MYSIDACEA— TATTERSALL. 285 



specimens are considerably mutilated, and nearly all the setae on the appendages are 

 missing. The pleopods of tlie male do not appear to be any longer than those 

 described by Hansen in this species. 



Distribution. — Circumpolar, having been taken by the " Discovery " and the 

 " Belgica," and by the Swedish and German Antarctic Expeditions. The longitude 

 given for this species in my " Discovery " report is incorrect, and 185° E. should 

 read 165° E. 



Genus AMBLYOPS, G. 0. Sars. 



9. Amblyops tattersalU, Zimmer. (PL I, figs. 3-4.) 



A. tattersalU, Zimmer, 1914, p. 390, taf. XXIII, figs. 13-16. 



Occurrence. — Antarctic, Station 355, one female, broken, ca. 30 mm. 



Remarks. — The single specimen available is somewhat fragmentary, but agrees 

 substantially with Zimmer's description and figures. The eyes are microscopically 

 spinulose, especially on the outer distal corner. The papiUiform process on the eye 

 is rather stouter than shown by Zimmer, and in lateral view is somewhat curved and 

 acute. A central mass of nerve cells is clearly seen at the base of the process. The 

 outer spine of the antennal scale bears three subsidiary spines, not teeth. There are 

 twenty-four spines on the telson. 



Distribution. — Known only from two specimens obtained at the winter quarters 

 of the German Antarctic Expedition in 66° 2' S., 89° 38' E., 385 metres. 



Tribe LEPTOMYSINI. 



Genus PEOMYSIS, Dana, 1850. 

 = Uromysis, Hansen, 1910. 



The genus Promysis was established in 1850 by Dana for a mysid captured in 

 the China Sea, 450 miles N.E. of Singapore. The genus with its type and only 

 species, P. orientalis, Dana, has since remained obscure. Hansen (1910), however, 

 has described a mysid under the name Uromysis armata, which, it seems to me, 

 must clearly be referred to Dana's genus. The form of the telson and the peculiar 

 natm'e of the armature of the inner uropod, as shown in Dana's figures, agree essen- 

 tially with the same parts as figured by Hansen, while the form of the antennal scale 

 is likewise the same in both species. Uromysis, Hansen, must, in my opinion, be 

 cancelled as a synonym of Promysis. It is extremely probable that Promysis 

 orientalis and P. armata are synonyms, but there are discrepancies in the published 

 descriptions and figures, which, without an examination of the type specimens of 

 both, cannot be ignored, and it is best, at present, to regard each species as valid. 

 P. orientalis differs from P. armata, as far as can be seen, in the following points — 

 (1) it is double the size, (2) the antennal scale appears to be nmch longer, (3) the 

 details of the arrangement of the spines on the telson are different, e.g. the most 

 distal spine on the lateral margin is situated some distance from the apex, whereas 



