350 
notice, in view of the faet that both Dendy and Ludwig failed 
to discover them. Probably Perri er has seen them, as he States 
to have found tubefeet in the lateral regions of the dorsal side; 
in faet, the dorsal ambulacra are nearer the ventro-lateral ambulacra 
than to the dorsal midline in the swollen middle part of the body, 
while in the anterior and posterior body parts all the ambulacra 
are equidistant. Thus, in the middle part of the body the middorsal 
interradius is unusually broad. In the anterior and posterior body 
parts the ambulacra form very conspieuous furrows, apparently 
wholly devoid of tubefeet, excepting the base of the posterior part, 
where a few tubefeet are distinetly seen. The introvert is wholly 
without tubefeet. The tentacles of equal size. No anal papillæ.^) 
The calcareous deposits, according to Dendy, would appear to 
be only of one kind, but of various size. Ludwig States that 
there are larger scales of an elongate-oval shape, upto 1 mm long, 
between and below which are lying very numerous, smaller, rounded 
plates of various sizes, conform to the figure given by Dendy. 
Perri er appears to have observed only the one form figured by 
Dendy. In the specimen examined by me the calcareous deposits 
are of two distinet kinds. The larger form (Fig. 34) is elongate- 
% 
oval, or even rectangular in shape, formed by a very close mesh- 
work of the sort usual in the thicker plates of Echinoderms. But 
these plates are bent, saddleshaped, one end implanted deep in the 
1) Ludwig has found a circle of cylindrical anal papillæ in two broken 
off caudal portions, which he refers to this species, while he did not 
observe any anal papillæ in his two complete specimens; he therefore 
suggests that in these apparently complete specimens the point of the 
tail end had really been lost. The explanation of.this discrepancy (— also 
Dendy, who has studied a fresh specimen, States that there are no anal 
papillæ —) is this that the two tail ends examined by Ludwig were 
not of C. Huttoni, but of C. oenoides, in which latter there is a circle 
of cylindrical papillæ around the anal opening. I am in a position to offer 
this explanation not as a suggestion, but as a faet, having had, through 
the kindness of Professor R. Hesse, Bonn, the said objects for direct 
comparison with my specimens. 
The tail end of C. oenoides appears to be liable to break off, when 
the animal which, evidently, lies buried deep in the ground, with the 
ends just protruding above the bottom surface, is hit by the dredge. Also 
the present author has obtained such a broken off tail end of this species 
in the dredge. 
