290 STALK-EYED CRUSTACEA 



angle ; the interior subocular lobe is moderately developed, 

 and does not exclude the external antennae from the 

 orbital cavity. Eye-peduncles short, robust. Internal an- 

 tennae transversely or almost transversely plicated. The 

 basal joint of external antennae is very short, does not 

 reach the front, and is slightly produced at its antero- 

 lateral angle ; flagellum of moderate length. Endostomian 

 ridges usually distinctly developed. External maxillipedes 

 narrow, with a rhomboidal gape ; the external appendage 

 small and slender. First pair of legs, in the male, usually 

 subequal and moderately developed ; fourth joint trigonous ; 

 fifth joint usually angulated, without a spine on the 

 interior margin ; palm slightly compressed ; fingers with 

 acute or slightly excavated tips. Walking legs moder- 

 ately elongated ; fourth joint compressed, and usually 

 armed with a subdistal spine or tooth on superior margin ; 

 last joint styliform, slightly compressed, and without 

 spines. 



Range. — All tropical and subtropical seas ; in shallow 

 water or on the shore. 



Synopsis of the Species. 



1. Carapace square and depressed. 

 Front deeply excavated. 



There is no tooth on lateral border behind external 

 orbital angle. 



Epistome granular. — (S. ciiiei-ea.) 



2. Carapace broader behind than in front ; legs long 

 and thin. — {S. atigustipes.) 



3. Frontal lobes not well marked ; no median groove. 

 Anterior part of carapace without folds. — {S. 



viiniata^ 



4. Frontal lobes well marked, with a median 

 groove. 



