STARFISHES OF THE PHILIPPINE SEAS. 201 



lariiim alone will readily separate this species from gazellae^ in which 

 the pores of even small specimens are over 35 in number. 



The siiperomarginals, 40 in number, are narrow abactinally, the 

 extreme length being about twice the abactinal breadth (2.5 mm. : 

 1.25 mm.), and the long single spine is lateral in position. This 

 spine is quite short on the fii-st plate, but increases in length up to 

 the fifth, where it is exactly 2 plates in length ; this length is main- 

 tained for a few plates, then the spine decreases gradually and a 

 little more rapidly than the decrease in the length of the plates, for 

 on the outer half of ray it is 1.5 plates in length. The first 3 or 4 

 transverse superomarginal sutures have a small pectinate pedicellaria. 

 The general surface of the plate is covered with very short, slender^ 

 delicate spaced spinelets, a little longer near the base of spine. No 

 accessory spinules. 



Inferomarginals rather narrow actinally but very tumid laterally, 

 with one slender, tapering, sharp, lateral spine, ordinarily a little 

 slenderer and shorter than the corresponding superomarginal spine 

 on the proximal third of ray; but beyond that point the spine de- 

 creases very slowly in size, while the superomarginal decreases much 

 more rapidly. The inferomarginal spine is 1.5 to 2 times the 

 length of the superomarginal on the outer third of the ray and about 

 2 to 2.25 plates in length. Just below the principal spine is a sec- 

 ond one, half to two-thirds its length, while on the proximal fourth 

 of ray is a third (and sometimes beside it a fourth) about one-half 

 or two-thirds as long as the inner border of the plate. The general 

 surface of the plate is covered with well-spaced spinelets similar to 

 those of the superomarginals. With the exception of the first or 

 first 2 inferomarginals and those of the terminal third of ray (about 

 the last 20) , the actinal surface of each plate bears 1 or 2 conspicuous, 

 circular, fascicular pedicellariae with 5 to 8 sharp, tapering teeth. 

 In addition, on the longitudinal intermarginal suture, to nearly 

 every pair of supero-inferomarginals beyond about the tenth, is a 

 small pectinate pedicellaria with 3 to 5 slightly modified spinelets 

 to each comb. The 2 combs meet over the intermarginal suture and 

 may occur up to the last marginals. 



Corresponding to first 10 inferomarginals, 16 adambulacral plates. 

 The latter are distinctly spaced and have a semicircular, prominent 

 furrow margin bearing at the base of ray 10, increasing on outer 

 part of ray to 12 slender, round-tipped, slightly curved spines, of 

 which the median 6 or 7 are the longest. On the actinal surface of 

 plate is a single slender, tapering, sharp, slightly curved spine about 

 as long as the inner border of the adjacent inferomarginal; on the 

 outer two-fifths of ray a second shorter one is added between the 

 first and the furrow series. There is no second subambulacral spine 

 on the first ambulacral, as in Ch. gazellae^ Ch. snyderi^ Ch. inopSy 



