EEPOET 01^ THE HOLOTHIJEIOIDEA. 
69 
“teeth” round the anus; the former resemble small undeveloped pedicels, the latter 
have the shape of rather large perforated plates with the margin very uneven, spinous. 
Commonly the deposits in the anal portion of the body are more crowded. 
Only a single madreporic canal and Polian vesicle are present. The calcareous ring 
seems to be of about the same conformation as that in Cucumaria abyssorum, though 
in a lower state of development. The retractors are very short, only 4 or 5 mm. long. 
A well-developed muscular stomach is present. The genital tubes are short, simple, and 
collected into two bundles, one at each side of the mesentery. The respiratory-trees 
have short, scattered branches, all over their length. 
The two specimens brought home from Station 300 are slightly larger, about 
40 mm. long; and the surface of their perisome is very rough, almost spinous, from 
the large outwardly directed spinous processes which are visible to the naked eye. 
Cucumaria herguelensis, n. sp. (PI. XII. figs. 6, 7). 
Body fusiform, more tapered posteriorly. Tentacles ten, two ventral considerably 
smaller. Anus with minute teeth. Dorsal surface with pedicels distributed without 
order all over its ambulacra and three interambulacra ; only anteriorly and posteriorly an 
arrangement in rows is discernible. Ventral surface with close-lying pedicels arranged in a 
double row along each ambulacrum ; its interambulacra are well marked, naked, excej^ting 
anteriorly and posteriorly, where some small pedicels are present, making the arrange- 
ment in rows there less distinct. The outer or rather upper series of the two lateral 
double rows of pedicels is, however, not very well marked out. Deposits — scattered 
minute x -shaped bodies ; and crowded, irregular, angular, rounded, oval or elongate, 
perforated plates, with uneven margin, numerous holes and more and less prominent 
knobs. The most highly developed plates almost resemble scales with their upper surface 
convex and knobljed. A whole series of developmental stages from simple x -shaped 
deposits are to be found. Colour in alcohol, light yellowish-grey. Length, 7 5 mm. 
Habitat. — Station 149b, January 17, 1874 ; lat. 49° 28' S., long. 70° 30'E.; off Eoyal 
Sound ; depth, 25 fathoms ; volcanic mud ; six specimens. 
The body seems often to be slightly curved, with the anus bent upwards and the dorsal 
surface shorter than the ventral. In the foremost part of the body the pedicels are 
collected in five groups, consecjuently a tendency to an arrangement in rows of the dorsal 
pedicels is here traceable. Even posteriorly it is not difficult to distinguish the five 
rows. But for the rest, the pedicels are equally scattered over the dorsal surface. All 
the pedicels do not appear to be of equal size, some being considerably smaller. 
The calcareous ring is small, of the ordinary shape, and its posterior margin is undulated 
without processes ; the radial pieces are notched anteriorly and have about the same 
height as the interradial, 2 mm. A single Polian vesicle and madreporic canal are present. 
