343 
The calcareous ring well developed, both radial and interradial 
pieces with an anterior prolongation (Fig. 30.a). There is one Polian 
vesicle and one stone canal. Genital tubes short, unbranched. Oeso- 
phagus without muscular thickening. The retractors are attached 
about in the middle of the body. 
Colour of the living specimens yellowish, in alcohol white. The 
larger specimen from Stewart Island is reddish. 
This species does not appear to be more nearly related to any 
species hitherto known. 
8 . Cucumaria Favquhavi n. sp. 
2 Miles E. of North Cape, N. Z. 55 fms. Hard bottom. 2/1. 1915. 2 
specimens. 
The larger specimen, which is well extended, measures 13 mm 
in length, by about 4 mm in thickness. The shape of the body is 
about cylindrical, the ventral side, however, more or less flattened; a 
short, upwards turned tail end. The anterior end not upwards turned. 
The ventral pair of tentacles distinctly smaller than the rest of 
them. The tubefeet of the trivium arranged in fairly regular double 
series along each radius; they are, however, developed only in the 
main part of the body, lacking entirely in the anterior and posterior 
end. The part carrying the tube feet thus forms a more or less 
pronounced sole. Tubefeet entirely lacking on the dorsal side. 
The calcareous deposits are of three kinds: large, coarse, over¬ 
lapping scales, buttons and small cups. The large scales, which 
make the thick skin hard and rough, show a peculiar structure: 
smooth, rounded, somewhat elevated knobs, surrounded by smaller 
holes, connected by narrow tubes or canals (Fig. 31.a); in the an¬ 
terior and posterior part of the body and on the dorsal side they 
are prolonged into a short, prominent thorn, which gives rather the 
impression of a grain; in faet, the body covering recalls the grainy 
scaling of a Psolus. Towards the anal opening the thorn of the 
scales becomes somewhat more elongated; the anal teeth rather 
indistinet on account of these thorns. On the ventral side the plates 
are not thus prolonged into a thorn. The buttons (Fig. 31.b), which 
have a few round knobs, are found mainly along the edges of the 
larger plates. The cups (Fig. 31.d—e), which lie in great numbers 
in the epidermis, are somewhat spinous, with rounded thorns. The 
