246 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



KEY TO THE 3PECIE3 IN THE GENUS COMISSIA 



a'. More than 25 cirrus segments. 



bK Cirri numerous, XXX-XL; arms 150-170 mm. long (Bonin Islands; 183 meters). 



magnifica, p. 247. 

 b-. Cirri few, XIII-XV; arms 100-120 mm. long (Philippine Islands and Macclesfield Bank; 



100-1 10 meters) peregrina, p. 248. 



a^. Not more than 25 cirrus segments. 

 6'. Cirrus segments 16-24 in number. 



c'. Fourth and following cirrus segments with the distal dorsal and dorsolateral edge everted 

 and finely spinous, this on the last 2 or 3 becoming a single blunt spine or tubercle; fourth 

 (occasionally the fifth) a strongly marked transition segment; P^ with a comb (Lesser 



Sunda Islands to Queensland and the Philippines; 29-135 meters) liitkeni, p. 249. 



c^. Outer cirrus segments simply with a low subterminal tubercle; no strongly marked transition 

 segment; P, without a comb (Bass Strait; 119 [?91]-183 [?311] meters). 



[Comanthoides spanoschistum, p. 241]. 

 b^. Not more than 16 cirrus segments. 

 c'. Cirrus segments 14-16 in number. 



d'. Longest cirrus segments three to four times as long as broad; cirri XVII, 14-15, 10 mm. 

 long; cirri arranged in 2 irregular rows on the centrodorsal; elements of the division 

 series with slightly prominent and finely spinous distal ends; brachials with strongly 

 overlapping and very spinous distal edges; arms 55 mm. long (Philippines; 106 meters). 



horridus, p. 254. 

 (P. Longest cirrus segment not more than twice as long as broad. 



e'. Cirri arranged in 3 closely crowded marginal rows; Pi with a comb of about 25 excep- 

 tionally long teeth; P, with a comb of 15-16 teeth; arms about 90 mm. long (Christ- 

 mas Island and the Kei Islands) pectinifer, p. 255. 



e^. Cirri in a single marginal row; P, with a comb of 9-11 teeth; P3 and the following pin- 

 nules without combs; arms about 60 mm. long; cirri 10-11 mm. long (Karkaralong 



and Philippine Islands) littoralis, p. 256. 



c^. Not more than 14 cirrus segments. 

 d'. Arms about 60 mm. long. 



e'. Cirrus segments 12-14, the longest from two to two and one-half times as long as the 



proximal width (Ceylon; 51-183 meters) chadwicki, p. 257. 



e'. Not more than 12 cirrus segments, the longest about four times as long as the proximal 

 width. 

 /'. Cirrus segments 10-12 in number; cirri 5-6 mm. long, with the penultimate segment 

 twice as broad as long; IBri about four times as broad as long, in lateral apposition; 

 axillaries twice as broad as long; P, 7 mm. long with about 25 segments, the ter- 

 minal comb with 7-8 small and well separated teeth and similar, but smaller teeth 

 on the opposite side of the segments; P, without a comb (Philippines; 106 meters). 



scituhis, p. 274. 

 p. Cirrus segments 9-10 in number; cirri 8 mm. long, with the penultimate segment 

 about as long as broad; IBr, six to eight times as broad as long; axillaries not 

 greatly broader than long; Pj 12-14 mm. long with 40 segments, the terminal 

 comb with 15-17 long curved teeth which are set very close together basally; 

 combs occur as far as P, (Palawan to the Kei Islands; 90-93 meters)., hispida, p. 258. 

 cP. Arms not more than 45 mm. long. 



e'. More than XX (XX-XXX) cirri, which are 7-9 mm. long; arms 45 mm. long. 

 /'. Elements of the division series, brachials and pinnule segments with strongly pro- 

 duced distal edges which are armed with prominent spines (Korean Straits to the 



Lesser Sunda Islands; 113-210 meters) spinosissima, p. 259. 



p. Edges of the ossicles of the division series smooth and not produced; edges of the 

 brachials and pinnule segments not unusually spinous (southern Japan to the Kei 

 and Lesser Sunda Islands; 73-731 meters) parvula, p. 262. 



