STARFISHES OF THE PHILIPPINE SEAS. 213 



interradial pedicellariae, or even none in a specimen with R equal 

 to 35 mm. 



Type.— C'Ai. No. 32630, U.S.N.M. 



Type-locality. — Station 5654, Gulf of Boni, Celebes, 805 fathoms, 

 bottom not recorded, bottom temperature 38.3° F. ; 12 specimens. 



Distribution. — Known only from type-localit}'. 



Speoimens examined. — Twelve, from type-locality. 



Remarks. — The largest specimen differs very markedly from B. 

 Holaceus (Alcock) ; but the type of the latter has R about 100 mm., 

 and when comparison is made with an equal-sized example of tlie 

 present form, the differences are by no means so striking. The type 

 of B. violaceus is probably but half grown. A large specimen would 

 very likely have more numerous pedicellariae, more numerous ab- 

 actinal spinelets, and more numerous furrow spines. 



The following are the differences between B. violaceus and B. 

 polyctenius of equal size : 



B. violaceus. B. polyctenius. 



24 adambulacral plates correspond 20 adambulacrals correspond to first 

 to first 10 inferomarginals. 10 infei'omarginals. 



No abactinal pedicellariae. Abactinal pedicellariae few, on disk 



only. (In the type, numerous on disk 



and rays). 



Inferomarginal pedicellariae in in- Inferomarginal pedicellariae in in- 



terbrachial arcs only. terbrachial arcs and far along ray also. 



Furrow spines, 7 or 8. Furrow spines, 9 to 11 (as high as 



13 or 14 in type). 



B. polyctenius belongs to the genus Pararchaster, as defined by 

 Ludwig (1910, p. 462). In his key the species would follow directly 

 after violaceus, with the differential characters just cited. 



BENTHOPECTEN STYRACIUS Fisher. 



Plate 53, fig. 2; plate 55, figs. 3, Sa. 



Benthopccten styracius Fisher, 1913c, p. 208. 



Diagnosis. — Similar in general appearance to B. violaceus, but 

 with numerous abactinal pedicellariae, and ver}^ large odd inter- 

 radial superomarginal spines; differing from B. polyctenius in hav- 

 ing only 1 or 2 spinelets to each abactinal plate of the ray, much 

 larger interradial superomarginal spines, no accessory superomar- 

 ginal spines, fewer inferomarginal pedicellariae (none on outer part 

 of ray), fewer furrow spines. R=105 mm., r=:10.5 mm., R=10 r; 

 breadth of ray at base, about 10 mm.; odd interradial superomarginal 

 fcpine, 17 mm. long. 



Description. — Abactinal surface in general resembling that of 

 equal-sized specimens of B. polyctenius, but the prominent spines 

 of disk and basal portion of ray (papular area) fewer and smaller. 

 13434— I Ui 11. 100—19 15 



