178 
distinctly and regularly concave, the mouth somewhat sunken. The 
anal area is situated in the middle between the mouth and the 
edge of the test. The periproctal plates naked. The petaloid area 
occupies somewhat less than half the length of the test. The petals 
are the widest about in the middle. The genital pores are fairly close 
together, at some distance from the interradial corners of the apical 
system. They are rather late in appearing, having not yet been 
found in specimens of 19 mm length. Even 
in a specimen of 22,5 mm length (in the Brit- 
ish Museum, cf. below) the genital pores have 
not yet appeared. 
The pedicellariæ (PI. VII, Figs. 31, 33—34) 
are of the three usual types and of the struct- 
ure characteristic of the Laganids, as seen in 
the figures. Only a small form of tridentate 
pedicellariæ has been observed; it is some- 
times bi-valved. The spines of the usual type. 
The primary spines are very smooth, those of 
the aboral side somewhat fusiform (Fig. 18). 
It is a noteworthy faet that the miliary spines 
are different on the two sides of the test, the 
widened ends of the component rods being 
Fig. is. Primary spines smooth on those of the aboral side, more or less 
tTZToiZ7Z a m coarsely serrate on those of the orai side (PI. 
the oral side. 12 %. VII, Figs. 32, 35). (This holds good also for 
P. pellucida). The colour is slightly reddish; the test not pellucid. 
Hauraki Guff, off Hen and Chicken Isl., 100 m, 31 /xn 1914. 
One large specimen (31 mm) and three small ones. 
Colville Channel, 70 m, 2l /xn 14. One large specimen (41 mm) 
and one small, both naked tests. 
Two miles E. of North Cape, 110 m, 2 /i Ib. One specimen 
(37 mm). 
The specimens from off North Cape, 70 fathoms, mentioned by 
Bell (Op. cit.) as Laganum sp. („two young specimens, which it 
is impossible to determine with accuracy“) evidently also belong 
to this species. I have examined the specimens in the British 
Museum; there are four of them, not two as Bell States, and one 
of them is fullgrown, 29 mm long, another 22,5 mm long, so that 
