182 DR WALTER M. TATTEKSALL ON 



nent pseudo-rostrum, as in Macromysis inermis, and it is possible that THOMSON may 

 have mistaken this structure for the true rostrum. On the other hand, the rostrum 

 may become more produced and spiniform with age, as it is known to do in certain 

 Euphausians, e.g. Thysanoessa macrura. The telson of the present specimen has three 

 lateral spines on each margin, anterior to the constriction characteristic of the telson 

 in this genus, and between the three small spines at the apex of the telson there are 

 finer and longer setaj. THOMSON does not mention or figure either of these features. 



o 



The inner uropods have seventeen spines on their inner margins, the spines com- 

 mencing at the statocyst and extending the whole way to the distal extremity of the 

 appendage, increasing in size. They are not arranged in series. There are five spines 

 on the outer margin of the proximal joint of the outer uropods. 



Sub-family MYSIN.*:. 

 Genus Antarctomysis, Coutiere. 



Antarctomysis, Coutiere, 1906. 

 Antarctomysis, Hausen, 19086. 

 Antarctomysis, Tattersall, 1908. 



Antarctomysis maxima, Hausen. 



My sis maxima, Holt and Tattersall, 100G. 

 Antarctomysis maxima, Coutiere, 1906. 

 A. maxima, Hausen, 1908^. 

 A. maxima, Tattersall, 1908. 



Scotia. 



Station 325, lat. 60 43' 42" S., long. 44 38' 33" W., Scotia Bay, South Orkneys. 

 One immature female, 30 mm. 



This species has a circumpolar distribution, having been captured by the Discovery, 

 the Uelgica, the Charcot Expedition, and now by the Scotia, at the four points of the 

 compass in the Antarctic Ocean. 



Order EUPHAUSIACEA. 

 Genus Thysanopoda, Milne- Ed w. 







Thysanopoda cornuta, Illig. 



T. cornuta, Illig, 1905. 

 T. insignis, Hansen, 19056. 

 T. cornuta, Hansen, 1912. 

 Scotia. 



Station 407, lat. 40 08' S., long. 1 50' E., 2645 fathoms, trawl. One 

 female, 79 mm. 



This magnificent specimen agrees well with both ILLIG'S and HANSEN'S descriptions. 

 It was captured at very nearly the same place as the type-specimen, in the Benguela 



(UOY. SOC. EL>IN. TRANS., VOL. XLIX., 87i!.) 



