452 STALK-EYED CRUSTACEA 



attached to the base a large membranous appendage ; 

 and, in the female, is small and rudimentary The 

 swimming organ is large and strong ; the lateral plates 

 are broad and foliaceous, and strengthened by a longi- 

 tudinal ridge that traverses the external margin of the 

 outer plate and terminates in a sharp tooth. The telson 

 is tapering. 



The gills are attached to the body wall, to the mem- 

 brane between the first joint of the two maxillipedes, and 

 all the legs except the last pair, and the body ; there 

 is a branchial process on all these limbs except the 

 posterior two pairs, but no gills are attached to the first 

 joint of any of these limbs. 



Range. — Atlantic and Pacific Oceans. 



I. Penaeus brasiliensis. 



Pcncrns brasiliefisis Latreille, H. Milne 



Edwards. 



The flagella of the internal antennae are short, not as 

 long as the rostrum, and flat. The rostrum has nine 

 teeth above and three below. There is a median groove 

 which extends from the base of the rostrum to the 

 posterior border of the carapace. 



Range. — Berbice River, British Guiana, Brazil, 

 Florida, South Carolina, West African Coast. 



2. Sicyonia. 



Sicyouia . Spence Bate, Milne Edwards. 



Body hard ; anterior portion of the carapace and 

 posterior portion of the abdomen more compressed than 

 the central region. The rostrum is short, usually toothed 

 above. Eye-stalk short. Eye reniform. 



