80 ^rr. A. Alcock on 



two or tliree adanibiilacral plates, tliey bear two large actinal 

 spines, and tlic most central (adoral) furrow-spine is conspic- 

 uously enlarged. 



The actinal intcrradial areas form small crcfwents, the horns 

 of Avliicli touch the proximal end of the third infero-marginal 

 ])latos ; each area carries 21 to 24 small ])lates in three con- 

 centric rows, the ]ilates being closely covered with capillary 

 spinelets, which occasionally fall into the semblance of a 

 pectiniform pedicellaria, and sometimes bearing also a central 

 s])ine. 



Anus subcentral. ]\Iadreporiform plate small, placed about 

 midway between the centre and the margin of the disk. 



Fajiularia small and comj)act, each with about 10 papulge. 



Ko true pedicellariffi. 



CJulf of Manaar, 597 fathoms, green mud. 



Dyt ASTER, Sladen. 

 8. Dy taster exilis, Sladen. 



Dytoster e.vilisy Sladen, ' CLallenger ' Asteroidea, p. 05, pi. ii. figs. 3 

 and 4, pi. iv. figs. 9 and 10 ; and iu Wood-Mason and Alcoclc, 

 "Indian Deep-sea Dredging,'' Ann. & Mag. Nat. Hist., Dec. 1891, 

 p. 429. 



This species has several times been met with in the Bay 

 of Bengal between 1748 and 1924 fathoms on Glohigerina- 

 oo^e. 



9. Dytaster anacanthus, Alcock and Wood-Mason. 



Lytmicr anacanthtts, Ann. & Mag. Nat. Hist., Dec. 1801, p. 429. 



Bays 5. B = about 6 r. B=82 millim. in the 

 type specimen. 



Disk small, irregularly inflated ; rays long, narrow, rigid, 

 ta])ering ; interbrachial arcs rather acute. 



Abactinal surface densely crowded with small paxillse 

 formed of narrow tabulae capped with numerous close-set 

 granules or papilliform spinelets, those in the centre of the 

 disk and in a narrow band along the middle of the rays being 

 .^mailer tlian those elsewhere, and those on the rays being 

 di.«posed in obliquely transverse rows on each side of this 

 ujcdian band. 



The supero-marginal plates, 40 to 4b in number, are 

 entirely vertical and lateral in position, almost perfectly 

 .square, except in the intei brachial ares, where their vertical 

 diameter is greater, and are uniibrmly covered with papilli- 

 iurni granules without any enlarged .spines or tubercles. 



