166 
quite typical specimen, it is exsert. The anal area is covered by 
numerous small plates, among which the* central plate is hardly 
distinguishable; it is sometimes provided with a small tubercle. 
In one specimen the very curious anomaly, shown in fig. 11, is ob- 
served. In another, large specimen the madreporite occupies both 
Gen. 2 and 3. 
The spines round the peristome straight or only very slightly 
curved. The miliary spines somewhat thickened in the point, often 
Figs. 10—11. Apical system of Pseudechinus Huttoni. Pig. 11 shows the anomal} of 
Genitals 4 and 5 having coalesced so as to push Ocular Y entirely out of lts normal 
place. On the other hånd Genital I is divided into two parts. 
Fig. 10. 2,5/1. Fig. 11. 6/1. 
also slightly swollen below the point (PI. VII, Fig. 17). (In Ps. 
albocinctus they are hardly so much widened at the point.) 
The pedicellariæ (PI. VII, Figs. 12-16, 18) agree very closely 
with those of Ps. albocinctus ; it is however, to be emphasized that 
in the present species the globiferous pedicellariæ appear to have 
constantly the lateral tooth developed only on one side. As in albo- 
cinctus elongate ophicephalous pedicellariæ are found, which form 
a transition to the tridentate type. — Spicules are found only ex- 
ceptionally in the tubefeet. The giils contain numerous fine irre- 
gularly branched or fenestrated plates. 
Regarding the colour, Ben ham States that, though some spec- 
imens have white spines, all have the tubercles pinkish orange. I 
find, however, that in some specimens also the test and the tub¬ 
ercles are perfectly white — even so in a specimen which 1 
have received from Ben ham himself and which is otherwise 
