KONGL. SV. VET. AKADEMIENS IIANDLINGAK. BAND. 21. N:o 5. 41 



The head is very short, flattened anteriorly, five times deeper than long, and shorter 

 than half the first pereional segment. Below the middle the anterior margin on each 

 side projects into a broadly rounded lobe, at the upper corner of which the eye is 

 situated. The upper anterior corner of the head is obtusely rounded without any trace 

 of a rostrum. 



The eyes are elongated vertically, very small, placed at the base of the first pair of 

 antenna?; they consist each of about fifteen ocelli. 



The first pair of antennae (PL VI, fig. 15) are somewhat like those organs in the 

 female of Hyperia; the first joint of the flagellum is thick, tapering towards the end, fringed 

 with thick olfactory hairs or glands; it is twice as long as the peduncle; the following 

 joints are three in number, the last is the longest and narrowest. The antennae are twice 

 as long as the head and the first pereional segment together. 



The second pair of antenna; (PL VI, fig. 16) are short and robust; they reach to 

 half the length of the second pereional segment. The second joint is longer than the 

 third, and three times as long as the first; they are fringed with short hairs along the 

 upper margins. The first joint of the flagellum is a little longer than the whole peduncle 

 (9:8) and shaped as the blade of a dagger; it is fringed with short hairs along the upper 

 margin and provided with comparatively large terminal joints, the last of which is the 

 longest and tipped with two long hairs. 



The pereion; the first segment is shorter than the seventh (3:5), and scarcely equals 

 in length a fifth of the third segment, Avhich is the longest. The anterior parts of 

 the third and fourth segments are turgid or raised, forming a kind of round wall along 

 the anterior margins. Such walls, though much smaller, are also to be seen at the anterior 

 margins of the second, fifth, and sixth segments. The last three pereional segments are 

 a little longer than the fourth (19:17). All the legs are thick and robust. 



The epimerals are long but not very deep, irregularly rounded below. 



The branchial sacks are comparatively small. 



The ovitectrices were not much developed in the specimen examined, naked; they are 

 fixed beneath the branchial sacks. 



The first pair of pereiopoda (PL VI, fig. 17); the carpus is broad, triangular, a little 

 longer than broad; the lower margin is straight. The metacarpus is much shorter than 

 the lower margin of the carpus, a little longer than broad at the base (6:5), provided 

 with some few long hairs along the margins. The dactylus is almost straight, longer than 

 half the metacarpus. 



The second pair; the carpus is very thick, longer and broader than the metacarpus; 

 the metacarpus is of the same form as in the first pair, but longer; the dactylus is small, 

 shorter than a third of the metacarpus. 



The third and fourth pah \\ are equal, the longest of all; the femur is elongate-ovate; 

 the tibia rather shorter than the carpus; the metacarpus a little longer than the carpus; 

 all joints smooth without hairs or serrations. 



The fifth pair (PL VI, fig. 18 and 19) are shorter than the fourth (7:8), the tibia 

 is as long as the carpus, the metacarpus a little longer; the dactylus is quite smooth. 



K. Sv. Vet. Akad. Handl. Band. 21. N:o 5. " 



