KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 271 



Colour. Light red, witli the ocular pigment dark red. 

 Length. 5—6 mm. 

 Hab. The Southern temperate region of the Atlantic, Lat. 41° S., Long. 57° W. (S. M.) 



Parathemisto Goesi comes in general form of body nearer to the genus Hyperia 

 than its congeners do. In fact the species is an intennediate form between Parathe- 

 misto and Hyperia, resembling the former in the shape of the antenrife and of the pe- 

 rfBopoda, and the latter in the form of body and of the urus with its appendages. 



The fem a le. 



Pl. XII, fig. 1—10. 



The body is HyperiaAike, only a little more corapressed; the integuraent is very 

 thin, and almost pellucid. The head and perason together are quite as long as the pleon 

 and urus together. 



The head is fully as long as the first three personal segments together, and is 

 more than a third part deeper than it is broad. The antennal groove commences above 

 the middle of the front side, and is long and narrow. 



The first j^air of antennce (Pl. XII, tig. 2) are not longer than the head; the iirst 

 joint of the peduncle is only a little longer than the two following which are coalesced. 

 The singie flagellar joint is longer than the whole peduncle, is thick, and tapers slowly 

 towards the apex, not showing such a long, cylindrical, terminal part, as does that joint 

 in the females of the other species of Parathemisto; the under side of the flagellura is 

 set with long olfactory hairs. 



The second pair of antennce (Pl. XII, fig. 3) are longer than the first, and nearly 

 as long as the head and the first perasonal segment together. The first free joint of the 

 peduncle is scarcely half as long as the coalesced second and third; the singie flagellar 

 joint is longer than the whole peduncle, gently tapering towards the apex, and is set with 

 short fine hairs on the under margin. 



The first pair of perceopoda (Pl. XII, fig. 4) are only a little shorter than the 

 second. The femur is elongate-ovate, and it scarcely longer than the three following 

 joints together. The genu is broader than long, and has a singie bi'istle at the lower 

 hind corner. The tibia is longer than the genu; the under truncated margin is fringed 

 with a few bristles. The carpus is not very broad; the front margin is smooth, the hind 

 fringed with four or five long bristles. The metacarpus is longer than the carpus; the 

 convex front margin is smooth; the hind margin is straight, not serrated, and provided 

 with a singie bristle. The dactylus is quite half as long as the metacarpus ; it is curved, 

 and finely serrated on the hind margin. 



The second pair (Pl. XII, fig. 5) reach to the apex of the carpus of the third pair. 

 The femur is somewhat shorter than the four following joints together. The genu is 



