NEOMORPHASTER.—ZOROASTER. 87 
2. NEOMORPHASTER. 
Glyptaster, Sladen, Chall. Narr. i. (1885) p. 612 (non Glyptaster, Hall). 
Neomorphaster, Sladen, Chall. Rep, Ast. (1889) p. 486. 
A Stichasterid in which the primitive calycinal plates remain 
well marked on the disk, but in which the adambulacral plates do 
not form projecting angles into the ambulacral grooves. By the 
former character distinguished from Stichaster, by the latter from 
Zoroaster ; otherwise it might well be placed in either of these 
genera. 
1. Neomorphaster eustichus. 
Neomorphaster eustichus, Sladen, Chall. Rep, Ast. (i889) p. 
pl. lxvi. tigs. 3 & 4, & pl. Lxviii. figs. 9 & 10. 
R is equal to rather more than 4 r, 
Disk moderate, pretty deep at the sides, with a circlet of large papules 
close to its margin ; the plates of the disk arranged radially and inter- 
radially only, save in the centre, where there may be one or more. 
Aiong the arms there 1s a central row of ossicles, and on either side 
of it there are four rows ; these are all arranged very regulariy and 
the plates are separated by large papul and ornamented with a spiny 
granulation. On the adambulacral plates there are ten lines of simple 
subequal spines. 
Colour in spirit, yellowish white. 
Breadth of arm Height of 
R. * T: at base. disk. 
48 ial 9 9 
40 9 8:7 75 
382 a 6 45 
21 5 4-5 3:7 
Dredged off S.W. coast of Ireland (51° 1' N., 11° 50' W., 759 
fms.) ; and off Azores (900 and 1000 fms.). 
3. ZOROASTER. 
Zoroaster, Wyv. Thoms. Depths of the Sea (1873) p. 154; Perr. Nouv. 
Arch. Mus. vi. (1884) p. 195; id. Ann. Sci. Nat. xix. (1885) art. 8, 
p- 16; Slad. Chall. Rep. Ast. (1889) p. 416, 
Arms five, more or less rigid, elongated, arched ; covering spines 
well developed. Ambulacral tubes quadriserial at base of arm, with 
small sucking-disks ; adambulacral plates hidden in groove. 
- In the definition of this genus and in the assignment of it to the 
family Stichasterida, it will be seen that I follow Professor Perrier’s 
earlier arrangement rather than that since proposed by Mr. Sladen, 
for which no definite reasons are conclusively stated. 
* ‘These measurements are taken from a series of specimens dredged from 
the west of Fayal, Azores (St. 73, Voy. ‘ Challenger ’), 
