30 U.S. NATIONAL MUSEUM BULLETIN 236 



4. Furcal rami about 6 times as long as broad . . . . C pygmaea G. O. Sars 

 Furcal rami distinctly shorter, not more than 4 times as long as broad . . 5 



5 Antenuule composed of 13 free segments C. pacifica Smirnov 



Antennule composed of 10 free segments 6 



6. Furcal rami about twice as long as broad or slightly shorter 7 



Furcal rami at least 2^2 times as long as broad or longer 12 



7. Little or no difference in size between internal and external spine of terminal 



segment of leg 5 10 



Internal spine of terminal segment of leg 5 longer than external spine, or 

 external spine longer than internal spine 8 



8. Internal spine of terminal segment of leg 5 longer than ex-ternal spine. 



C. mediterranea Steuer 

 External spine of terminal segment of leg 5 longer than internal spine . . 9 



9. External spine of terminal segment of leg 5 about twice as long as internal 



spine or longer. Furca as long as anal somite or shorter; seta at external 

 furcal border inserting at middle of that border. 



C. brachystylis G. O. Sars 



External spine of terminal segment of leg 5, 1% to l}i times as long as internal 



spine. Furca longer than anal somite; seta at external border of furca 



inserting proximally in middle of that border C. kieferi Schafer 



10. 1st segment of endopodite of mandible with 2 setae . . . C. vachoni Nicholls 

 1st segment of endopodite of mandible with 3 setae 11 



11. Number of setae on the 3rd exopodal segment of legs 1 to 4 is 4.5.5.5. 



C. adriatica Petkovski 

 Number of setae on the 3rd exopodal segment of legs 1 to 4 is 4.5.4.4. 



C. psammophila Steuer 



12. Internal spine on terminal segment of leg 5 longer than external spine. 



C. latipes Schafer 

 External spine on terminal segment of leg 5 longer than internal spine . . 13 



13. External spine of terminal segment of leg 5, 2)^-3 times as long as internal 



spine C. esilis Brian 



External spine on terminal segment of leg 5 twice as long as internal spine 

 or shorter 14 



14. No internal seta on coxa and no external seta on basis of leg 4. 



C. ensifera Grandori 

 Internal and external seta on coxa and basis of leg 4 present 15 



15. Furca 3-4 times as long as wide 16 



Furca not more than 2Ji times as long as wide 19 



16. Seta at external furcal margin inserting on proximal third of that margin, 



short and nude C. gracilis Glaus 



Seta at external furcal border inserting halfway along that margin or slightly 

 lower; seta either nude or plumose 17 



17. Seta at external margin of furcal border inserting distinctly under the middle 



of that border, short and plumose C. phoenicica Lindberg 



Seta at external furcal border placed halfway along that border or very 

 slightly above the middle 18 



18. Seta at external furcal border plumose; apical furcal setae thickened. Termi- 



nal segment of leg 5 ovate, internal and external spine on that segment 



of about the same length C. crassisetosa Herbst 



Seta at external furcal border nude, placed slightly above middle of external 

 margin; apical furcal setae normally developed. Terminal segment of 

 leg 5 elongate, external spine of that segment longer than internal spine. 



C. kieferi elongata Herbst 



