STARFISHES OF THE PHILIPPINE SEAS. 205 



Then the spines increase slightl3% to decrease again, the outer 4 being 

 independently graduated in length toward the 2 mesial (fifth and 

 sixth from inner end of series). Snboral spines 2, in a series parallel 

 to median suture, along which are about 6 spinelets on each plate, in 

 addition to 1 or 2 in line with the suborals. 



Pedicellariae, as detailed above occur: (1) Abactinally; (2) be- 

 tween the superomarginals interbrachially ; (3) between supero- and 

 inferomarginals on outer part of the ray; (4) on the actinal inter- 

 mediate plates. One inferomarginal plate of the type has a small 

 fasciculate pedicellaria and one-half of a pectinate pedicellaria on 

 the transverse suture. 



Madreporic body situated its own diameter distant from margin, 

 and with a large plate on the adcentral side ; striae numerous, fairly 

 coarse. 



Type.—Q^i. No. 32627, U.S.N.M. 



Type-locality.— Station 5660, Flores Sea (lat. 5° 36' 30'' S. ; long. 

 120° 49' E.), 692 fathoms, gray mud, sand, bottom temperature 

 39.2° F. ; 1 specimen. 



Dlstrihutlon. — Known only from the type-locality. 



Remarhs. — This deep-water form differs from Ch. trullipes 

 (Slaclen) in having a well-developed actinal intermediate area, 

 actinal and intermarginal pedicellariae, larger abactinal paxillae, 

 longer furrow spines, 7 oral spines, and 17 (instead of 15) adambu- 

 lacrals to the first 10 inferomarginals. Ch. trullipes was taken by 

 the Challenger west of Luzon, in 1,050 fathoms, blue mud, bottom 

 temperature 37° F. It thus belongs to greater depths and to a lower 

 temperature belt than the Flores Sea species. 



This species is named in honor of the late Dr. Hubert Ludwig, 

 whose paper on the Notomyota includes a most useful revision of 

 Cheiraster. 



CHEIRASTER TRIPLACANTHUS Fisher. 



Plate 48, figs. 3, 4 ; plate 55, figs. 1, la. 



Cheiraster triplacanthus Fisher, 1913c, p. 206. 

 Diagnosis. — Belonging to the subtubeTCulatus group; differing 

 from subtuherculatus in having actinal pedicellariae, 7 or 8 furrow 

 spines, longer inferomarginal spines, and especially in having a trans- 

 verse series of 3 prominent superomarginal spines on the distal half 

 of ray and 1 spine only on the proximal half. Disk large, rays slen- 

 derer than in subtuherculatus, tapering very gradually from wide 

 interbrachial arcs to a bluntly pointed tip. R=49 mm., r=12 mm., 

 R=4 r; breadth of ray at first superomarginal 14 mm., at third, 

 8.5 mm. No abactinal spines; papularia large, flat, two-lobed; 1 in- 

 feromarginal spine, and proximally 1 or 2 small accessories; 8 or 9 

 oral, and 1 suboral spine. 



