REPORT ON THE HOLOTH CJRIOIDEA. 
163 
two or three rows, the middle one of five or six. The dorsal papillae are small and 
fully retracted, and therefore their true disposition is not discernible in the very con- 
tracted and wrinkled specimen. A single madreporic canal and Polian vesicle are 
present. The calcareous ring is like that figured by Semper. The forms of the 
deposits are shown in the figures, and seem to agree with those of Semper. The 
C-shaped bodies (PI. YII. fig. 7, e) are numerous and of very unequal size, some being 
small, others large; usually their length reaches as much as 0'06 mm. The rosettes 
or dichotomously branched bodies (PI. VII. fig. 7, d) are small, measuring about 
0-3 mm., and the tables (PI. YII. figs. 7, a, h, c) have a height of about 0'032 mm. 
The pedicels are strengthened by spinous rods (PI. YII. fig. 7,/), commonly enlarged 
and perforated at the middle, and even the papillee are provided with numerous crowded, 
slightly curved, spinous rods. 
Stichopiis diallengeri, n. sp. (PL X. fig. 21). 
Body elongated, cylindrical, more tapered posteriorly than anteriorly, slightly 
flattened. Mouth ventral, surrounded by nineteen tentacles. Anus terminal. Ventral 
surface vdth three longitudinal series of cylindrical pedicels, the two lateral series 
composed of two rows, the middle broader one of two to four rows. Dorsal surface 
with elongated, conical processes scattered over the ambulacra and interambulacra ; 
an arrangement of them in rows is scarcely to be found elsewhere than along the sides 
of the body, where they evidently belong to the lateral ventral ambulacra, Body-wall 
thin and pliable, with scattered deposits, composed of three to four arms and a central 
column terminating in a few small teeth ; the arms are mostly bifurcate at the ends, 
but sometimes perforated. As a rule, the deposits are not very symmetrical. The 
pedicels and processes are supported by numerous spinous, slightly curved rods, and 
the former bear a well-developed terminal plate. Colour in alcohol, grey inclining 
to violet; tentacles yellowish. Length, 160 mm. or more. 
Habitat . — Station 148a, January 3, 1874; lat. 46° 53' S., long. 51° 52' E.; depth, 
550 fathoms ; hard ground, gravel, shells ; a single slightly macerated specimen. 
The dorsal processes have a length of about 7 mm.; the largest are to be found 
round the anterior extremity of the body. Excepting four-armed bodies like those in 
the body-wall itself, but considerably larger and with the enlarged ends of the arms 
perforated, the processes contain numerous simple, or, more seldom, branched spinous 
spicules, which often have the ends perforated by a small hole. The top of the 
processes is supported by small irregularly branched and spinous spicules forming a 
kind of terminal plate. The cylindrical, wide pedicels, about 5 mm. long, form an 
alternating double row along each side of the ventral surface, and, also, a median 
series, composed, apparently, of about four rows of pedicels on the posterior half of 
