THE COPENHAGEN MUSEUM AND OTHER SOUECES. 415 



second uropods biramoiis, the second smaller than the first ; third uropods one-jointed, 

 very small. Telson entire. 



The name is derived from the prefix (<?(-, signifying strength, and TrAareTa, broad. 

 Only one species is at present known. 



Iphiplateia Whiteleggei, n. sp. (Plato 34.) 



The body forms a broad oval ; the basal joint in the first antennse, and the second 

 joint in the last three pairs of perseopods, helping to complete the figure. It is dorsally 

 a little convex and smooth, or feebly angiilar along the centre ; the last segment of the 

 perseon slightly upraised, and the first segment of the small pleon projecting backward 

 in a prominent tubercle, the remainder of the pleon being rather tightly folded under 

 the body, its sixth segment dorsally undeveloped. The head is embedded between the 

 subtriangular first side-plates, which project forward beyond its rounded corners, these 

 being almost on a level with the short obtuse rostrum. The second side-plates oblong; 

 the third a little more widened distally ; the fourth very broad, excavate behind ; the 

 fifth, sixth, and seventh small, bilobed, the front lobe the larger. 



The eyes are small, oval, dark, close to the corners of the head. 



First mitennce. First joint nearly as broad as long, with large advanced inner lobe ; 

 second similar in shape, but much smaller ; third narrow, not lobcd ; flagellum very 

 small, two-jointed, second joint minute. 



Second antennce. Basal joints, small, obscure, seemingly soldered to underside of head ; 

 penultimate joint of peduncle rather larger than ultimate, neither large ; flagellum two- 

 jointed, small, scarcely so long as last joint of pedimcle, second joint scarcely visible. 



Epistome rounded above. On either side of it is a small, rounded oval, pellucid space 

 in the ventral surface of the head. 



Upper lip. At the centre of the margin are two oval spaces, each enclosing a tuft of 

 short hairs, the two tufts not convergent. 



Jlandibles. Cutting-edge quadridentate ; sjiine-row consisting of three minute 

 spinules ; molar tubercle wanting, unless represented by a broad pellucid spine tipped 

 with a setule. 



First maxillcB. Of the apical spines four form a row, the fifth being set beside them 

 near the centre. 



Second maxillce. Inner plate with truncate apical margin, fringed with five very short 

 and small but rather broad spines, the innermost the largest ; the outer plate very 

 narrow, tipped with a few sjoinules. The mandiljles and maxillte are in this genus not 

 only exceedingly small, but so closely compacted that it is difiicult to sej)arate theiu. 



Maxillipeds comparatively wide. Inner plate with four minute spine-teeth on the 

 truncate apex, outer plate rather broad, the inner margin carrying six widely -sjjaced 

 insignificant spine-teeth ; first three joints of palp not greatly ditfei'ing in length ; second 

 much broader than third ; fourth small, cylindrical, and so pellucid that its margins may 

 easily be mistaken for a couple of seta?, its apex tipped with a very long seta. 



First gnatliopods. Second joint not nearly reaching the distal border of the side-plate ; 

 third as long as fourth, the latter, as usual, underriding the wrist; the wrist or fifth joint 



