STALK-EYED CRUSTACEA 55 



horns. The orbits are deep and tubular ; the ocular 

 peduncles are very thin ; the superior orbital border is 

 cut by deep fissures. The basal joint of the external 

 antenna; is wide, and in uniting with the carapace closes 

 the orbit below ; the second joint is large, slightly flat, 

 and almost as long as the rostrum ; the third joint is thin 

 but well developed ; the flagellum is small. The anten- 

 nulary fossae are wide behind, very narrow in front. The 

 external maxillipedes are wide ; the fourth joint is auricu- 

 late at its antero-external angle, and deeply notched inside 

 for articulation with the next joint. 



The legs of the first pair of the male are of an equal 

 size, and are slightly swollen ; the fingers of the pincers 

 meet only at their tips when closed. The walking legs 

 are folded forwards and terminate in a very small joint, 

 very crooked, very pointed, and folded under the leg. 

 The abdomen of the male has seven joints. 



Range. — West Indian Sea. 



I. Sisyphus compressus. 



SisypJiiis coinprcssus . . Desbonne and Schramm, A. 



Milne Edwards. 



The regions on the carapace are not well marked ; 

 surface almost smooth. The gastric region has indica- 

 tions of four tubercles, of which the three anterior are 

 arranged transversely and the posterior one is on the 

 middle line ; there are two longitudinal projections on 

 the interorbital space. There is a very faintly marked 

 tubercle on the hepatic region, which forms a slight pro- 

 jection outwards ; there is a tubercle on the lateral edge 

 behind the branchio-hepatic groove. Rostral horns, thin, 

 flat, almost straight, and parallel to each other, being 

 separated by a narrow interval, are a little inflected below. 



