195 
— as is also plainly seen in his PI. XV, Fig. 12 — remarking that 
my statement seems inexplicable. I may take the opportunity of 
asserting here that the specimen examined by me has, indeed, five 
ambulacral plates reaching within the fasciole. The specimen, which 
was sent me under that name by Alcock himself, may, however, 
more correctly be referred to Br. bengalensis Koehler (it resembles 
very much his PI. XV. Fig. 1); but this does not do away with the 
discrepancy, as also this latter species has only 4 plates reaching 
within the fasciole. I do not see how to reconcile these facts; per¬ 
haps my specimen is just an individual variation. Another point to 
which I may call attention is the different shape of the petals in 
the two specimens of Br. Oldhcuni figured by Koehler in his work 
quoted above, PI. XIV, Figs. 1 and 2. I would rather say that the spec¬ 
imen Fig. 1 has divergent posterior petals — in faet, were it not for 
the different number of plates included within the subanal fasciole I 
would be very much inelined to regard the New Zealand specimens 
as identical with the species figured there. An extensive material 
\\ ill be needed for the solution of these problems; but that must be 
reserved for future studies. 
Explanation of the Plates. 
Figs. 1-2. 
— 3 . 
— 4-6. 
- 7. 
— 8 - 10 . 
— 11 - 12 . 
— 13-15. 
Plate VI. 
Goniocidaris umbraculum Hutton. Showing different degree of 
widening of the apical radioles. Vi. 
Ogmocidaris Benhami n. g., n. sp. 1 /i. 
denuded test, seen from the aboral (Fig. 4) 
and oral side (Fig. 5) and in side view 
(Fig. 6). Vi. 
Noiechinus novæ-zealandiæ n. sp. Vi. 
denuded test, seen from the aboral (Fig. 
8) and the oral side (Fig. 9) and in side 
view (Fig. 10). Vi. 
Pseudechinus albocinctus (Hutton), from the oral (Fig. 11) and 
aboral side (Fig. 12). Vi. 
denuded test from the aboral side (Fig. 13), 
in side view (Fig. 14) and from the oral 
side (Fig. 15). Vi. 
13 * 
