590 THE VOYAGE OF H.M.S. CHALLENGER.’ 
Chorological Synopsis of the Species. 
Ocean. | Range in Fathoms. Nature of the Sea-bottom. 
Calvasterias antipodum . . q 
{ S. Atlantic and Eas- \ 
tern Archipelago. 
le Atlantic and 
Calvasterias asterinoides . 
Calvasterias stolidota 5 to 10 _ Sand, gravel. 
Pacific. 
1. Calvasterias stolidota, n. sp. (Pl. CI. figs. 3 and 4; Pl. CIII. figs. 11 and 12). 
Rays five. R=44mm.; r=1lmm. R=4~,7. Breadth of a ray at the base, 13°5 mm. 
Rays rather short, tapering slightly from the base to the extremity, which is obtusely 
pointed. Abactinal surface convex and arched, the lateral wall being nearly vertical. 
Actinal surface plane, forming an angular junction with the lateral wall. In the present 
condition of the specimen the rays are curved downward. Interbrachial arcs acute. A 
more or less clearly defined channel occurs upon the disk in the wrinkles of the membrane 
in the median interradial lines. 
The whole abactinal surface is covered with a somewhat puffy membrane, very clammy 
and unpleasant to the touch, marked with constrictions or wrinkles which pass between 
the papular areas. Midway on the ray in the median line the broad tips of a few obtuse 
but isolated spinelets may be seen protruding through the membrane, but they are 
scarcely noticeable. The papule are arranged in compact little groups of about five 
or six in each; the groups are well spaced and fall into six more or less regular longitudinal 
lines. A few small pedicellaria may be present in the neighbourhood of the papule of 
the outer two rows on each side. 
The armature of the adambulacral plates consists of a single robust, cylindrical, 
obtusely-tipped spinelet, the series of which forms a regular longitudinal line along the 
ray. At the base of these spines, on the margin of the ambulacral furrow, are a few 
short, robust, forficiform pedicellarie. The actinal plates, which form the margin of the 
tay, and are probably the representatives of infero-marginal plates, bear an oblique series 
of two or three equal, short, robust, obtuse spinelets. In the interspace between these 
plates and the adambulacral plates, which is narrow, are large isolated papule, and 
between these may be a spinelet intermediate in size between those on the adambulacral 
plates and the marginal plates, and these form an irregular series which, from their 
position, might at first sight be counted with either one series or the other; they are 
found, however, on examination to be not attached to the adambulacral plates. Above 
the infero-marginal plates just described, in the vertical wall of the ray, is a rather wide 
