GENERIC CHARACTERS OF HIPPOLYTIDAE 401 



Lysmata and Hippolysmata 



Rostrum long and slender in stage I. 



Carapace with supra-orbital spines and denticulate margin. 

 Abdominal somite 5 with or without dorso-lateral spines. 



Telson deeply indented; in late stages with two pairs of lateral spines and ten 

 terminal. 



Anal spine absent. 



Eyes borne upon long stalks. 



Antenna! scale segmented ; endopod a rod with one seta. 



Maxillule without outer seta. 



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



Exopods on legs 1-4. 



Leg 5 appearing before leg 4 and of enormous size; with propod greatly expanded. 



Probably nine larval stages. 



Tozeuma 

 Rostrum of extreme length. 



Supra-orbital spines very small ; margin of carapace smooth. 



Abdominal somite 3 with large dorsal spine ; somite 5 with lateral spines. 



Telson deeply indented, becoming forked, with three outer spines and ten terminal 



of which one forms the point of the fork. 



Anal spine absent, or present in late stages. 



Antenna! scale slightly segmented; endopod spine-like. 



Maxillule without outer seta. 



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



Exopods on legs 1-3. 



Probably nine larval stages. 



Saron (and allied forms) 



Body stout, very highly coloured. 



Rostrum present or absent in stage I ; later stout, and broad at base. 



Carapace without supra-orbital spines; anterior margin denticulate; with posterior 

 tooth. 



Abdominal somites without spines. 



Telson narrow in stages I and II, scarcely indented; later without lateral spines and 

 with ten terminal spines. 



Anal spine absent. 



Antennal scale segmented ; endopod spine-like. 



Exopod of maxillipede 3 with four apical setae. 



Exopods on legs 1-4. 



Number of larval stages uncertain. Reduced to four in one species. 



7-2 



