914 CRUSTACEA. 



Subfamily LYSIANASSIK3E. 



Besides the size of the base of the superior antennae, the Lysianas- 

 sinae appear to be peculiar in having the mandible very sparingly 

 dentate at extremity, and pointed, instead of having a long and thin 

 denticulate edge with a supplementary edge below. They are related 

 to some of the genera of Pontoporeinaa. The epimerals in all the 

 species are very large, and the body is much compressed. The eyes 

 are usually reniform, and the superior antennas are rather short and 

 rarely without an appendicular branch. The species also differ from 

 the Orchestiae in not having a narrow horizontal piece in the shell in 

 continuation of the epistome, directly over the mandible on either 

 side of the head. Moreover, the epistome and upper lip are of different 

 shape (see figures of Anonyx, on Plate 62). 



Lysianassa? brasiliensis. 



Corpus vcdde compressum, epimeris pergrandibns. Oculi reniformes. 

 Antennae lmce breves, quartd parte corporis breviores, flagello duplo lon- 

 giore, quam basis ferine 10-articidato, appendice 7-articulatd. Antennae 

 inferiores, dimidio corporis valde longiores, scepe reflexm et sub epimeris 

 celatce, basi brevi, articulo basis pemdtimo crasso. Pedes 4 antici 

 tenues; tertii quartis longiores; quinti sexti septimique consimiles, sen- 

 sim increscentes, articulis ptrimis niargine postico sermdatis. 



Body much compressed, epimerals very large. Eyes reniform. Supe- 

 rior antennae short, less than a fourth of the body in length, fla- 

 gellum twice as long as base, about ten-jointed, appendage seven- 

 jointed. Inferior antennae about two-thirds as long as body, often 

 bent backward and concealed beneath the epimerals, the base short, 

 and having penult joint of base very stout, four anterior feet similar, 

 slender; third longer than fourth; fifth to seventh gradually in- 

 creasing in length, posterior margin of first joint serrulate. 



Plate 62, fig. 1 a, animal, enlarged ; b, superior antenna; c, inferior 

 antenna ; df, leg of third pair ; e, fifth pair ; /, sixth pair. 



