66 



Gen 15. Orchomenella, G. 0. Sars, n. 

 Syn: Orchomene, Boeck (ex parte). 



Body more or less plumpy, with large coxal plates. Last pair of 

 epimeral plates of metasome scarcely serrated posteriorly, infero-lateral corners 

 blunt or slightly produced. Superior antennae about as in Orchomene', inferior 

 ones, as a rule, more slender and elongated than the superior, in male scarcely 

 as long as the body. Epistome less projecting than in that genus, and evenly 

 rounded or flattened in front. Mandibles of somewhat coarser structure than 

 in Orchomene, molar expansion comparatively larger and blunted at the ti^>, 

 palp slender and not originating so near the base as in the latter genus. 

 First pair of maxillae with the masticatory lobe very obliquely truncated at 

 the tip, spines partly lamellar and finely denticulated at one of their edges, 

 basal lobe and palp about as in Orchomene. Second pair of maxillae with the 

 lobes less elongated. Maxillipeds with the masticatory lobe comparatively smaller 

 and oblong in form, but the palp, on the other hand, larger. Anterior gnatho- 

 poda rather strong, subcheliform, posterior ones less slender than in Orchomene; 

 propodos short, dilated distally and densely hirsute, apex slightly produced 

 beneath the minute dactylus. Pereiopoda comparatively short, basal joint of 

 the 3 posterior pairs large and laminar. Last pair of uropoda in female 

 about as in Orchomene, in male but slightly modified, outer ramus only 

 setiferous. Telson larger than in that genus, reaching beyond the basal part 

 of the last pair of uropoda, form oblong triangular, cleft very narrow fissure-like. 



Remarks. - I have seen fit to establish this new genus, in order to 

 include some small species formerly referred partly to the genus Orchomene, 

 partly to that of Anonijx and Tryphosa, but agreeng pretty well with each 

 other in certain structural details, so as to form a natural group, which 

 undoubtedly has its nearest ally in the genus Orchomene. Besides the 4 

 species described below, the form recorded by the Hev. Mr. Stebbing from the 

 Challenger Expedition as Trt/phosa barbatipes may perhaps more properly be 

 referred to the present genus. 



23. Orchomenella minuta, (Kroyer). 



(PI. 24, fig. 1). 

 Anonyx minutus, Kroyer, Nat. Tidsskr. 2 R. Bd. 2, p. 23. 



Body short and thick, with broadly vaulted back. Lateral corners of 

 cephalon slightly produced, in female almost right-angled, in male rather 

 narrow and acute at the tip. Coxal plates very large, the 4 anterior pairs 

 more than twice as deep as the body, 1st pair scarcely expanding below, 5th 



