422 



Distribution. Shetland Isles (Sp. Bate); Firth of Clyde (Robertson); 

 coast of France (Chevreux); Adriatic (Heller). 



5. Eusirus leptocarpus, Gr. 0. Sars, n. sp. 



(PI. 148, fig. 2). 



Body somewhat resembling in form that in the last species, but 

 having the posterior part of the back distinctly carinated, the carina being 

 produced in each of the segments of metasome, the last included, to acute 

 posteriorly pointing projections. Cephalon scarcely attaining the length of 

 the first 2 segments of mesosome combined, lateral corners truncated at the 

 tip. First pair of coxal plates rather expanded, and broader than they are 

 deep, anterior corner narrowly rounded, posterior one unarmed ; the 2 

 succeeding pairs likewise rather broad in proportion to their depth; 4th pair 

 having the edge, below the posterior projection, angularly bent. Last pair of 

 epimeral plates of metasome with the posterior edge but slightly curved and 

 finely serrated throughout, the serrations being also continued for some 

 distance on the inferior edge. Eyes but very faintly traced in alcoholic 

 specimens, though apparently of the usual shape. Superior antennae but little 

 exceeding l /s of the length of the body, 1st joint of the peduncle about the 

 length of the 2nd, both being rather elongated, flagellum considerably shorter 

 than the peduncle, and without any calceolse, accessory appendage very narrow, 

 and fully as long as the last peduncular joint. Inferior antennae not much 

 shorter than the superior, last joint of the peduncle scarcely attaining the 

 length of the penultimate one, flagellum about half as long as the peduncle, 

 and without any calceolae. Gnathopoda comparatively large, with the carpus 

 much elongated and greatly attenuated in its outer part, propodos extremely 

 broad, the breadth being fully twice the length, palm evenly curved, dactylus 

 very narrow and elongated. Pereiopoda rather slender, meral joint of the 2 

 anterior pairs somewhat longer than the propodal joint, basal joint of the 3 

 posterior pairs comparatively narrow, and finely serrated on the posterior 

 edge. Last pair of uropoda with the rami subequal and narrowly lanceolate 

 in form. Telson comparatively larger than in E. longipes, but otherwise of 

 a very similar structure. Colour in the living state of the animal not yet 

 stated. Length of adult female 8 mm. 



Remarks This new species somewhat resembles E. longipes, as to 

 its general appearance, yet, on a closer examination, is easily distinguish- 

 able, not only by its greatly inferior size, but also by several well-marked 

 structural details, for instance, by the presence of a distinct dorsal projection of 



