KONGL. SV. VET. AKADEMIENS HANDMNGAIi. I5AN1I. 22. N:() 7. 379 



A coinparisoii of tlic descriptions and di-awiiigs given by Gii.Ks and CnfN -with the 

 foUowing description will prove that the ncw sjjccific names Phroniina biir(;j)lndn and /V/. 

 Dm/enes aro only synonyms for Ph. Colkttti, which was proposed by me in 1887. 



Phronima CoUetti is n)ost closely allied tu Ph. padjica, Streets, but is easily 

 distinguished by the length of the third and fourth pairs of penvopoda, and by tlie imier 

 ramus of the second pair of uropoda being longer than the outer. 



The female. 



Pl. XVI, fig. 44—47, 



The body is comparatively more robust tlian in Phronivia sedentaria; tlie head and 

 pera^on together are much longer than the pleon and urus together. 



The head is tolerably long, not fully twice as deep as long. The front side is 

 feebly convex, without antennal groove. 



The eyes are closely like those in the preceding species. 



The first pair of antennce (Pl. XVI, fig. 45) are fixed below the middle of the front 

 side of the head. The single peduncular joint is a little longer than broad. The single 

 flagellar joint is almost cylindrical, rounded at the apex, and provided with long olfactory 

 hairs; it is more than twice as long as the peduncle. 



The moutk-organs are exactly like those in the male. 



The ■perceon. The first two segments are abruptly much deeper than the third. 

 The third segment is much shorter than the two pi'eceding together. The seventh segment 

 is thicker than in the preceding species, and is somewhat longer than the fifth and sixth 

 together. 



The first 2)air of j^erasopoda reach far beyond the lower end of the head. The 

 fem ur is a little longer than the three following joints together. The tibia is only a 

 little produced at the lower hind corner. The carpal process is not half as long as the 

 metacarpus. The metacarpus is longer than the steni of the carpus; is tolerably thick 

 at the base, and tapers gently towards the apex. The dactyloptera are elongated, 

 somewhat more than half as long as the dactylus, and are finely pectinated along the 

 hind margin. The dactylus is long, almost a thii'd part as long as the metacarpus. 



The second pair (Pl. XVI, fig. 46) reacli a little beyond the apex of the tibia in 

 the third pair. The fem ur is a little dilated, with the hind margin convex; it is longer 

 than the three following joints together. The tibial process reaches hardly to a fourth 

 part of the carpus. The carpal process is about a fourtli |)art as long as the metacarpus. 

 The metacarpus is somewhat longer than the stem of the carpus. The dactylus is 

 long, nearly a fourth part as long as the metacarpus. 



The third and fourth pairs are longer than the head and the whole perseon. The 

 fe ra ur is much shorter than the three following joints together. The ge nu is longer 

 than broad. The tibia is almost twice as long as the genu. The carpus is longer than 

 the tibia, but shorter than the tibia and genu together. The metacarpus is as long 

 as the carpus. The dactylus is minute. 



