400 DISCOVERY REPORTS 



Maxillule with outer seta. 



Exopods of maxillipede 3 with three terminal setae in stage I. 



Exopods on legs i and 2 only; legs 3-5 remaining apparently non-functional. 



From four to nine larval stages. 



Chorismus 



Rostrum long and rather stout. 



Carapace with supra-orbital spines ; margin smooth. 



Abdominal somites without spines. 



Telson broad, with twenty spines in stage I. 



Anal spine present. 



Antennal scale segmented, with one outer seta; endopod a long flagellum in stage I. 



Maxillule without outer seta. 



Exopod of maxillipede 3 with three apical setae in stage I. 



Exopods on legs 1-3. 



Development greatly abbreviated. 



Spirontocaris 



Rostrum absent in stage I (except in S. sptnus), remaining very short and broad. 

 Carapace with small supra-orbital spines and denticulate margin. 

 Abdominal somite 5 with or without dorso-lateral spines. 



Telson rather deeply indented, in late stages with two pairs of lateral spines and twelve 

 terminal. 



Anal spine present from stage I. 



Antennal scale segmented, endopod spine-like. 



Maxillule without outer seta. 



Exopod of maxillipede 3 with three terminal setae in stage i . 



Exopods on 2, 3 or 4 pairs of legs. 



Legs 3-5 long, slender, functional. 



Development in four species greatly abbreviated. 



Caridion 



Rostrum present in stage I ; becoming long and slender. 

 Supra-orbital spines present ; margin of carapace denticulate. 

 Abdominal somite 5 with dorso-lateral spines. 



Telson very deeply indented; with two pairs of lateral spines and twelve terminal 

 in late stages. 



Anal spine present in late stages. 



Antennal scale segmented; endopod a rod with two terminal setae in stages I and II. 



Exopod of maxillipede 3 with three terminal setae in stage I. 



Exopods on legs 1-4. 



Legs 3-5 very long and slender, propodus sometimes expanded slightly. 



Nine larval stages. 



