KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 21. N:0 5. 



The first pair of antennas straight, the first joint of the flagellum large, the 



following few in number, terminal: 

 a 1. Tiie head small, not tumid. 



aa 1. The first joint of the flagellum of the first pair of antenna; styli- 



forni, not tumid . . I. Tyroiiitlse. 



aa 2, The first joint of the flagellum of the first pair of antennae high, 

 tumid. 



aaa 1. The seventh pair of pereiopoda not transformed 2. Laoceoliilx. 



aaa 2. The seventh pair of pereiopoda transformed 3. Vibiliil^. 



a 2. The head large, tumid. 



aa 3. The first joint of the Hagelluui of the first pair of antenna3 

 tumid. 



aaa 3. The seventh jjair of pereiopoda transformed. 4. Cjilopoilhlx. 



aaa 4. The seventh pair of pereiopoda not transformed 5. Paraphroiiiniiil». 



aa i, The first joint of the flagellum of the first pair of antennse 



styliform, not tumid 6. Thauniatopsitlx. 



a 3. The head with the pereion transformed into a balloon-like bladder 7. Hliniouectid». 



B. The first pair of antenna; straight, the first joint of the flagellum large, the 

 following many in number, filiform (o^), terminal. 

 b 1. The uropoda normal, with rami. 



bb 1. The maudibles with palp .'... 8. Hyperiidx. 



bb 2. The mandibles without palp 9. Phroniiuiil<e. 



b 2. The iu"opoda transformed, without rami. Last five pairs of pereiojioda 



prehensile organs 10. ADchjIomeridie. 



The first pair of antenna? eurved, the first joint of the flagellum large, the 



following few in number, subterminal. Seeond pair angularly folded (ef)- 

 C 1. The femur of the sixth pair of pereiopoda not operculiform, the rest 

 of the leg articulating terminally. 

 CC 1. The first pair of antenna; fixed at the anterior sidc of the head II. Eiiphorriilic. 

 CC 2. The first pair of antenna; fixed at the inferior side of the head. 

 CCC 1. The anterior part of the head verv shortly produced, or 



not produced 12. Tryphieiiiilse. 



CCC 2. The anterior part of the head produced into a rostrum, 



longer than half the rest of the head 13. Oxycephalidae. 



