35 



outer one much the larger and having a distinct terminal joint. TVlsou lar-e. 

 tapering, and deeply cleft. 



Eemark*. This genus, though in some points related to the 



preceding one is very markedly distinguished by the rather dim-rent structure 

 of the anterior gnathopoda and of the maxillipeds, as also h v thai of the 

 last pair of uropoda and the telson. It was founded by the Rev. Mi-. Sl 

 on a species from the Challenger Expedition procured at 



3. Cheirimedon latimanus, U. o Sars. 



(PI. 13, fig. 2). 

 Normnnia latimctna, G. 0. Sars Ovorsigt af Norges Crustaoecr I, p. 83, pi. 3 fig. 3. 



Body highly compressed, with the Lack evenly rounded. (V]ilial.m 

 having the lateral corners somewhat projecting and angular. Segments of 

 mesosome successively increasing in size posteriorly. Ooxal plates verv huge. 

 the 4 anterior pairs being more than twice as deep as the body; f>th pair about 

 as deep as it is broad. Epimeral plates of metasome likewise rather large, last 

 pair having the posterior corners rectangular. First segment of urosome pro 

 duced dorsal ly to a high compressed projection, obliquely truncated at the tip. 

 Eyes of moderate size, narrow oval. Superior antennae about the length of 

 the cephalon and the 3 anterior segments of the mesosome combined, 1st 

 joint of the peduncle more than three times the length of the other 2 com- 

 bined, flagellum about the length of the peduncle, 7-articnlate with the 1st 

 joint rather large, accessory appendage slender, triarticulatc. Inferior antenna? 

 (in female) about the length of the superior, flagellum 6-articulate. Anterior 

 gnathopoda with the carpus very small, triangular, propodos exceedingly 

 large and broad, occupying about the third part of the length of the leg. 

 triangular, gradually expanded towards the extremity, palm without any 

 crennlations, slightly arcuate and denned below by a rightangled corner armed 

 with 2 slender spines. Last pair of uropoda with the basal part shorter than 

 the telson, inner ramus conically tapering and quite bare, outer one having 

 at the end of the basal joint on each side a short spine. Telson almost 

 twice as long as broad, gradually tapering and cleft beyond the middle, with 

 2 small dorsal denticles on each side and a single one at the tip of each 

 terminal lobe. Length of adult female (! mm-. 



Remarks. - - The present species was formerly referred by the author 

 to the genus Nonncnn'a. But a closer anatomical examination has shown it 

 to be in reality rather different, and evidently to belong to the genus 

 Cheirimedon, as characterised by the Kev. Mr. St ebbing. 



