173 
istic form sufficiently well known. I may notice that I have a spec- 
imen of 124 mm diameter of test (from Pegasus Bay, Stewart Is¬ 
land), which may be a record size. Regarding the pedicellariæ a 
little additional information may be given — only dried material 
having been at my disposal formerly. The globiferous pedicel¬ 
lariæ have a short neck; the giands are double. The tridentate 
pedicellariæ in larger specimens grow to a considerable size, nearly 
2 mm length of head, and are very coarse, covered by a thick, 
dark pigmented skin. Together with this large form a smaller form 
may occur, identical with that which I have represented in the „In- 
golf“-Echinoidea, PI. XIX, fig. 7, as characteristic of Evechinus rari- 
tuberculatus Bell. I, accordingly, agree with H. L. Clark 1 ) and Far- 
quhar that this species of Bell cannot be distinguished from 
Evech. chloroticus. The small form of tridentate pedicellariæ is the 
more common in young specimens, but the large form may also 
be found even in quite young specimens of only ca. 10 mm dia¬ 
meter. On the buccal plates are found ophicephalous and triphyl- 
lous pedicellariæ, on the plates of the buccal membrane only tri - 
phyllous ones. The spicules of the tubefeet are very scarce, simply 
bihamate. The figures given by Farquhar (Journ. Linn. Soc. 
Zool. Vol. XXVI, PI. 14, fig. 9) as representing spicules of the tube¬ 
feet of E. chloroticus in reality represent plates from the supporting 
ring (the „psellion“ of Lovén) of the sucking disk. 
It may still be noticed that the spines of very young spec¬ 
imens are distinctly banded with green and white ; in such young 
specimens also the poriferous zones are white, the naked test thus 
being white with 10 radiating, dark green lines; also the apical 
system, excepting the outer part of the genital and ocular plates, 
is white. But already from a size of ca. 10 mm diameter the test 
has the characteristic uniform green colour. The genital openings 
do not begin to form till a rather late stage; I have found the 
first indication thereof in specimens of ca. 20 mm. In a specimen 
of only 6 mm diameter Oc. I hardly reaches the periproct as yet; 
in a specimen of 8 mm already Oc. I is broadly in contact with 
and Oc. V just reaching the periproct. 
x ) Also in regard to the use of the names Evechinus and Heliocidaris I agree 
with Clark and Doderlein. 
