104 Mr. A. Alcock on 



abactinal to the actinal surface ; the phites of the lowest (most 

 actinad) two or three vows bear each one or two centrally- 

 phiceJ spines whicli are of slightly superior size. The small 

 intervals between the angles of the closely apposed phxtes give 

 exit, excei)t between the two lowermost (most actinad) rows, 

 each to a papula, and (on the jdates) between every two 

 papulaj is a |)edicellaria. 



The adambulacral plates are short and do not extend far 

 up into the furrow ; each plate bears on its actinal edge a 

 transverse row of two or three large sabre-shaped spinelets, of 

 which the innermost often carries a large pedicelhuia, and 

 every alternate plate has also a prominent intra-ambulacral 

 ridge, on which stand two more spines, of which the outer 

 carries a pedicellaria almost as large and conspicuous as a 

 tube-foot and the inner a small cluster of small pedicellaria3. 

 The mouth-plates bear each two series of long needle-like 

 spines. 



Tube-feet quadriserial. 



Madreporiform plate very small and much hidden, with a 

 deep, coarse, vermicular sculpture like a peach-stone. 



Bay of Bengal, 1520 fathoms, Glohigerina-ooza. 



This fine species is recognized (i.) by its extremely small 

 disk not ditferentiated from the bases of the rays, and (ii.) by 

 the close capillary spinulation of the plates, which gives tiie 

 animal a uniformly hairy a{)pearance when dried. It appears 

 to be more nearly related to Zoroaster longicauda^ Perrier, 

 than to any other described species. 



39. Zoroaster planus J sp. n. 



Kays 5. R=16 r. R = 210 millim. in the 

 type specimen. 



Disk extremely small, depressed ; rays extremely long and 

 finely tapering, seraicylindrical, depressed. 



Abactinal surface of disk with slightly enlarged, close-set, 

 subhexagonal, primary radials and interradials surrounding a 

 mass composed of a dorso-central and radial under-basal plates 

 all of equal size ; all the plates are rather closely covered 

 with capillary spinelets, and the dorso-central and the radial 

 plates carry in addition a stout conical fluted spine ; the 

 narrow intervals between neighbouring plates each with one 

 papula and often with a single large pedicellaria. 



The rays have a longitudinal mid-radial row of large tumid 

 plates, each of which bears, besides the ca))illary spinelets, a 

 central stout, conical, fluted spine much like a pedicellaria ; 



