KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 9 



of uropoda is a little shorter than the rami; the peduncle of the second pair is much 

 shorter than half the rami, the interior ramus is ovate; the peduncle of the last pair is twice 

 as long as the rami. The telson is semicircular, shorter than the last ural segment, scarcely 

 as long as a fifth of the length of the peduncle of the last pair of uropoda. 



Colour. Light green. 



Length. 9 mm. 



Hal). South Pacific. Only one specimen is known, captured during the circumnavigation of H. 

 Swed. M:ty's Frigate Eugenie 1851—1853. (S. M.). 



Syn. 1887. (Jyllopus levis, C. BOVALLIUS. "Systematical list of the Amphipoda Hyperiidea». Bill. t. K. Sv. 



Vet. Akad. Handl. Bd. 11. N:o 16, p. 12. 



Cyllopus levis is to be distinguished from the other species by the large femur 

 of the seventh pair of pereiopoda, the rectangular hinder corners of the first two pleonal 

 segments, and by the ovate interior ramus of the second pair of uropoda. Only the male 

 is known. 



The head is almost globular, only a little longer than the first two pereional seg- 

 ments (8:7). 



The eyes occupy the whole surface of the head. 



The first pair of antennae (PI. I, fig. 37) are scarcely longer than the head and 

 the first pereional segment together. The first joint of the peduncle is longer than the 

 two following. The first joint of the flagellum is thick and tumid at the base, suddenly 

 narrowed a little before the middle; the terminal part is almost cylindrical, about as long- 

 as the basal tumid part of the joint together with the whole peduncle. No minute articuli 

 are to be seen at the apex of the flagellar joint. 



The second pair of antennae are six-jointed, the fourth joint is the longest, narrow, 

 linear, longer than the three preceding together, and equalling the length of the two last 

 ones. The joints are all fringed with minute, equidistant hairs along the upper and the 

 inferior margins. 



The first pair of pereiopoda (PL I, fig. 38) are as long as the second pair. The 

 femur is tolerably broad, the anterior margin curved, the posterior straight. The tibia 

 is a little produced at the lower, posterior corner. The carpus and metacarpus are 

 equal in length, both smooth. The dactylus is feebly serrated along the posterior margin, 

 half as long as the metacarpus. 



The second pair (PI. I, fig. 39) have, the femur narrower, almost linear. The carpus 

 is produced at the lower posterior corner forming a short spoonshaped process, not serrated 

 but fringed with long stiff hairs, and reaching to a third of the length of the metacarpus. 

 The carpus is considerably shorter than the metacarpus. The metacarpus is smooth. 

 The dactylus is finely serrated along the posterior margin, shorter than a third of the 

 metacarpus. 



The third and fourth pairs are equal in length; the metacarpus is not serrated, 

 as long as the carpus. 



K. Sv. Vet. Akad. Handl. Baud. 22. N:o 7. • ^ 



