REPOET OX THE HOLOTHURIOIDEA. 
63 
double row along each ambulacrum. The iuterambulacra naked. Integument rather 
hard, with numerous deposits — small irregular, slightly concave, cup-like, perforate 
bodies with spines on the concave and knobs on the convex surfaces ; closely disposed 
buttons’ of various shape, the more regular with about four holes and a smaller number of 
larger knobs ; and large, scattered, thick, almost scale-like, round, elongate or oval plates 
with numerous holes and knobs. Pedicels strengthened by transverse plate-like rods 
vith holes and a few knobs. Terminal plates less developed. Colour in alcohol, light 
grepsh. Length about 53 mm. 
Habitat. — Station 141, December 17, 1873 ; lat. 34° 41' S., long. 18° 36' E. ; depth, 
98 fathoms; bottom temperature, 49°'5 ; green sand; a single specimen. Station 
142, December 18, 1873; lat. 35° 4' S., long. 18° 37' E.; depth, 150 fathoms; bottom 
temperature, 47°'0 ; green sand ; two specimens. 
The calcareous ring (PI. V. fig. 2, e) is slender, of common form, without posterior 
prolongations. A single Polian vesicle and madreporic canal are present. The slender 
retractors are attached at about the first fourth of the body. The reproductive organs are 
composed of simple imbrauched tubes. The respiratory-trees are not very richly j^rovided 
with branches. The integument is not very thick or hard, and contains a multitude of 
deposits ; the larger deposits communicate to the surface of the skin a punctulate 
aspect. 
The flat cups (PI. Y. fig. 2, a) are situated in the exterior layer of the perisoma, and 
present themselves under very variable aspects ; sometimes they are simply cruciform, 
mostly, however, plate-like, with two to five holes. Their upper, concave surface is 
always provided with spines, while the inner surface carries some knobs. Their diameter 
measures as much as 0’04 mm. The buttons (PL V. fig. 2, b) even vary greatly as to their 
shape, some being oval symmetrical, others, on the contrary, very symmetrical, with a 
greater number of lobes and knobs. The smaller, symmetrical, true buttons measure as 
much as OT mm. in length. The scale-like plates (PI. V. fig. 2, c) are not closely 
crowded as in the former, but scattered, and attain a considerable size, up to 0‘8 mm. in 
diameter. They are firmly constructed, thick, with numerous holes and knobs. A 
series of transitional forms between the buttons and plates are to be found. The pedicels 
carry numerous, knobbed or smooth, perforated plates, and, 2 :)late-like, more or less curved 
rods (PI. V. fig. 2, d). The terminal plates seem not to be very well developed. 
As far as I can find, this species cannot be referred to any oihex Cucumana before 
known ; it bears, indeed, some resemblance to Cucuinaria planci and Cucumaria syra- 
cusana, but the former seems to be in want of the large plates, &c., and the latter carries 
pedicels even on the interambulacra, &c. It may even appear as if this species is very 
nearly allied to Cucumaria discolor, which has been brought home from nearly the same 
locality, but the latter is distinguished Iry the stellate mouth, tbe almost equally large 
tentacles, the rounded cylindrical body-form, the very thick, leathery perisoma, and by 
