STARFISHES OF THE PHILIPPINE SEAS. 87 



tenellus^ which it resembles in having the superomarginal spines 

 extending as far as the middle of ray. This would cut out eremicics, 

 which entirely lacks superomarginal spines, and luzonicus, in which 

 the spines occur only at the base of ray. If, however, a small speci- 

 men of luzonicus (R.=30 mm., r=6 mm., R=5 r) only slightly 

 larger than Sladen's type is compared with his figures and descrip- 

 tion the following additional differences are evident. In luzonicus 

 the rays are much slenderer, the paxillar area narrower, and such 

 superomarginal spines as are present, shorter. There are 2, not 3 or 4, 

 lateral spines, the superficial mouth spines are conspicuously stouter 

 than the lateral marginals and in a single series. The median furrow 

 spine is strongly compressed and longer than the laterals. 



There is a specimen of tenellus with E = 22 mm., r=^4.5 mm., 

 R=slightly less than 5 r. (In imhellis R:=:24 mm., r=7 mm., 

 E = 3.43 r.) The rays of tenellus are longer and slenderer than 

 those, of imhellis. even though the specimen is smaller, the paxillar 

 area is relatively narrower, one of the subambulacral spines is con- 

 spicuously enlarged and all are longer than in imhellis, interradial 

 pedieellariae are present, and the inferomarginal spinelets are spaced, 

 sparser, sharp, and closely appressed. The aboral line of accessory 

 spinules characteristic of the adult has begun to develop. 



The numerous pedieellariae of pedicellaris, as well as its propor- 

 tions and adambulacral armature will serve to distinguish it from 

 imbellis. 



ASTROPECTEN PEDICELLARIS Fisher. 



Plate 12, fig. 1; plate ]3, fig. 4; plate 15, figs. 2, 2a-e. 

 Astropecten pedicellaris Fishek, 1913a, p. 607. — Dodeklein, 1917, pp. 50, 176. 



Diagnosis. — Similar in general appearance to A. tenellus, but dif- 

 fering in having abundant abactinal and adambulacral pedieellariae 

 as well as pedieellariae on superomarginal and inferomarginal plates, 

 smaller paxillae, narrower superomarginal plates, and more promi- 

 nent lateral spines, which are 4 in number, except on outer third 

 of ray, where 3 are present. Eays long and slender; paxillar 

 area narrow. E=:T4 mm., r=9 mm., E=8.2 r; breadth of ray at 

 base, 9 to 10 mm. 



Description. — Paxillae similar to those of A. ej^emicus. Spinelets 

 terete, blunt, usually as long as or a trifle longer than pedicel; and 

 on the largest paxillae of interradial areas there is 1 central 

 spinelet and 9 or 10 in a peripheral series; halfway along ray there 

 are 6 or 7 in a peripheral series and no central spinelet. Scattered 

 over the paxillar area are numerous conical pedieellariae with 3 to 6 

 blunt, tapering, spiniform jaws which are slightly longer than the 

 pedicels of paxillae. 



