251 



on each side, and having the frontal edge broadly rounded. The 3 anterior 

 segments of mesosome of nearly same size and shape, with the lateral parts slightly 

 expanded and curved anteriorly, each terminating in a blunt corner; 4th segment 

 considerably narrower, subquadrate in outline, and somewhat constricted in the 

 middle. Posterior section of mesosome exceeding the anterior in length, its 1st 

 segment much longer than any of the other segments, but rather narrow, with 

 the anterior corners rounded off. Caudal segment narrow oblong, without any 

 lateral notch, tip narrowly rounded. Inferior antennae comparatively short, not 

 attaining the length of the anterior division of the body, flagellum somewhat 

 exceeding half the length of the peduncle, and composed of 9 articulations. 1st 

 pair of legs rather strong, meral and carpal joints dilated, and each armed inside 

 with 3 strong spines, propodos narrow, sublinear, unarmed; 2nd pair still larger 

 and of a very similar structure, carpal joint armed inside with 4 strong spines, 

 meral one with only 2 such spines; the 2 succeeding pairs rapidly decreasing in 

 size, and likewise spinous inside. The 3 posterior pairs comparatively feeble and 

 imperfectly natatory, carpal joint but slightly dilated, and carrying inside only 2 

 or 3 slender spines. Uropoda scarcely attaining half the length of the caudal 

 segment, and of the structure characteristic of the genus. — Adult male somewhat 

 less slender than the female, and having the frontal part of the cephalon considerably 

 more produced, and distinctly insinuated at the tip. The 4 anterior segments of 

 mesosome each with the lateral parts produced to a short incurved spine. Posterior 

 section of mesosome comparatively broader than in the female, its 1st segment 

 nearly quadrate in outline, with the anterior corners tipped by a small denticle. 

 Caudal segment likewise broader than in female, and more evenly rounded at the 

 tip. Length of female about 2 mm., of male P/a mm. 



Remarks. -^This is a very distinct species, easily recognizable from any 

 of the other known species of the genus, both by the general form of the body 

 and by the structure of its several appendages. It has been provisionally named 

 by Dr. Hansen as above, and the specimens were kindly sent me for examination 

 and description. 



Occurrence. — The specimens were taken during the Danish Expedition in 

 the very same place (Stat. 460) where Macrostylis longiremis occurred, the depth 

 being 125 fathoms. 



