SEA LILIES, STARFISHES, ETC. — CLARK. 69 



medioradial plate, but distally only on every other plate ; there 

 is never more than one to a plate ; nearly all these spines are 

 missing in the specimens at hand, but the tubercles are con- 

 spicuous and enough spines are left to show their size. The 

 superomarginals bear similar but smaller and more slender 

 spines. Pedicellarise both large and small are present every- 

 where, very large ones, 1.5-2 mm. long, occurring on the 

 medioradial plates. Adambulacral armature essentially as 

 in Z. spinulosus but pedicellarise appear to be much more 

 abundant. Colour (in alcohol), yellowish-brown. Three 

 specimens. 



It is not without some hesitation that I separate this 

 Zoroaster from the Hawaiian species, but until something is 

 known of the fauna of the vast area between southern Aus- 

 traHa and the Hawaiian Islands, it seems best not to assume 

 the identity of species in the two regions. Apparently the 

 AustraHan Zoroaster is conspicuously more spiny than its 

 Hawaiian congener, and since the medioradial plates and 

 spines seem to furnish a tangible character, I have determined 

 to give it a different name. The largest specimen has R = 

 160 mm. ; r=14 mm. ; R = 11.5 r. The primary disk-plates 

 have prominent bosses like those on the medioradial plates 

 and apparently, in life, bore similar conspicuous spines. 



Zoc— Great Australian Bight, 129° 28' E., 250-450 fathoms. 



Family PEDICELLASTERID^. 

 Genus Pedicellaster, Sars. 

 Pedicellaster reticulatus,! sf. nov. 



(Plate xxvii., fig. 3-4.) 



Rays 6, unequal, three larger and three smaller ; the middle 

 one of the smaller trio much smaller than the others, being 

 about 22 mm. long, while they are over 30 mm. R=37 mm. ; 

 r=5 or 6 mm. ; R = 6 or 7 r. Br=5 mm. ; R = 7 br. Br at 

 middle of ray, 3.5 mm. ; at tip, 1.5 mm. Disk small ; arms 

 relatively broad for a Pedicellaster. Abactinal skeleton made 

 up of slender rods and plates forming a large-meshed net- 

 work ; on each arm there are about 4 longitudinal series of 

 these meshes, with 20-25 meshes in each series ; at many 



1. Beticulatus=-with meshes like a net; in reference to the wide- 

 spaced skeleton. 



