STALK-EYED CRUSTACEA 499 



Synopsis of the Genera. 



I. Sixth abdominal segment distinct, not fused with 

 last segment ; rostrum without antero-lateral spines. 



A. Hind body narrow and thick. 



a. Dactyle of raptorial claw dilated at base, and un- 

 armed ; primary marginal spine of telson very large, 

 with one or two secondary spines on each side between 

 the submedian and the intermediate. — {Gonodactylns^ 



b. Dactyle of raptorial claw not dilated at base, usually 

 armed with marginal spines; submedian spines of telson 

 tipped with movable spinules ; from one to three secondary 

 spines between the submedian and intermediate. — {Pseudo- 

 squilia?) 



B. Hind body depressed and wide. 



c. Dactyle of raptorial claw not dilated at base, but 

 usually armed with marginal spines. 



c^. Primary marginal spines of telson large, with more 

 than four secondary spines between the intermediate and 

 the submedian ; dactyle of raptorial claw usually with no 

 more than six marginal spines. — {Sqtnila^ 



I. Gonodactylus. 



Gonodactylus . . Latreille, Miers, Brooks, H. Milne 

 Edwards, Dana. 



Hind body narrow and thick, convex. The sixth 

 abdominal segment separated from the telson by a 

 movable joint. The dactyle of raptorial claw enlarged 

 at base, without marginal spines. The rostrum has no 

 antero-lateral spines. Primary marginal spines of telson 

 very large, with one or two secondary spines on each side 

 between the submedian and the intermediate. 



Range. — Atlantic and Pacific Oceans. 



