1014 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Localities: Type (no. 21146, U. S. National Museum) from station 4079, north coast of Maui, j 
143-178 fathoms, gray sand and foraminifera; bottom temperature 60.8°. Taken also at the following 
stations: 
Record of localities 
Station. 
Locality. 
Depth. 
Nature of bottom. 
3810 
South coast of Oahu Island 
Fathoms. 
211-53 
Fine coral sand. 
South coast of Molokai Island 
169-182 
Fine brown sand and mud. 
3957 
Vicinity of Laysan Island 
220-173 
Fine white sand. 
4044 
West coast of Hawaii Island 
233-198 
Fine gray sand. 
4045 
do 
198-147 
Coral sand, foraminifera. 
Gray sand, foraminifera. 
Do. 
4079 
North coast of Maui Island . 
143-178 
178-202 
154-195 
4080 
. . .do 
4114 
Northwest coast of Oahu Island 
Coral sand. 
This species is distributed, therefore, from Laysan to Hawaii, and its vertical range varies from 
169 to 233 fathoms. (31 specimens). 
Young ophiurans, and a young of the same species were found in the stomach of this starfish. 
This species is very abnormal Astropecten, if indeed it belongs in that genus at all. The actinal 
interradial areas are well developed and are paved with strongly imbricating plates, while the infero- 
marginals are relatively narrow fpr the genus. The general habit recalls Tethyaster subinermis of the 
Mediterranean region, although the disk is smaller. The superambulacral plates are less well 
developed than in typical Astropecten, and the plates forming the bases of the paxilke are lobed. 
An anal aperture is present. This, however, has been found in Astropecten americanus by Verrill. 
Astropecten mesactus Sladen has fairly large interradial areas, but differs considerably from this species 
in proportions and details of structure. 
Prof. Verrill has examined a specimen and believes it to be an Astropecten. 
Genus CTENOPHORASTER, new. 
Type Ctenophoraster hawaiiensis, new species. 
S'ze large. Disk relatively very small. Rays long, narrow at base, and tapering to a blunt 
extremity. General form depressed, flattened. 
Marginal plates of both series with well-developed ridges separated by deep, narrow, fasciolar 
channels. Superomarginal plates devoid of spines or any enlarged spinules or tubercles. They are 
much wider than high (except for a short distance in interradial arc) and are flattened, being confined 
almost entirely to the abactinal surface. Inferomarginals are very wide, extending laterally beyond 
superomarginals, armed with 3 oblique lateral series of numerous close-set, slender spines, which are 
continued toward the inner end of plate as a double series. 
Abactinal area with large paxillse, the pedicels of which are stout, cylindrical, and close-set, their 
bases flaring slightly to form roundish plates. Integument tough. 
Actinal interradial areas fairly large, considering the reduced size of the disk, paved with round 
plates, which extend as a single series between inferomarginals and adambulacrals nearly to tip of ray 
(fifteen-sixteenths of total length) . They are armed with a diverging group of numerous stout, blunt, 
tapering spinelets, and on disk each plate bears an enlarged, slender, central spinule surrounded by 
2 to 5 shorter ones, the periphery of the tumid plate being adorned with a single series of numerous 
papilliform spinelets. 
Armature of adambulacral plates consists of a furrow series of 4 or 5 spines, followed by 3 series of 
3 or 4 spines each, on actinal surface. All are stout but slender, the furrow series being slightly 
flattened. 
Well-developed and stout superambulacral plates are present. Ambulacral furrow narrow, deep, 
with almost perpendicular sides, the margin being slightly overhung by the adambulacrals. 
Madreporic body small, situated rather nearer margin than midway between it and center 
of disk. 
This genus is next to Astropecten, from which it differs in having a single series of small inter- 
mediate plates interposed between the adambulacrals and the inferomarginal plates. Its long rays, 
