CRUSTACEA. 



quartique paulo major es, tenues. Pedes quinti longiusculi; sexti 

 multo breviores, coxd laid, ellipticd, parte reliqud parce longiore; sep- 

 timiparvi, coxd paulo minore, parte reliqud breviore quam coxa. 



Head subrotund. Thorax seven-jointed, first segment shortest. 

 Antenna small, five-jointed, upper side sparingly and very short 

 setulose. Four anterior feet quite small; hand of second pair sub- 

 triangular, immoveable finger triangular, acutely serrate within and 

 without. Third and fourth pairs a little larger, slender; fifth pair 

 rather long; sixth much shorter, coxa broad, elliptical, the remain- 

 ing part but little longer than coxa; seventh pair small, the coxa 

 much smaller than coxa of preceding pair, and the following part 

 shorter than coxa. 



Plate 68, fig. 5 a, animal, enlarged; b, antenna; c, hand of second 

 pair. 



Off south end of Mindoro, January 24, 1842. 



Length, two lines. The third joint of the antenna is longer than 

 second or fourth; the terminal is short spiniform. 



Subfamily SYNOPINJE. 



Genus SYNOPIA. 



Frons subacutus. Antennce 4 longce, apertce, lmce appendiculatas. Pedes 

 2 antici subcheliformes ; proximi duo vergiformes, quatuor sequentes 

 subprehensiles, digito 2-articulato ; reliqui mediocres, unguiculati. 



Front subacute. The four antennae long, and not concealed. Two 

 anterior feet subcheliform ; next two vergiform; next four subpre- 

 hensile, finger two-jointed; remaining of moderate size, unguiculate. 



These animals have compressed bodies like the Gammaridea, and 

 a narrow head, a large part of which is covered with facets pertaining 

 to a single large compound eye, almost or quite as broad as the head. 



The head is narrow triangular and subacute in front. The thorax 

 has the seven segments distinct and nearly equal. The three ante- 



