Schiiopoda cvUtctfcl in the Anlarclic liejiuu. 11 



of the total Iciigtli of the uropod. Outer uropods about half 

 as \ony; a<<aiu as the inner. 



Leyigth 25 mm. 



LociiUty. Four specimens from holes in the ice at winter- 

 quarters. One from 100 fathoms, off Coalman. 



Mysis maxima, Hansen (MS.). 



The ' Discovery' collection contains two Mysids, taken at 

 lat. 78° 25' 40'' S., long. 1G5" 39' 6" E., of which the 

 largest is an immature male measuring 40 mm. In general 

 these individuals agree, except in size, rather closely with the 

 northern Mtjsis nu.rta, lately tiansfcri'cd by Norman (l'J02) 

 to the new genus Mic/it/ieimi/sis. The pleopods of the 

 male, however, though imperfectly developed, present a sharp 

 distinction, in that the last pair are biramous ; but do not as 

 yet ofi'er evidence of distinction in the adult from Hemimysis 

 while the mouth-parts difl'er in no important respect from 

 those of JMysis, sensu stricto, and its immediate allies. 



On visiting Dr. Hansen one of us found that he had already 

 diagnosed the specific characters of this form, of which he 

 ])Ossesses an abundant material, and some specimens which 

 he was kind enough to lend us show that the adult is distinct 

 from any of the genera recognized by Norman. 



As we cannot from ' Discovery ' material give an adequate 

 account of the species in the adult form nor assign it to a 

 properly diagnosed genus, we leave these tasks in the very 

 capable hands of ?Iansen. 



List uf Authorities quoted. 



CzKRNiAVSKY, 1883. — ' Monographia Mysidarum Imperii Rossici ' 



Fasc. 3. 

 Dana, 1852. — U.S.A. Exploriiifr Exped., xiv. Cru.stacea. 

 Hansen, 1887. — " Malacostraca marina Groenlaudife occidentalis," A'id. 



Medd. Naturli. Foren. KjiJb. 

 Hansen, 190o. — "Preliminary Report on the Schizopoda of the 'Prin- 

 cess Alice ' for 1904," Bull. Mus. Ocean. Monaco, no. 30. 

 HoDOSox, 1002. — Report Biol. Collect, of the 'Southern Cross.' 



London. 

 IIoLT and Tattersalt,, 190o.— Report of the Sea and Inland Fisheries 



Ireland, 1902-3: Pt. II. Scientific Investigations, Appendix no. iv. 

 Norman, KI02.— " Notes on the Natural History of East Finmark " 



Ann. & Mag-. Nat. Hist. ser. 7, vol. x. 

 Ohlin, 1901. — "Arctic Crustacea," Bihang Kongl. Sven. Act.- Vknd 



llandl., Bd. 27, Af.l. iv. 

 Bars, 188-5. — Voyage II. M.S. 'Challenger.' Report on Schizopoda. 



Zool. vol. xiii. 

 Stebiuno, ]H93. — History of Crustacea. Schizopoda, pp. 2.'36-278. 

 Steiidixg, 1900. — "Crustacea from the Falkland IsUuids," Proc. Zool. 



Soc, London. 



