Ali
' a!
with large expanded calcareous plates, contain only
a few small branched spicules ; and tbe calcareous
bodies in the AA'all of the intestine are small and
distant. Tbe perforations in tbe ovarial plates in
the female are someAvbat larger than in C . q K tp illa ta ;
and tbe ripe ova in the OA'ary appear to be considerably
larger.
The eggs, after escaping from tbe ovary, are passed
along on tbe surface of the test towards tbe mouth ;
and the smaller slightly spatbulate primary spines
wbicb are articulated to about the first three roAvs of
tubercles round the peristome, are bent iuAvards over
the m outb, so as to form a kind of open tent, in Avliicli
the young are developed directly from tbe egg without
undergoing any metamorphosis, u ntil they have
attained a diameter of about 2‘5 mms. ; they are then
entirely covered with plates, and are provided Avith
spines exceeding in length the diameter of the test.
Even hefore they have attained this size and development,
the more mature or more active of a brood may
be seen straying away beyond the limits of the
‘ nursery,’ and creeping Avith the aid of their first
few pairs of tentacular feet out upon the long
spines of their mother ; I have frequently Avatched
them return again after a short ramble into the
‘ marsnpium.’
I am not aAvare that a free psendembryo, or
‘ pluteus,’ lias been observed in any species of the
restricted family Cidaridse ; but I feel very certain
that Cidaris papillata in the northern bemispbere,
except possibly in the extreme north, has no marsupial
arrangement snch as Ave find in the Kerguelen Cidaris.
There liaA'C passed through my hands during the last
few years hundreds of specimens of tbe normal
northern form, of the Mediterranean varieties
C. lujstrix and C. affinis {siokesii), and of tbe American
C ahyssicola, from Avidespread localities and of ail
ages ; and I have never found the young except
singly, and never in any way specially associated
Avith breeding individuals.
In Stanley Harbour Ave dredged many specimens
of an irregular urchin, much resembling iu general
F.O. B a y . Kevguelen Island. Twice
appearance Brisopsis lyrifera, the common ‘ fiddle
urchin’ of the boreal province of the British
Seas, and probably to he referred to Hemiaster
philippii, Gray.
These urchins were not breeding when we were
at the Ealklands, hnt on the 9th of January, 1874, we