363 
The ventral sole with a close layer of fairly regular plates, in 
which, as a rule, four primary holes are recognizable, surrounded 
by an outer, more or less regular circle of smaller holes; rounded 
projections along the edge, and 
mostly a few knobs in the 
middle of the plate. (Fig. 45). 
Tentacles 10, finely bran- 
ched; the ventral pair conspi- 
cuosly smaller than the others, 
not branched, only bifid at the 
point. Tubefeet of the ventral 
sole arranged in a double series 
around the whole edge of the 
Fig. 45. Calcareous deposits of Psolus neo- 
zelanicus. The upper series plates from the 
ventral sole; lower figine rod from tentacle. 
166 /, 
sole, those of ihe outer series being as large as those of the inner 
series. No tubefeet in the median radius. Spicules of tubefeet like 
the plates of the ventral sole, only bent so as to fit the wall of 
the feet; those of the tentacles irregular, more or less branched 
rods (Fig. 45, the lower figure). 
Calcareous ring well developed, of the form usual in this genus. 
1 stone canal and 1 Polian vesicle. 5 pairs of shcrt, thick genital 
coeca, containing a fairly large number of rather small eggs, ca. 
0.2 mm in diameter (which have the appearance of being, at least, 
very nearly ripe). This small size of the eggs, rather unusual for 
a Dendrochirote, would seem to indicate that this species may 
perhaps have true pelagic larvæ, though such are otherwise unknown 
among the Dendrochirotes. At least, we may feel sure that it does 
not protect its brood. 
It appears that this species is not very close’y related to any 
other species hitherto described; but it is evident that it belongs 
to the squamatus-gro\xp. 
19. Caudina coviacea (Hutton). 
Molpadia coriacea. Hutton. 1872. Catalogue Echinod. New Zealand, 
p. 17. 
— — Hutton. 1878. Notes on New Zealand Echinod. 
Trans. N. Z. Inst. XI. p. 307. 
Caudina meridionalis. F. Jeffr. Bell. 1883. Studies in Holoth II. P. Z. 
S. p. 58. PI. XV.i. 
