sp. nov. 
Plate I, Figs. 9—11. 
Body of almost equal breadth throughout, about thrice as 
long as broad. ”Tentacles of almost equal size, with large cir- 
cular discoidal ends, bearing at their edge alone small rudi- 
mental processes; the ventral tentacles of one individual a little 
smaller, and one tentacle of another individual destitute of the 
discoidal end and pointed. Pedicels varying in number; in one 
individual twenty-three along each side of the ventral surface, 
in another twenty-nine along the left side, and about as many 
along the right; generally they are large and long, the po- 
sterior alone are much smaller. Pedicels of the inner row appa- 
rently alternating with those of the outer. Processes of the 
bivium very numerous and close-set, cylindrical or fusiform; the 
longest as long as the breadth of the body. Back naked along 
its middle between the processes of both the ambulacra, except 
on its anterior part a little behind the tentacles, where there is 
a smaller process. Integument thick and soft, with three sorts 
of very numerous calcareous deposits: 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 irregu- 
larly rounded flat discoidal plates, dichotomously branched, nearly 
of the size of the small wheels, crowded in large numbers in 
several places. Wheels concave, felly directed outwards, 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 gray, with scattered white spots 
from crowded calcareous deposits; back and sides with numerous 
small dark red or brown points and spots; processes with a red- 
dish band and frequently with dark red tops. Terminal parts 
of the tentacles brown. 
Length, about 130 mm. 
Breadth, about 45 mm. 
Station 209, 100 fathoms, three specimens. 
Station 219, 150 fathoms, two specimens. 
