REPOUT 01 ^ THE HOLOTHUEIOIDEA. 
61 
anterior extremity of the body, and in some individuals from Station 313 they 
communicate with the radial muscular bands at its middle. The calcareous rins^ is very 
narrow and fragile ; when treated with a solution of potash it does not separate into 
distinct pieces, but seems to form a continuous whole. Anteriorly, it sends out ten 
comparatively long processes, of which the five radial are slightly enlarged at the tops 
and notched. The reproductive organs consist of two fascicles of long, slender, simple 
tubes, and its long efferent duct opens in a small papilla situated far behind the tentacles. 
Besides the two longer respiratory-trees, often one or twm shorter ones are present. 
The above description refers to the specimens dredged at Station 315. That obtained 
at Station 316 is totally devoid of any calcareous deposits, these having been probably 
dissolved by means of some impurity in the alcohol. The individuals, on the contrary, 
brought home from Stations 313 and 314 are remarkable for havinu the iiiteaument 
supported by some very scattered, irregular or almost round, perforated plates and more 
numerous larger and smaller spicules with the ends branched or perforated, resembling 
those found in the pedicels of the individuals from Station 315. The larger spicules 
measure as much as 0’22 mm. in length, the smaller about 0'08 mm., and the plates have 
a diameter of about 0'2 mm. or more. The plates as well as the rods are more or less 
spinous. In the individuals dredged at Station 313 the deposits are in a state of solution ; 
which consideration renders it rather probable that the individuals from Station 315 have 
also been in possession of deposits in the body- wall, though they are dissolved. If this be 
so, I cannot conceive how it is possible that the terminal plates of the pedicels have been 
left. However, I have more than once observed that the calcareous ring as well as the 
deposits of the pedicels become dissoHed later than the deposits of the body-wall itself 
Cucumaria crocea, Lesson, seems not to be identical with Semper’s Cuciimaria 
godeffwyi, but both forms are doubtless nearly allied to each other. 
Cucumaria mirahilis, n. sp. (PI. IX. fig. 5). 
Body tapered towards each extremity, curved, with the convex ventral surface longer 
than the concave dorsum. Tentacles small, ten in number. Pedicels mainly belonging 
to the ambulacra, two or three rows in each, besides some scattered pedicels in the inter- 
ambulacra. Excepting these pedicels, some slightly larger elongate conical processes 
are to be found on the ventral ambulacra. Deposits — crowded tables consisting of an 
irregularly perforated rounded or angular disk with uneven margin and a short spire built 
up of only two short rods ; the top of the spire terminates in several spines ; pedicels and 
processes with transformed, rod-like tables. Colour in alcohol, light yellowish-grey. 
Length about 12 mm. (in contracted state). 
Habitat. — Zebu (Philippine Islands); depth, 100 fathoms; one specimen. Port 
Jackson (Australia) ; depth, 6 to 15 fathoms ; one specimen. 
