kongl. sv. Vet. akademiens handlingar. band. 22. n:o 7. 21 



three times as long as the peduncle, uniarticulate; a few long auditory cilia at apex; a 

 single row of short hairs on the inferior surface. In the female the first pair of antennas 

 are of the same shape but much smaller, and the joints are more plainly visible. 



In the young animal the first pair of antenna? are short and stout, situated nearer 

 the superior margin of the head than in the adult; the first peduncular joint as long as the 

 three terminal ones; the second longer than the third, and their breadth less than that of 

 the first; the fourth joint smallj and either rounded or broadly triangular with rounded 

 apex; fiagellum minute, linear, uniarticulate, with one or two cilia crowning the apex, as ( 

 long as or longer than the fiagellum. 



The second pair of antennae rise from the inferior portion of the head, near the 

 buccal region; more than twice as long as the first pair; peduncle four-jointed; first and 

 second joints long; first about half the length of the second, extending to the anterior 

 margin of the head, but not exposed beyond it; second joint slender, cylindrical, and the 

 entire length of its upper border closely set with short equidistant hairs, curled at their 

 tips; third and fourth joints short, subequal, about one quarter the length of the second, 

 a few hairs on the upper surface; fiagellum linear-lanceolate, in length almost equal to 

 the second joint of the peduncle, uniarticulate, pointed, with seven or eight slight serrations 

 along the superior edge, one or more hairs at each serration. The second joint is directed 

 upward and outward, and the third, fourth, and fiagellum are bent downward, nearly at 

 a right angle with the second. When the animal is at rest the second pair of antenna? 

 are evidently folded up in this manner in the concavity in the front of the head. In the 

 female they are quite different, they do not extend at all, or very slightly, beyond the 

 anterior margin of the head. The first peduncular joint is very short, and broader than 

 the following; the second is long, and reaches nearly to the anterior margin of the head; 

 the third joint is rudimentary; and the fourth is apparently obsolete. The fiagellum is 

 small, about one-third the length of the first joint, lanceolate in shape, and with two or 

 three stout cilia at its apex. The shortening is chiefly due to the diminished length of 

 the first joint of the peduncle. 



In the young animal this pair are represented by a small rounded tubercle, tipped 

 by a cilium; situated just beneath the first pair. 



The depth of the peroeon decreases slightly posteriorly. In the female the peraeon 

 is shorter and deeper, and the last segment is much narrower. 



The first pair of perceopoda are shorter and more robust than the second; the tibia 

 is produced postero-inferiorly l ), at its extremity a number of stiff hairs, slightly curled 

 at their tips. The carpus is broad, dilated posteriorly, but not produced inferiority, with 

 its inferior edge straight, and armed at the posterior angle with two stout spines or bristles. 

 The metacarpus is shorter than the carpus, and about one-half as broad. The dactylus 

 is very minute. 



The second pair have none of the joints dilated. The tibia is short, about one 

 fourth the length of the carpus. The carpus is slender and cylindrical. The metacarpus 



*) The wording of his description is: »antero-inferiorly» but he evidently means that the lower hinder 

 corner is produced. 



