THE COPENHAGEN MUSEUM AND OTHER SOURCES. 419' 



Iphinotus, n. g. 



Body mucli depressed, pleon strongly flexed. Head immersed between the projecting 

 side-plates, square, feebly rostrate, with the eyes on the prominent front corners. First 

 four pairs of side-plates very large, outspread. Antennae short, subequal in length, the 

 first the broader. Uj)per lip Avith the convex distal margin rather flattened. Mouth- 

 organs in general as in Iphiplateia, the maxillijieds excepted, these having the fourth 

 joint of the palp well-develoj)ed, unguiform. Tlie limbs of the pera3on nearly as in 

 Iphiplateia, excej)t that the second and fourth joints in the fifth perseopods are very 

 much smaller than those in the third and fourth pairs. All the pleopodswith both rami 

 well developed, the peduncle in the second and third pau-s laterally produced in a long 

 and strong process. The first uropods slender, the second stout, both biramous, with 

 the peduncle much longer than the rami. The third uropods 'membi'anous, not 

 biramous, small. Telson entire. 



The name is derived from the prefix (<pi-, and viZroc, back. 



Iphinotus Chiltoxi, n. sp. (Plate 35 B.) 



The body is broad oval, with dorsal carina, of which the condition of the specimens no 

 longer allows a minute description. 



Head and eyes as in Pereionotiis Thomsoni. 



First aiiteinue. First joint large, distally widened ; second cylindrical ; third scarcely 

 longer than broad; flagelluni of three small joints, with the usual filaments. 



Second antennce. Moderately stout ; the last joint of the peduncle longer than the 

 penultimate ; flagellum of five joints, of which the last four are very small, all setose. 



Upper lip. Broader than deep, with converging hairs on the almost straight distal 

 margin. 



Mandibles, lower lip, and. maxillce as in Iphiplateia. 



MaxiUipeds. Inner plates with four apical spine-teeth, outer with minute sctules along 

 inner margin ; jmlp four-jointed, reaching considerably beyond the outer plates ; the 

 fourth joint unguiform. 



First and second gnathopods and first and second pera>opods. These are in general 

 as in Fereionotus Thomsoni, but the finger is abruptly narrowed at the sharp hooked 

 nail, and the setule of the inner margin is strong. 



Third and fourth perceopods. Second joint very large, only a little longer than broad, 

 but rather longer in the third pair than in the fourth ; the fourth joint greatly expanded, 

 the great hind lobe being nearly double the length of the front margin ; fifth joint a little 

 longer than the third ; sixth joint and finger as in the preceding pairs. 



Fifth perceopods. These are much smaller than the third or fourth, especially in regard 

 to the second and fourth joints ; the second, with its hind expansion, not quite reaching 

 the third joint ; the hind lobe of the fourth scarcely longer than its front margin. 



First pleopods. Peduncle not very long, and not expanded. 



Second pleojjods. Peduncle short, but produced on the inner side to a long and 



SECOND SERIES. — ZOOLOGY, VOL. VII. 58 



