ABT. IS SYNOPSIS OF CALANOID CEUSTACEA— MAESH 11 



3. Process of penultimate segment of fifth foot approximately per- 



pendicular to axis of foot 4 



Process of penultimate segment of fifth foot bent clistally 12 



4. Dorsal surface of furca and terminal abdominal segment armed 



with spines 5 



Dorsal surface of furca and terminal abdominal segment not 



armed with spines 11 



5. First abdominal segment not definitely enlarged laterally 6 



First abdominal segment more or less enlarged laterally 7 



6. Sides of last cephalothoracic segment not expanded laterally, 



rounded ; process of penultimate segment of fifth foot of 



female about one-half length of ultimate segment canadensis Marsh 



Sides of last cephalothoracic segment expanded in pointed 

 wings ; process of penultimate segment of fifth foot of female 

 nearly twice as long as ultimate segment americana Williams 



7. Proximal half of first al)dominal segment strongly expanded 8 



First abdominal segment expanded in two lobes on each side 10 



8. Wings of last cephalothoracic segment pointed 9 



Wings of last cephalothoracic segment rounded hirundo (Giesbrecht) 



9. Furca of female five to seven times as long as broad ; antennae 



slightly exceeding second thoracic segment; wings of last 



cephalothoracic segment extending outward aJ^is (Poppe)' 



Furca of female S to 12 times as long as broad; antennae equal- 

 ing or nearly equaling cephalothorax ; slenderer and smaller 

 than afflnis; wings pointed or rounded, not distinctly project- 

 ing outward hirundoides (Nordquist)' 



10. Wings of last cephalothoracic segment pointed ; furca three or 



four times as long' as broad raboti Richard 



Wings of last cephalothoracic segment blunt ; furca seven 

 times as long as broad composita Keiser 



11. Sides of last cephalothoracic segment not expanded outward. 



lacustris (Poppe) 

 Sides of last cephalothoracic segment markedly expanded out- 

 ward 13 



12. Wings of last cephalothoracic segment extended backward be- 



yond first abdominal segment; process of penultimate seg- 

 ment of fifth foot dentate on both sides, extended distad 

 beyond end of terminal spine of ultimate segment. 



herdmani Thompson and Scott 

 Wings of last cephalothoracic segment not reaching end of first 

 abdominal segment ; process of penultimate segment of fifth 

 foot dentate on outer side, not reaching ultimate segment. 



johanseni Willey 



13. Wings of last cephalothoracic segment expanded out and dis- 



tad ; process of penultimate segment of fifth foot not dentate. 



gracilis (Sars) 

 Wings of last cephalothoracic segment recurved at tip ; process 



of penultimate segment of fifth foot dentate tolli Rylov 



'• Synonym : E. adleri. 



* Olofsson considers hirundo and JitrundoidcK as variations of affinis. Xordquist states 

 Mrundoides to be the connecting link between affinis and hirundo. Schmeil considers 

 hirundo and hirundoides good species. DeLint considers hirundoides a good variation. 



