NO. 1944. NEW GENERA AND SPECIES OF STARFISHES— FISHER. 615 



inferomarginal plates, and a shorter series of actinal intermediate 

 plates. E, = 78 mm., r = 18 mm., R = 4.3 r; breadth of ray at inter- 

 brachium, about 20 mm. 



Ttjpe.— Cat. No. 30522, U.S.N.M. 



Tyj)e-locality. — Station 5326, off northern Luzon (lat. 18°32'35''N.; 

 long. 122° 01' E.), 230 fathoms, mud; bottom temperature, 55.4° F. 



The most striking difference between this species and a less spinous 

 variety than the typical P. euryadis is in the narrower rays, which 

 instead of being rather broad near the tip and then quickly narrowing 

 to an attenuate extremity, taper graduall}^ from a narrower base. 

 The superomarginals are of the same width in the two species and as a 

 consequence the paxillar area is much narrower in luzonicus, its width 

 at one-third R from center being one and two-thirds to slightly less 

 than twice the extreme width ot a neighboring superomarginal, and 

 at two-thirds R, about as wide as the superomarginals. In euryadis 

 these proportions are' respectively 2^ to 2f, and If. Adambulacral 

 armature similar to that of P. euryadis, but furrow spines 7 or 8, the 

 eighth being usually a shorter spine at the adoral end of the series. 

 Proximally, 8 or 9 subambulacral spines, slender, terete, blunt, much 

 shorter than the furrow spines, and in 2 longitudinal series; distally, 



10 or 12 spinules similar but relatively a little shorter in 2 series, with 

 often the beginning of a third, on the outer part of the plate. The 

 actinal intermediate plates, owing to the narrowness of the ray, are 

 very small beyond the proximal third or fourth of the ray. 



PERSEPHONASTER TENUIS, new species. 



A slender-rayed species with block-like conspicuous marginals, 

 which are not markedly tumid as in the "cingulate" species such as 

 multicindus , cingulatus, and roulei; superomarginals with slightly 

 wider dorsal than lateral face; lateral face of ray perpendicular, the 

 upper and lower margm evenly and abruptly rounded; superomarginal 

 plates without conspicuous spines; inferomarginals narrow, with 

 lateral comb of, proximally, 5 rather short slender appressed spines, 

 and 1 actinal spmule on the proximal plates only; furrow spines 7 

 or 8; subambulacrals 4 to 7 proximally, distally 8 to 10; a few fasci- 

 culate adambulacral pedicellarise. R = 81 mm., r=18 mm., R=4.5 

 r; breadth of ray at base, 20 mm.; at tenth superomarginal, about 



11 mm. 



Type.— Cat. No. 30523, U.S.N.M. 



Type-locality. — Station 5301, China Sea, vicinity of Hongkong 

 (lat. 20° 37' N.; long. 115° 43' E.), 208 fathoms, gray mud, sand. 



This species differs from luzonicus in having still narrower rays; 

 superomarginals which encroach less upon the paxillar area, and have 

 proportionately higher lateral faces; more delicate superomarginal 

 spinelets; practically no specialized spines, except a very small one 



