Bd. VI: 4) 
THE ECHINOIDEA. 
7 
hand it is not probable that tridentate pedicellariae will occur, in view of the fact 
that this form of pedicellariae has not been found either in any of the related 
genera, Notocidaris , Rhynchocidaris , Austrocidaris and Eurocidaris. 
The spicules of the tube-feet are of the usual shape and arranged in the usual 
manner, so as to leave a bare space for the tentacle nerve. The walls of the in- 
testine contain more or less numerous, small, irregular, more or less elliptical cal- 
careous corpuscles (Fig. 2). The organs of Stewart do not seem to contain any 
spicules. The genital organs contain only very few 
spicules, mainly of the same shape as those of the 
intestine. 
As might be expected from the size of the female 
genital opening, the eggs are very large, ca. 1.5 mm. 
diameter, and rather few in number. It may be con- 
cluded with certainty that this species has not pelagic 
larvæ. Probably it will also prove to have some sort 
of care of the brood. I have, however, been unable 
to find the young on any of the available specimens. 
The colour is dark purple, viz. the secondary spines 
and the test, which latter is covered by a thick skin 
in which the chromatophores are found. The radioles 
are white, with a faint tint of violet at the base, and 
stand out very beautifully from the dark ground-colour 
of the test. It is, however, rather seldom that the natural colour of the radioles is 
seen. Generally the radioles are covered by a profusion of foreign organisms: 
sponges, a Bryozoan (of the genus Alcyonidium), which wholly invests the radioles 
in a thick layer of its soft matter (PI. I) or a small, white bivalve Mollusc (PI. II) 
which proves to be viviparous; this fact accounts for the enormous numbers occur- 
ring on some specimens, the young ones taking their place on the same host as the 
parents. According to Mr. H. Lynge it belongs to the genus Limopsis , being nearly 
related to, but specifically distinct from the L. straminea Smitei from Kerguelen. 
Several specimens were taken of this beautiful and interesting species, viz. 
St. ii (65° 19' Lat. S. 56° 48' Long. W. 400 meter. Graham Region). 1 small specimen. 
» l 7 ( 53 ° 34 " Lat. S. 43 0 23' Long. W. 160 meter. Shag Rocks Bank). 10 large, 
5 small specimens. 
» 22 (54 0 17' Lat. S. 36° 28' Long. W. 75 meter. South Georgia). 1 specimen 
(Comp, below, p. 9). 
» 34 (54 0 1 1 ' Lat. S. 36° 18' Long. W. 252—310 meter. South Georgia) 
7 small specimens. 
Fig. 2. Spicules from the walls of 
the intestine; drawn in their 
natural position. I25 /i. 
I large, 
