KONGL. SV. VET.. AKADEM1ENS HANDLINGAB. BAND. 22. N:0 7. 369 



is very narrow, and almost linear, being eight times as long as broad. The rami are 

 equal in length, and serrated as in the first pair. The third pair have the peduncle about 

 nine times as long as broad, and three times as long as the inner ramus. The rami are 

 nearly equal in length, and are serrated as in the first pair. 



The telson is broadly rounded, nearly as long as broad, and not half as broad as 

 the hind part of the last ural segment. 



The male. 



The hotly is somewhat more robust than in the female, with the person less narrowed 

 behind. 



The head is more than twice as deep as long, and is shorter than the first four 

 pergonal segments together. 



The first- pair of antenna? are inserted considerabty below the middle of the front 

 side of the head. The first joint of the peduncle is about twice as long as the two 

 following joints together. The first joint of the flagellum is tumid, spindle-shaped, thickly 

 covered with olfactory hairs, and more than three times as long as the whole peduncle. 

 The following joints are short, cylindrical, six or seven in number, and together less 

 than half as long as the first flagellar joint. 



The second pair of antennae are about a third part longer than the first. The 

 peduncle shows three free joints; the first is as long as broad, the second a little longer, 

 the third still longer. The first joint of the flagellum is more than twice as long as the 

 last joint of the peduncle, and is sparingly set with minute hairs along the under margin; 

 the following joints are cylindrical, subequal in length, and each about half as long as the 

 first joint. The flagellar joints are eight or ten in number. 



The perceon is more compressed than in the female; the third segment is quite as 

 long as the first and second together; the seventh segment is longer than the fifth and 

 sixth together. 



The first four pairs of perceopoda are like those pairs in the female. 



The fifth pair have the carpus a little broader than in the female, but still nearly 

 twice as long as broad; the carpal process is not half as long as the stem of the joint, 

 and not twice as long as the tubercle on the under margin of the carpus; the tubercle 

 is small, tolerably sharp-pointed, and without crenulation. The metacarpus is nearly as 

 long as the stem of the carpus; the tubercle at the middle of the front margin is small 

 and smooth. The dactyl us is distinct in the younger males, but ju the larger ones it 

 is obsolete and the apex of the metacarpus is obtusely rounded as in the female. 



The sixth and seventh pairs are like those in the female. 



The pleon is as long as the five last perseonal segments together; the first pleonal 

 segment is somewhat longer than the last pergonal. The lower hind corner of the pleonal 

 segments is projecting and sharp-pointed. 



The pleopoda have the peduncle elongate-ovate. 



The urus and its appendages are like those organs in the female. 



K. St. Vet. Ak. Handl. Baad. 22. N:o 



47 



