19 
Comissia A. II. Ciiirk. 
Key to the Species of the Genus Comissia. 
a' 25 — 30 cirrus segments; dorsal surface and distal edge of the ])innule segments 
very spinous; arms 100 mm. to 120 mm. long; cirri 15 mm. to 20 mm. 
long (Ph i 1 i ]) p i n c I si a n d s a n d M accl esfi el d Ba n k) peregriua^) 
a- Not more than 25 cirrus segments 
b* 16 — 25 (usually i8 — 25) cirrus segments of which the longest are from 
half again to twice 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 (Philij)pines to the Lesser Sunda and Kei Islands). . lutkeni 
b"- not more than 1 6 cirrus segments 
c' 14 — 16 cirrus segments 
d' longest cirrus segments from three to four times as long as broad ; 
cirri X\'I1, 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 5 5 mm. long (Philippines) liorridus -) 
d- longest cirrus segment not more than twice as long as broad 
e' cirri arranged in three closely crowded marginal rows ; P, with a 
comb of about 25 exceptionally long teeth; P^ with a comb of 15 
or 16 teeth; arms about 90 mm. long; cirri 14 mm. long (Christ- 
mas Island) pectinifer 
e- cirri • in a single marginal row; Pj with a comb of 9 — 11 teeth; 
P3 and the following pinnules without combs; arms about 60 mm. 
long; cirri 10 mm. to 11 mm. long (Moluccas) littoralis 
c" not more than 14 cirrus segments 
d^ arms about 60 mm. long; cirri arranged in a single marginal row 
gi 12 — 14 cirrus segments of which the longest is from two to two 
and one half times as long as the proximal diameter (Ceylon) chadivicki 
£= 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- arms not more than 45 mm. long 
e^ more than XX (XX— XXX) cirri, which are from 7 mm. to 9 
mm. long; arms 45 mm. long , 
f^ ossicles of the division series, brachials and pinnulars with 
strongly produced distal edges, which are armed with prominent 
r) Synonym Comissia dumetum .\. H. Clark. 
2) Comasttr horriJiis A. H. Clark, Proc. M. S. National Museum, vol. 39, 1911. p. 533. 
