413 



rostral projection reaching nearly to the middle of the basal joint of the 

 superior antennae, lateral corners somewhat produced, and narrowly rounded 

 at the tip. First pair of coxal plates having the anterior corner acutely 

 produced; the 3 succeeding pairs obliquely rounded at the tip, and but little 

 different in size; 5th pair more than twice as broad as they are deep, and 

 having the anterior lobe scarcely expanded below. Last pair of epimeral 

 plates of metasome nearly rectangular. Eyes wholly absent, not even the 

 slightest trace of any replacing pigment being visible in the living animal. 

 Superior antenna in female but little exceeding in length 1 /s of the body, 

 1st joint of the peduncle nearly twice as long as the other 2 combined, 

 flagellum scarcely 3 times as long as the peduncle, and having the 1st joint 

 as long as the 8 succeeding ones combined, accessory appendage rather slender 

 and nearly as long as the peduncle, triarticulate, with the 1st articulation 

 twice the length of the other 2 combined. Inferior antennas but little longer 

 than the superior, last joint of the peduncle shorter than the penultimate 

 one, flagellum about the length of the peduncle. Both pairs of antennae in 

 male much more strongly built than in female and nearly twice as long, the 

 superior ones having the 1st joint of the flagellum extremely large and densely 

 clothed with sensory hairs, accessory appendage about the same length as 

 the latter, and having its 1st joint pronouncedly laminar. Gnathopoda with 

 the carpus scarcely at all expanded below, but densely setous, especially on 

 the posterior ones, propodos much longer than the carpus, and rather narrow, 

 with the palmar edge densely setous, dactylus of moderate length, and quite 

 simple. The 2 anterior pairs of pereiopoda scarcely longer than the gnatho- 

 poda, and having the meral joint a little shorter than the carpal one. The 

 3 posterior pairs rather slender and elongated, basal joint of the antepenulti- 

 mate pair comparatively small and narrow, that of the 2 succeeding pairs 

 successively larger, meral joint considerably longer than the carpal one, 

 propodal joint about the length of the latter, dactylus rather short. Last 

 pair of uropoda with the outer ramus somewhat longer than the inner, terminal 

 joint small, spiniform. Telsou rather narrow and elongated, more than twice 

 as long as it is broad at the base, and gradually tapering tlistally, cleft very 

 narrow, and extending nearly to the base, terminal lobes bidentate at the tip. 

 Body pellucid, with a faint yellowish tinge. Length of adult female 8 mm., 

 of male 9 mm. 



Remarks. There cannot in my opinion be any doubt that the form 

 described by Boeck as Halice grandicornis is the adult male of H. dbyssi, and 

 therefore ought to be cancelled as a separate species. The sexual difference 

 is certainly, in this form, very prominent, but in all essential points it 

 corresponds pretty well with that observed in the other Partial iscida. From 



53 Crustacea. 



