i6- 



Aglaometra A. H. Clark. 



Key to the Species of the Genus Aglaometra. 



a 1 Cirri relatively slender, less than half as long as the arms 



b 1 stouter and more rebust; the edges of the segments of the IBr series and 

 of the earlier brachials are but very slightly if at all everted, and are armed 

 with exceedingly fine spines, or are quite smooth ; arms about 130 mm. long; 

 cirri 60 mm. long, with 62 — 69 segments (Moluccas; 567 Metres) . . vera 

 b 3 more slender; the edges of the segments of the IBr series and of the earlier 

 brachials are more strongly everted, and more prominently spinous; arms 

 130 mm. long; cirri more slender than in the preceding, 45 mm. to the 55 mm. 

 long, with 59 — 64 segments (Philippine Islands; 612 — 945 Metres). . propiuqua 

 a 2 Cirri long and stout, more than half as long as the arms 



b 1 large and conspicuous water pores are present, formed by the cutting away 

 of the distal angles of the IBr n and of the first brachials both interiorly and 

 exteriorly, and the inner distal angle of the third brachial (the hypozygal 

 of the first syzygial pair); arms 125 mm. long; cirri 60 mm. to 65 mm. 

 long, with 63 — 64 segments (extreme western end of New Guinea; 



798 Metres) stilcata 



b 2 no water pores ; base of animal (IBr series and arm bases) more compact 

 c 1 radials large and conspicuous, more than half as high as the IB^, the 

 plane of their outer surface everywhere nearly parallel with the dorsoventral 

 axis, forming a band of equal height all around the calyx between the 

 centrodorsal and the lBr x ; .no subradial clefts ; a prominent broad low 

 rounded tubercle near the lateral borders of the axillaries; arms 150 mm. 

 long; cirri X — XX, 66, 90 mm. long (Philippine Islands; 889 



Metres) eupcdata 



c 3 radials entirely, or mostly, concealed, their central portion recumbent, 

 making a very large angle with the dorsoventral axis, never forming a 

 regular and uniform band between the centrodorsal and the IBr x ; con- 

 spicuous subradial clefts are present; no tubercles on the dorsal surface 

 of the axillaries 



d 1 larger and stouter, with longer and stouter cirri ; borders of the ossicles 

 of the IBr series and the lower brachials everted and "fringed with 

 strong spines;" arms 100 mm. long; cirri 80 mm. long with 65 segments 

 (Meangis Islands and Moluccas; 900 — 1264 Metres). . . . valida 

 d 2 smaller and more slender, with shorter and relatively more slender 

 cirri; borders of the ossicles of the IBr series and the lower brachials 

 smooth, or nearly so ; arms 90 mm. long; cirri 50 mm. long with 70 

 segments (Kermadec Islands; 11 34 Metres) incerta 



