12 A. O. WALKER. 



Mandibles as in .1. ncglcctus, Hansen,* but the projection from the molar tubercle, 

 which appears to be membranaceous, is less prominent. The third joint of the palp is 

 straight. 



First and second maxillse as in A. neylectu*. 



Maxillipcds as in A. neglectus. 



First gnathopods : Side plates small, rather wider than deep. First joint as long- 

 as all the rest, four times as long as wide. Wrist longer and wider than the hand, 

 unequally setose on the hind margin. Hand not subchelate, narrowing distally, the 

 front margin convex, the hind slightly concave, spinulose along its entire length, with 

 four spines at unequal intervals. 



Second gnathopods : Side plates semi-oval, extending to about one-third of the first 

 joint. First joint subequal to the next three united, widening to about one-fourth of 

 its length from the distal end, then narrowing. Wrist longer and wider than the hand, 

 the hind margin densely setose ; hand with subparallel margins, both setose. Dactylus 

 well developed. 



First and second perseopods : Side plates rounded below, those of the second pair 

 obtusely augulated about the middle of the hind margin. The fourth joint is about 

 half as long and twice as wide at the distal end as the fifth ; the hind margin of the 

 latter terminates in an acute angle. 



The remaining perseopods are subequal in length and structure, robust, the third 

 joint expanded, the fourth with both margins produced downwards ; the hind margins 

 of the first joints in the third and fourth pairs are smooth, except the lower part, which 

 is obscurely crenate ; in the fifth pair the whole margin is serrate. 



First and second uropods : Peduncles subequal to the outer mini, inner rather 

 longer ; all parts sparsely spinous. The first pair extend beyond the second and these 

 beyond the third. 



Third uropods : Inner rami lanceolate, as long as the peduncle, and reaching to the 

 end of the first joint of the outer ; margins finely spinulose. 



Telsoii about as wide at the base as long, cleft about two-thirds of its length, 

 divisions dehiscent, rounded. 



Both specimens had the third and fourth peraeopods turned up over the back. 



ORCHOMENE GONIOPS.| (Plate 3, fig. 6.) 

 Orchomene goniops, A. 0. Walker, Ann. and Mag. Nat. Hist. XVII. (11)0(1), p. 455. 



W.Q., 21 Aug., 1903 ; two specimens, probably immature; length 5 mm. 



Body-segments increasing in length backwards. First four side-plates deeper than 

 the segments, narrow. Tliird pleon-segment with a small postero-dorsal carina and hind 

 and lower margins straight, the former crenate, the posterior angle rather less than 90. 



* Vidensk. Meddel. 1887 (1888), p. 67. 

 f yavla, angle ; &\jr, face. 



