436 THE VOYAGE OF H.M.S. CHALLENGER. . 
of two moderately elongate, robust, cylindrical, slightly tapering, obtusely tipped, equal 
spinelets, which stand close together one behind the other. At the base of the innermost 
spine, on the margin of the furrow, are occasional medium-sized forficiform pedicellariz, 
and near the mouth some of these are of the cat’s-paw form mentioned above. 
The madreporiform body, which is large and conspicuous, is situated near the margin ; 
its surface is slightly convex and marked with numerous fine, much convoluted striations, 
and its circumference is surrounded by a close circlet of about twenty-two short papilliform 
spinelets doubled in places. 
The ambulacral tube-feet, which are crowded, are disposed in a quadriserial arrange- 
ment, and have a small, fleshy, centrally invaginated terminal disk. 
Colour in alcohol, a bleached greyish white. 
Locality.—Station 311. Off the western coast of South America, near the entrance to 
the Strait of Magellan, opposite Port Churruca. January 11, 1876. Lat. 52° 45’ 30"S., 
long. 73° 46’ 0” W. Depth 245 fathoms. Blue mud. Bottom temperature 46°-0 Fahr. ; 
surface temperature 50°°0 Fahr. 
Remarks.—This remarkably handsome form is readily distinguished from all other 
species by the regular uniserial transverse lines of well-spaced, uniform, granule-like spinelets 
borne on the plates, by its general form and structure, and by the armature of the actinal 
or infero-marginal plates. Possibly the starfish described by Philippi’ under the name 
of Asteracanthion fulvwm may be allied to and congeneric with Stuchaster polygrammus, 
but it is clearly specifically distinct, as shown by the radial proportions, and by the state- 
ment that the series of plates most remote from the median radial series bear only two 
spines. In Stichaster polygrammus five or six are regularly present ; and the pedicellarie 
could scarcely be described as numerous or small, as is the case in Asteracanthion fulvwm. 
Unfortunately no types of the Chilian starfishes described by Philippi are available in any 
of the European collections, so far as I am aware, and no figures accompany the otherwise 
excellent descriptions. 
Genus Neomorphaster, n. gen. 
Glyptaster, Sladen in Narr. Chall. Exp., 1885, vol. i. p. 612 (non Glyptaster, Hall, 1852). 
Disk small. Rays broad at the base, comparatively long, subrigid and tapering. 
Interbrachial ares subacute. 
Abactinal area of the disk occupied by largely developed permanent primary apical 
plates, the dorso-central, basals, and radials being conspicuous; under-basals are also 
present. 
Rays covered with large, subhexagonal, slightly convex, imbricating plates, arranged 
in perfectly regular longitudinal lines; and bearing a few large, widely-spaced, semi- 
1 Archiv f. Naturgesch., 1870, Jahrg. xxxvi., Bd. i, p. 270. 
