Rev. A. M. Norman on new Crustacea AmpMpoda. 419 



three segments deep, their infero-posteal angles completely 

 rounded ofF. A marked line of separation between third 

 and fom-th segments ; fourth, fifth, and sixth segments almost 

 coalesced, the two latter actually so ; the dorsal margin ele- 

 vated into three little tuberculated humps, which mark the 

 three segments ; the sixth segment abruptly truncated behind, 

 the telson being attached to the lower edge of the truncation. 

 Telson squamiform, semielliptical, cleft almost to the base, 

 cleft linear. First uropods much longer than second, and as 

 long as the last (exclusive of their setae), last having a broad 

 peduncle and two widely lanceolate rami, which have their 

 margins furnished with long plumose setae. The structure of 

 the shell of this species consists of hexagonal cells, which are 

 extremely conspicuous and remarkably regular and elegant 

 on the coxge of the last pereiopods. Length scarcely a tenth 

 of an inch. 



This species has never been taken with the dredge : it is a 

 capital swimmer, and is procured by means of the surface-net. 



Shetland (A. M. N. and Mr. D. Robertson) ;, Moray Firth 

 (Mr. T. Edward) ; Firth of Clyde (Mr. D. Robertson). 



The characters which will enable this species to be recog- 

 nized at a glance are, first, the coalesced fifth and sixth seg- 

 ments of the pleon, and the remarkable posterior truncation of 

 the latter ; and, secondly, the form of the last pereiopods, and 

 especially their elegant hexagon-celled thighs. 



MiCEOPROTOPUS, Norman. 



Superior antennm furnished with a secondary appendage. 

 First gnathopods subchelate. Second gnathopods subchelate, 

 larger than the first, greatly developed in the male, but scarcely 

 larger than the first in the female. Uropods terminating in 

 simple spines, those of the last pair having only a single 

 ramus. Telson tubular. 



This genus is closely allied to Microdeuteropus. It differs 

 from that genus inasmuch as the second gnathopods are larger 

 than the first, the contrary being the case in Microdeuteropus — 

 and in the last pair of caudal appendages, which have only 

 one branch. 



Microprotopus maculatus^ Norman. PI. XXIII. figs. 7-11. 



Mici'oprotopus maculatus, Norman, Report British Association, 1866 

 (1867), Reports, p. 203. 



Male. — Eye small, round, crimson, situated on a projecting 

 lobe between the bases of the two pairs of antennae. Antennce 

 subequal in length ; the peduncle of the superior reaches a 

 little beyond the penultimate joint of the peduncle of the in- 



