STAKFISHES OF THE PHILIPPINE SEAS. 191 



b.^ Central spine of abactinal plates present on disk and rays, sometimes very 

 sparsely on the former, 

 c* Numerous abactinal spines on disk as well as on the rays ; pectinate 

 pedicellariae on actinal intermediate plates and usually fasciculate 



pedicellariae on the inferomarginals niasicus Ludwig, p. 192. 



c' Abactinal spines very few on disk; normally no pedicellariae present. 



inops Fisher, p. 191. 

 ft.* Central spine of abactinal plates present on ray only, frequently very 

 few and confined to the outer attenuate portion of the arm ; pedicel- 

 lariae on abactinal, inferomarginal, actinal intermediate plates, and 

 sometimes also on the superomarginals, and over the intermarginal 

 sutures. 

 c". Papularia small, with about 25 pores which do not extend farther than 

 the middle of the third superomarginal ; superomarginals narrow, 

 about twice as long as wide proximally; furrow spines 10-12; oral 

 spines 11-13; the innermost spine flattened, the tip of 1 of a pair 

 grooved or incipiently bifid; second not conspicuously widened; first 

 adambulacral plate with a single subambulacral spine. 



diomedeae Fisher, p. 200. 

 €." Papularia large, with 35 to 80 pores, which in full-grown specimens 

 extend to opposite the sixth or seventh superomarginals ; superomar- 

 ginals wider, distinctly less then twice as long as broad ; furrow spines 

 in largest specimen 9 or 10 ; in small and medium sized examples about 

 8; oral spines 8 to 10, the inner 2 broad, spatulate, with truncate often 

 crenulate tip; first adambulacral with 2 subambulacral spines. 



gasellae Studer, p. 196. 

 ■a*. No enlarged central spine on abactinal plates. 



l).^ Disk medium ; 1 superomarginal spine throughout series ; subambulacral 

 spine prominent. 

 c.^ Very large papularia with 35 to 80 pores ; inferomarginal spines long 

 and rather slender ; inferomarginal spinelets slender, papilliform ; 

 usually numerous inferomarginal fasciculate pedicellariae ; 15 to 15^ 

 adambulacral plates to first 10 inferomarginals; 1 suboral spine. 



gasellae Studer, p. 196. 

 c' Very small papularia with about 10 pores ; inferomarginal spines short 

 and thick; inferomarginal spinelets squamiform on center of plate; 

 normally no fasciculate pedicellariae on the actinal surface of infero- 

 marginals ; 17 adambulacral plates to first 10 inferomarginals; 2 sub- 

 oral spines ludwigi Fisher, p. 203. 



b.^ Disk large ; distal superomarginals with transverse series of 3 prominent 

 spines ; actinal interradial areas rather large ; pectinate pedicellariae on 

 proximal inferomarginals and on actinal intermediate plates ; subambu- 

 lacral spine rather small triplacantJnts Fisher, p. 205. 



CHEIRASTER INOPS Fisher. 



Chciraster inops Fisher, 1906, p. 1043, pi. 10, fig. 4; pi. 17, fig. 2. — Koehleb, 

 1909, p. 15.— Ludwig, 1910, pp. 445, 446. 



Notes on Philippine specimens. — The largest specimen exceeds the 

 type in size. R=118 mm., r=16.5 mm., R=7.1 r; breadth of ray at 

 base, 19 mm., at third inferomarginal, 15 or 16 mm. It is smaller 

 than Koehler's specimen, in which R=130 mm. 



These specimens differ slightly from the type, but the difference 

 in size must be taken into consideration. The central spine of the 



