The Echinode>rmata of Jhew (Brunswick. 49 
17. Ctenodiscus crispatiis, (Eetzius), Duben and Korek. 
Ctendiscus corniculatus, (Linck), Perrier, (U). [See 
Plate, Fig. 11.] 
Description. (K) p. 113, (U) p. 49. 
Figure. (K) p. 114, (U) pi. III. 
Distribution, {a) General; — Twenty-five to three hundred 
and twenty-one fathoms. South of Cape Cod, Bay of Fundy, 
Newfoundland, West coast of Greenland, Melville Island and 
Assistance Bay, Arctic Ocean, Spitzbergen, Barents Sea, Fin- 
miark, Scandinavian coast. 
(b) In N. B. waters ; — Grand Manan, fifty and sixty fath- 
oms, muddy bottoms, not rare, Stimpson. (Dk Beaver and 
Bliss harbors, mud bottoms, Ganong (X). Gulf of St. Law- 
rence, one of the most characteristic asterids of the greatest 
depths, Whiteaves, (P). 
This is the most common of our three penta£?onal Starfishes, and 
though (lull in color is made attractive by its shape, curiously arranged 
marginal plates and unusual spinulation. In all of the pentagonal, as 
distinguished from the rayed Starfishes, the rays are much shorter than 
the diameter of the disk, and merge so gradually into it and into one 
another that the whole animal reminds one of a disk with five rounded 
lobes cut from its edge, rather than of a disk with five rays springing 
from it. 
It sometimes attains to a size of over two and one-half inches across, 
but few specimens will exceed two inches. The rays are always five in 
number, about three-fourths of the diameter of the disk in length, and 
have the ancles between them so well rounded that a very regular curve 
runs from the tip of each ray to the tip of its neighbor. The ambulacral 
furrows are rather broad, and each contain two rows of stout tube-feet, 
which, instead of being provided at their extremities with sucking 
disks, as in most of our Starfishes, are simply pointed. The upper sur- 
face of the disk, which in living specimens is usually swollen out, but 
in those which have been dried, very flat and somewhat depressed, is 
bounded all around by the upper ends of the marginal plates. It is 
almost completely covered by club-shaped processes or tubercles, each 
of which bears on its summit five to ten upright, rounded spines, so small 
as to be just visible to the naked eye. So uniform in size are these pro- 
cesses, with their flat tops and spine clusters, and so evenly and closely 
together are they placed, that their upper ends seem at first sight to 
form the upper surface itself of the animal. Near one angle is the 
madreporic body, and in the very centre of the disk is a conical pro- 
