244 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^. 



Hyperiella antarctica. 



are still longer, equal in length, cylindrical, and about nine times as long as broad. The 

 flagellar joints are in all ten in number. 



The second pair of antenna? (PI. XI, fig. 43) are a little longer than the first, but 

 do not reach fully to the hind margin of the fifth peraeonal segment. The first free joint 

 of the peduncle is as long as the second; the glandular cone is small; the third joint is 

 quite as long as the two preceding together. The first flagellar joint is longer than the 

 last peduncular joint; the following are shorter, equal in length, cylindrical, and about ten 

 times as long as broad. The flagellar joints are nine in number. 



The labrum is nearly as long as broad, and feebly bilobed. 



The mandibles. The edge of the incisive lamina is armed with eight equal teeth, 

 the secondary lamina of the left mandible shows four teeth. The molar tubercle is large, 

 the grinding surface being closely set with small, rounded tubercles, like pebbles, and 

 surrounded by a marginal row of broad unequal teeth. The palp is slender; the first joint 

 is about half as long as the second, the second and third are equal in length. 



The first pair of maxilla?. The principal lamina is closely set with hairs and armed 

 at the apex with four stout spines. The secondary lamina is tolerably broad; the lower 

 margin is serrated, and armed with a tooth-like spine at the inner corner. 



The second pair of maxillce. Both laminae are hirsute; the secondary lamina is 

 longer than the principal, and is armed at the apex with two stout spines. 



The maxillipeds. The median lobe is comparatively shorter than in Hyperia and 

 Euthemisto. The lateral laminae are serrated along the inner margins, and provided with 

 some long bristles at the base. 



The perazon. The segments are somewhat convex, the first is the shortest, and the 

 seventh the longest. The first two segments are a little deeper than the following; the 

 peraeon is broadest at the anterior end, but not fully as broad as the hind part of the head. 



The epimerals are fully as long as the under margins of the corresponding seg- 

 ments; they are rounded below. 



The branchial sacks are attached to the second and four following pairs of peraeo- 

 poda; they are somewhat shorter than the femora of the corresponding pairs. 



The first pair of perceopoda (PI. XI, fig. 44 and 45). The femur is almost linear, about 

 three times as long as broad, and a little shorter than the four following joints together; 

 it is provided with three bristles at the lower hind corner. The genu is as long as broad, 

 with five or six bristles at the lower hind corner. The tibia is tolerably broad, and 

 longer than the genu; the lower hind corner is produced, and the margins are fringed 

 with ten or twelve long bristles. The carpus is a little produced and much dilated, fully 

 as broad at the lower end as it is long; the front margin is almost straight, and provided 

 with three long bristles at the apex; the hind margin is irregularly convex, and armed 

 with four bristles; the under side is hollowed, but not as broadly as in Hyperia, showing 

 a right and a left margin, fringed with long bristles, at the junction of the two margins, 

 or the apex of the very short carpal process, there are three bristles. The metacarpus 

 is longer than the carpus, and twice as long as broad; the front margin is convex, and 

 set with four bristles; the hind margin is almost straight, and serrated, with three-pointed 

 teeth; on the outer side of the joint there are some long bristles. The dactylus is 



