30 Proceedings of the Biological Society of Washington. 



of pedicellariae characteristic of alfredi. R=282mm., r= 15.5 mm., R 

 =18 r; breadth of ray at base, 17 mm. Disk very small, fairly level on 

 top in large specimens, tumid in small ; rays slender and strongly cari- 

 nate, the carinal plates forming a definite spiniferous ridge. Between 

 adradial plates (which have no central spine) and adambulacrals, 7 

 longitudinal series of plates at base of ray, each plate with a central con- 

 spicuous, slender, tapering, sharp spine, which on the 3 lowermost rows 

 becomes flattened and appressed. x\dambulacral armature: 1 spine deep 

 in furrow with a terminal three-cornered sacculus with upward of 10 

 unequal, medium sized and small pedicellarise, and above this a row of 3 

 or 4 spines bent outward, the third usually the longest; that above furrow 

 spine with a large pedicellaria. 



Type— Cat. No. 37,008 U. S. N. M. 



Type-locality. — Station 5606, Gulf of Tomini, Celebes, 834 fathoms, 

 green mud, 1 specimen. 



Zoroaster microporus new species. 



Diagnosis. — Related to Zoroaster barathri Alcock, from which it differs 

 in having squarish, instead of hexagonal carinal plates, smaller miliary 

 spinelets, longer central spines on 5 lateral rows of plates (instead of on 

 the 2 or 3 lowermost series only), more numerous pedicellarise, in having 

 2 inner spines of the prominent adambulacrals with pedicillariae (3 in 

 barathrif), and in having 2 transverse series of spines on the actinal face 

 of both sorts of adambulacrals. R=205 mm., r=12 mm., R=17 r; 

 breadth of ray at base, 13 mm. Disk small, scarcely more than the 

 united bases of the rays ; rays long, slender, with a conspicuous, rounded 

 unarmed carinal ridge, and a well-defined sulcus along either side; 5 

 series of lateral plates with a central spine ; tube-feet biserial. 



Type.— Cat. No. 37,009 U. S. N. M. 



Type-locality. — Station 5637, 21 miles southwest Amblan Island (off" 

 Bouro Island), Moluccas (3° 53^ 20'^ S., 126° 48' E), 700 fathoms, gray 

 mud. 



Zoroaster carinatus philippinensis new subspecies. 



Diagnosis. — Differing from Zoroaster carinatus in having more numerous 

 adambulacral spines, with many more pedicellariae ; less tumid apical 

 plates, less prominent central spinelets to carinal plates ; more numerous 

 pedicellarise generally. Disk small, rays long, slender, pointed, with a 

 midradial ridge or carina; central spinelets of carinal plates slightly en- 

 larged; 4 rows of slender appressed spinelets along side of ray (3 in small 

 specimens); superomarginal and proximal inferomarginal plates without 

 central spine (the latter sporadically with spine in carinatus); prominent 

 adambulacral plates with transverse series of 6 or 7 spines (5 in small 

 specimens), the inner 2 with several large and small pedicellarise. 

 R=194 mm., r=13.5 mm., R=14 r; breadth of ray at base, 14 or 15 mm. 



Type.— C&t. No. 37,010 U. S. N. M. 



Type-locality. — Station 5587, Sibuko Bay, Borneo, 415 fathoms, green 

 mud, sand, coral; bottom temperature 42.3° Fahr. 



