197 



e 3 P„ resembles P„ and the succeeding pinnules, and often 

 bears a more or less developed gonad ; all of the lower 

 pinnules are invariably present Bathymetrinae 



i st Subfamily Antedoninae A. H. Clark. 



Key to the Genera of the Subfamily Antedoninae. 



a 1 P 2 of the same length and character as P., and the following pinnules, and 

 much shorter than (usually about half as long as) P, 



b 1 pinnule segments with unmodified, or at the most very finely spinous, 

 distal edges-, size medium, the arms rarely under 45 mm. in length 

 (Norway to the Gul f of Guinea, including the ent ir e Medi- 

 terranean basin and the east Atlantic islands; Caribbean 



Sea to Rio de Janeiro, Brazil; o — 445 Me tres) Antedon 



b 3 pinnule segments with strongly produced, everted and coarsely spinous 

 distal edges ; size small, the arms never over 70 mm. and rarely over 

 45 mm. in length (southern coasts of Australia northward 

 throughout the East Indian region to southern Japan; o — 275 



Metres) Compsometra 



a 3 P, not of the same length and character as P, and the followine pinnules, 

 and never only half as long as P T 

 b 1 P., of the same length and character as the following pinnules; P„ much \J^ 



lonoer than P, , resemblingf P which is still longer 



c 1 Pj longer than the cirri, becoming very slender and flagellate distally, 

 composed of about 40 segments (Ceylon to the Society Islands ; 



o — 47 Metres) . . Mastigometra 



c 3 Pj shorter than the cirri, less slender and more or less stiftened, com- 

 posed of 18 — 21 segments (Moluccas to China, end eastward 



to the Society Islands; o — 397 Metres) Euantedon 



b 3 P., not of the same length and character as the following pinnules 

 c 1 P 3 much the longest and stoutest pinnule on the arm 



d 1 the distal ends of the cirrus segments do not overlap the bases of 

 those succeeding; the dorsal edge of the outer four to six cirrus 

 segments is about as long as the proximal border; the brachials 

 have strongly produced and coarsely spinous distal edges (F lor es 

 to Borneo and the Philippine Islands: o — 502 Metres) . Toxometra 

 d 3 the cirrus segments have produced distal ends which overlap the 

 proximal ends of those succeeding; the outer cirrus segments are 

 much longer than their proximal width ; the branchials have smooth, 

 or only very finely spinous, distal edges 

 e 1 smaller, with not over 16 cirrus segments; cirri less numerous, 



