19 



Comissia A. H. Clark. 

 Key to the Species of the Genus Comissia. 



a T 25 — 30 cirrus segments; dorsal surface and distal edge of the pinnule segments 

 very spinous; arms 100 mm. to 120 mm. long; cirri 15 mm. to 20 mm. 



long (P h i 1 i p p i n e I s 1 a n d s and M a c c 1 e s f i e 1 d Bank) peregrina v ) 



a 2 Not more than 25 cirrus segments 



b 1 16 — 25 (usually 18 — 25) cirrus segments of which the longest are from 

 half again to tvvice as long as broad ; arms 70 mm. to 100 mm. long ; cirri 

 15 mm. to 17 mm. long; pinnule segments not so spinous as in the pre- 

 ceding (Philippines to the Lesser Sunda and Kei Islands). . lütkeni 

 \r not more than 1 6 cirrus sesrments 



o 



c 1 14 — 16 cirrus segments 



d 1 longest cirrus segments from three to four times as long as broad ; 

 cirri XVII, 14 — 15, 10 mm. long, arranged in two irregular rows 

 on the centrodorsal ; ossicles of the division series with slightly pro- 

 minent and finely spinous distal ends ; brachials with strongly over- 

 lapping and very spinous distal edges ; arms 55 mm. long (Philippines) horridus") 

 d- longest cirrus segment not more than twice as longf as broad 



e 1 cirri arranged in three closely crowded marginal rows ; Y Y with a 

 comb of about 25 exceptionally long teeth ; P t with a comb of 15 

 or 16 teeth; arms about 90 mm. long; cirri 14 mm. long (Christ- 



maslsland) pectinifer 



e 2 cirri in a single marginal row ; P l with a comb of 9— r u teeth; 

 P 8 and the following pinnules without combs ; arms about 60 mm. 



long; cirri 10 mm. to 11 mm. long (Moluccas) littoralis 



c 2 not more than 14 cirrus segments 



d 1 arms about 60 mm. long ; cirri arranged in a single marginal row 

 e 1 12 — 14 cirrus segments of which the longest is from two to two 



and one half times as long as the proximal diameter (Ceylon) chadwicki 

 e 2 9 — 10 cirrus segments of which the longest is about four times 

 as long as the proximal diameter (Kei and Philippine Is- 

 lands) • . hispida 



d 2 arms not more than 45 mm. long 



e 1 more than XX (XX — XXX) cirri, which are from 7 mm. to 9 

 mm. long; arms 45 mm. long 



f 1 ossicles of the division series, brachials and pinnulars with 

 strongly produced distal edges, which are armed with prominent 



1) Synonym Comissia dumetum A. H. Clark. 



2) Comaster horridus A. H. Clark. Proc. L'. S. National Museum, vol. 39, 191 1. p. 533. 



