STARFISHES OF THE PHILIPPINE SEAS. 501 



Remarks. — This species differs from all others of the genus in 

 having relatively enormous unguieulate adambulacral pedicellariae 

 in combination with proximally 3 adambulacral spines, Pedicellaster 

 atratus Alcock, from the Andaman Sea and Bay of Bengal, 220 to 290 

 fathoms, is of very large size for this genus, has 2 adambulacral 

 spines only, and lacks the large cat-claw pedicellariae. Its color is 

 described as uniform jet-black. 



PEDICELLASTER, species. 



There is a mutilated specimen of a Pedicellaster differing from the 

 preceding in having 2 adambulacral spines throughout the ray, in 

 lacking large forficiform cat-claw pedicellariae, in having rather 

 feAver minor pedicellariae (which, however, are closely similar to 

 those of chirophorus) . The spinelets are enveloped in a very evident 

 sacculus. 



Station 5630, south of Patiente Strait (lat. 0° 56' 30" S.; long. 128° 

 05' E,), 569 fathoms, coral sand, mud. 



Family BRISINGIDAE G. 0. Sars. 



SYNOPSIS OF THE KNOWN GENERA OF BRISINGIDAE.^ 



o\ Abactinal surface of disk and genital region of ray provided with numerous 

 conspicuous papulae ; 2 gonads to each ray ; mouth plates broad and fan- 

 shaped toward the actinostome, nearly closing the entrance to the ambu- 

 lacral furrow ; genital region of ray with transverse slieletal arches, be- 

 tween which the Integument is strengthened by immersed plates and 

 pierced by papular pores ; ray with regularly spaced, lateral, transverse 

 combs of upward of 7 conspicuous, slender spines ; adambulacral plates 

 higher than long, with a single, prominent subambulacral spine, frequently 

 truncate and more or less spatulate proximally ; first 3 to 5 pairs of 

 adambulacral plates united in each Interradius, and above them the 

 marginal plates are similarly united; a syzygy between first and second 

 adambulacral plates, and also sometimes a partial syzygy between the 

 second and third and between the third and fourth plates. Genotype, 

 Brisinya semicoronata Perrier Odinia Perrler. 



a'. A single circle of rather small papulae near margin of disk, 2 papulae cor- 

 responding to each ray ; rays, as in Brisinga, without papulae. First and 

 second adambulacral plates united by a syzygy (nonmuscular symphysis) 

 and upper part of second and third ambulacral plates united by syzygy ; 

 gonads numei'ous, in series ; first pair of adambulacral plates in each 

 interbrachium closely united (as in figs. 2 and 2a; pi. 156). Genotype, 

 Brisinga mimica Fisher Brisingenes Fisher. 



i'. No papulae present either on disk or on rays. 

 h^ No visible abactinal skeleton on rays but embryonic plates may be con- 

 cealed in the thin integument ; gonads unknown. 

 c\ Minute embryonic lattice-plates are present in abactinal integument of 

 rays ; functional skeleton of ray reduced to ambulacral and adam- 



^ For Lahidiaster, see under Pedicellasteridae. 

 13434— Bull. 100—19 33 



