STAKFISHES OF THE PHILIPPINE SEAS. 197 



terizes Gh. snyderi)^ for the reason that the ray is recurved and the 

 terminal third is hidden, and the figure is not large enough to show 

 such spines. Studer does not mention them. It must be remembered 

 tliat Studer's type was small, E measuring only 61 mm. 



In all the large specimens listed below these spinules are present. 

 In 3 large examples from station 5538 the maximum of variation is 

 present. In one the inconspicuous central spinules are found only 

 on the terminal attenuate sixth of the ray and are few in number. 

 In the other 2 specimens they extend unevenly to the papularia. In 

 a large specimen from station 5122 the spinules are present only 

 near the tip and are few in number. Numerous small examples 

 (R 45-60 mm.) from station 5388 either lack the spinules or have a 

 few on the terminal third or fourth of the ray. At best they are in- 

 conspicuous. There are a few other differences which will be 

 pointed out the course of the description. 



Diagnosis. — Closely related to Ch. snyderi Fisher, but differing 

 in having in the adult longer marginal, subambulacral, and furrow 

 spines, larger papularia with more numerous pores, ahnost obsolete 

 abactinal central spinules, slightly more numerous furrow spines; 

 pedicellariae numerous on actinal intermediate plates, on inferomar- 

 ginals, abactinally (very variable), and intermarginally ; in large 

 specimen 15 or 15^ and in small specimen 14, adambulacral plates 

 corresponding to first 10 inferomarginals. Large example from sta- 

 tion 5122 measures: R=120 mm., r=15 mm., R=8 r; breadth of ray 

 at base, 19 mm. 



Description. — As compared with Ch. snyderi., the spinelets of the 

 paxillae are a little longer. A large paxilla has about 20 and a 

 medium-sized one about 10 papilliform, pointed spinelets in a flori- 

 form group. Sometimes the central spinelet is a trifle longer than 

 the others. The enlarged central spinule, as stated above, varies in 

 occurrence, being usually confined to the outer third to sixth of ray. 

 but occasionally straggling as far as the papularium, and sometimes, 

 especially in small specimens, being entirely absent. The papularia 

 are large, bifid distally, the total length being about two-thirds the 

 diameter of disk. In a large specimen (station 5122) there are 

 about 85 pores to an area, and in a small example (station 5388), 

 about 42; in Ch. snyderi there are about 30, and the papularium is 

 about r in length. The outer end of the papularium is opposite the 

 sixth or seventh superomarginal in gazellae; opposite the end of the 

 third in snyderi. 



Abactinal pectinate pedicelhiriae usually rare. In some speci- 

 mens from station 5388 they are very abundant. The larger consist 

 of 7 to 9 sharp spinelets in 2 curved combs (each on a separate plate). 

 These spinelets are conspicuously larger than the other spinelets and 



13434— Bull. 100—19 14 



