b* the first pinnule of the free arms is on the second brachial ; there 

 is, at least on the outer arms, a pseudosyzygy between the first 

 two brachials, and on all the arms there is a syzygy between the 

 third and fourth ; all the division series 2. 



c 1 brachials beyond the basal wedge-shaped, broader than long 

 (sou thea stern Africa to the Malay Archipelago, 

 northern Australia, the Philippines, the Caroline 



Islands and southern Japan) Comatella 



c 3 brachials beyond the basal triangular, about as long as broad 

 d 1 cirri arranged in 25 closely crowded columns, usually of 



two each (K e i a n d P h i 1 i p p i n e 1 s 1 a n d s) . . . . Palaeocomatella 

 d- cirri arranged in irregular rows (northw es ter n Africa 

 and southwe stern Euro p e, and the Caribbean 



Sea) Neocomatella 



10 arms 



b 1 all the pinnules present 



c 1 cirri moderate or slender, but never excessively so ; at least 

 the last two segments no long-er than broad 



d 1 first and second segments of the proximal pinnules with 

 a very high and prominent carinate process of which the 

 outer edge, at least on the second segment, is parallel 

 with the longitudinal axis of the pinnule (Caribbean 



Sea and Gulf of Mexico) Leptonemaster 



d 3 no carinate process on the basal segments of the proxi- 

 mal pinnules 



e 1 the pinnules of the first two to four pairs bear ter- 

 minal combs ; the combs are confined to the distal 

 half of the pinnules and are composed of triangular 

 teeth which are not higher than the lateral diameter 

 of the segments which bear them ; none of the seg- 

 ments of the proximal pinnules are more than very 

 slightly longer than broad ; there is no modification 

 of the dorsal surface of the earlier brachials ; all of 

 the brachials, and the pinnulars, have very spinous 

 distal borders (e as ter n coast of Africa to the 

 Malay Archipelago and the Philippine 



Islands) Comissia 



e 3 terminal comb occurring only on the pinnules of the 

 first pair (P 1 and P a ) from one or both of which it 

 is sometimes absent ; the comb usually arises about, 

 or within, the proximal third of the pinnule, and 



