345 
Mr. Farquhar, to whom science is indebted forso many valuable 
contributions to the knowledge of the New Zealand Echinoderm 
fauna. 
9. Cucumaria Bollonsi n. sp. 
Cape Maria van Diemen; among algæ on the rocky shore 4/1. 1915. 
6 specimens (together with C. brevidentis). 
The largest specimen, which is strongly contracted, measures 
only 5 mm in length, by 3 mm in thickness. The rest of the 
specimens are quite young, only 3—4 mm long, fully extended. 
The body simply sausage-shaped, anterior or posterior end not 
upwards turned. The ventral pair of tentacles much smaller than 
the rest of them. Tubefeet of the trivium in close, double series, 
in the largest specimen even with an indication of a pluriseriate 
condition in the lateral radii; this, however, is probably due only 
to the strong contraction of the body. In the bivium the tubefeet 
are arranged in a rather distant double series along each radius, 
and some smaller scattered ones are found also in the middorsal 
interradius. 
The skin is very delicate and thin, and contains three sorts of 
calcareous deposits: plates, buttons and cups. The plates (Fig. 32.a) 
are small and perfectly smooth; they are found only very sparingly 
so as not at all to lend any strength to the skin. Somewhat more 
numerous are the buttons (Fig. 32.b), which are small, ovoid, typically 
with four holes and now and then a few smooth knobs; they may 
occur also in the walls of the tubefeet and generally lie like a 
wreath round the retracted dorsal feet. In young specimens the 
buttons are very scarce, while the plates are a little more numerous. 
In the larger specimen it is just the inverse, evidently because no 
new plates are formed, while new buttons are developing later on, 
during growth. By far the most numerous sort of calcareous bodies 
are the cups, which are very characteristic. In the main they are 
x-shaped bodies, more or less irregular (Figs. 32.c), in a few of 
them the branches coalesce so as to show them to be rudimentary 
cups. Around the anal opening are larger plates, forming rather 
distinet anal teeth. The spicules of tubefeet and tentacles of the 
ordinary type (fig. 32.d); the sucking disk is provided with a large 
round end-plate. 
