160 

 12. Harpinia abyssi, (i. 0. Sars. 



(PI. 56, fig. 1), 



Harpinia abyssi, G. O. Sars, Crustacea & Pycnog. nov. etc. No. 19. 

 Syn: Harpinia carinata, G. O. Sars (male). 



Body of female rather robust with broadly vaulted back. Cephalon 

 scarcely exceeding in length the 3 anterior segments of mesosome combined, 

 hood evenly convex above and projecting but little beyond the peduncle of 

 the superior antennae. Coxal plates rather broad, with a great number of 

 marginal setae ; 1st pair considerably expanded distally ; 5th pair with the 

 posterior lobe rather deep and nearly transversely truncated at the tip. 

 Metasome provided dorsally with extremely small hairs, only visible by a 

 strong magnifier ; last pair of epimeral plates obtusely rounded at the lateral 

 corners, inferior edge setous. First segment of urosome with a hump-like 

 projection dorsally. Superior antennae with the 1st joint of the peduncle 

 very large, fully twice as long as the other 2 combined, and provided at the 

 end inferiorly with a group of 6 penicillate auditory bristles; flagellum com- 

 paratively short, scarcely exceeding half the length of the peduncle, and ((in- 

 posed of 7 articulations ; accessory appendage somewhat shorter, and (3-articu- 

 late. Inferior antennae scarcely as long as the superior, flagellum (3-articulate. 

 Penultimate joint in both pairs of antennae densely beset posteriorly with 

 strong plumose setae. (Tuathopoda of moderate size, not very unequal, hand 

 in both oblong oval with the palmar edge very oblique and considerably longer 

 than the hind margin, thumb-like projection nearly obsolete. Penultimate 

 pair of pereiopoda exceeding half the length of the body, propodal joint long 

 and slender; last pair very small, basal joint forming at the end anteriorly 

 a densely setous expansion, posterior edge rounded and provided, in the lower 

 part, with a number of very small crenulations. Last pair of uropoda not 

 very large, both rami tipped by a single seta, the inner much shorter than 

 the basal joint of the outer, the latter witli 6 spines exteriorly, its terminal 

 joint extremely small. Lobes of telson very short, rounded at the tip. 

 Adult male much more slender and compressed than the female, metasome and 

 urosome carinated dorsally, the carina forming on the 1st and 3rd segments 

 of urosome a rounded projecting lobe. Peduncle of both pairs of antennae 

 with dense brushes of sensory hairs, basal joint of the flagellum of the su- 

 perior ones, as usual, rather expanded and likewise densely hairy. Grnathopoda 

 somewhat more slender than in female, but otherwise of rather similar structure. 

 Basal joint of last pair of pereiopoda more evenly rounded, with the anterior 

 expansion obsolete, and the posterior edge nearly smooth. Last pair of uro- 

 poda with the rami somewhat expanded, the outer slightly longer than the 

 inner and provided on the outer edge with a series of G small hairs, terminal 



