74 



Anisomysis n. gen. 



Description (based on the male). — Body somewhat slender. Carapace produced into 

 a moderately large frontal plate (PI. XII, fig. i a), posteriorly not covering the entire cephalo- 

 thorax. Eyes very large; their stalks of very moderate length. Antennular peduncle with the 

 male lobe large, somewhat longer than broad; the distal inner margin of this lobe strongly 

 concave, and the terminal part almost three times narrower than the proximal and feebly 

 curved (fig. i ó). Antennal squama (fig. i c) narrow, lanceolate, with setae along both margins 

 and distally with a transverse suture. Labrum obtuse in front, without process. Left mandible 

 (figs. ld and ie) with a thick, movable lobe, two extremely broad, curved and distally digitate 

 setae, and the molar process well developed; palp somewhat slender. Maxillse normal, but the 

 palp narrow, with its distal joint almost two and a half times as long as broad, increasing a 

 little in breadth from the base to slightly beyond the middle. Maxillipeds (fig. i ƒ) broad, with 

 many setae along the inner side; second joint with a small lobe, the following joint without 

 any lobe; claw very long. Gnathopods (fig. ig) with second joint very broad, the other joints 

 slender and the claw very long and slender; the number of setae on the endopod proportionately 

 small; exopod with the subbasal joint very broad. First pair of thoracic legs (fig. ik) with 

 second joint very broad and the other joints on the whole slender-, sixth joint divided into two 

 subjoints; seventh joint well developed, moderately slender; claw very long, slender; exopod 

 with second joint very broad. (The other pairs of thoracic legs lost). 



Male pleopods of first, second, third and fifth pairs are small plates (figs. i /-, i /, i m, 

 \p, \q)\ fourth pair (figs. \i and \ n) with the one-jointed endopod minute and the exopod 

 very long, three-jointed and terminating in two short branches (fig. 1 o). Uropods (fig. i r) 

 somewhat slender; exopod considerably longer than the endopod; both without spines but with 

 setos along both margins; otocyst well developed. Telson (fig. ir) half as long as the uropods, 

 very broad and even posteriorly very broad with a broad, moderately deep incision and the 

 lobes turned obliquely outwards with the result, that the distal two-thirds of each lateral margin 

 are considerably concave. 



Remarks. — This genus is on the whole allied to Mysis sens. Sars 1877, but it 

 differs strongly from all forms of the tribe Mysini by the shape of the telson and by having 

 four pairs of the male pleopods plate-shaped ; finally the maxillary palp and the gnathopods 

 are unusually slender. 



43. Anisomysis laticauda n. sp. PI. XII, figs. ia — is. 



Stat. 142. August 5/7. Anchorage off Laiwui, coast of Obi Major. 23 m. HENSEN vertical net 

 with electric light. 1 adult male. 



Description. — Frontal plate (fig. ia) somewhat broad, more than twice as long as 

 broad, with the front end moderately broadly rounded. Eyes very large, dark brown ; last joint 

 of the eye-stalks increasing much in breadth from the base to the eye and somewhat less than 

 twice as long as broad. Antennal squama reaching a little beyond the end of the antennular 



