80 Mr. A. Alcock on 



two or tluee adarabulacral plates, tlicj bear two large actinal 

 spiMcs, and the most central (adoral) furrovv-.spine is conspic- 

 uously enlarged. 



The actinal interradial areas form small crescents, the horns 

 of which touch the proximal end of the third iiifero-marginal 

 plates; each area carries 21 to 24 small plates in three con- 

 centric rows, the plates being closely covered with capillary 

 spinelets, which occasionally fall into the semblance of a 

 pectiniform pedicellaria, and sometimes bearing also a central 

 spine. 



Anus subcentral. Madreporiform plate small, placed about 

 midway between the centre and the margin of the disk. 



Papularia small and compact, each with about 10 papulse. 



No true pedicellaria?. 



Gulf of Manaar, 597 fathoms, green mud. 



Dytaster, Sladen. 

 8. Dytaster exilis^ Sladen. 



Dytaster e.rilis, Sladen, ' Cliallenger ' Asteroidea, p. 05, pi. ii. figs. 3 

 and 4, pi. iv. figs. 9 and 10 ; and in Wood-Mason and Alcock, 

 "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 Olohigerina- 

 ooze. 



9. Dytaster anacanthiis, Alcock and Wood-Mason. 



Dytaster anacanthus, Ann. & Mag. Nat. Hist., Dec. 1891, p. 429. 



Eays 5. E,= about 6 r. R = 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 

 I'ormed of narrow tabulse 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 

 smaller than those elsewhere, and those on the rays being 

 disposed in obliquely transverse rows on each side of this 

 median band. 



The supero-marginal plates, 40 to 45 in number, are 

 entirely vertical and lateral in position, almost perfectly 

 square, except in the intei brachial arcs, where their vertical 

 diameter is greater, and are uniformly covered with papilli- 

 form granules without any enlarged spines or tubercles. 



