0246 CARL BOVALLIUS, ARCTIC AND ANTAROTIO HY PERID.S. 
thus be included within the limits of the arctic region, but 
this seems to do but little harm, as is shown by the diagram 
of the geographical distribution of the species given below. 
The notices about arctic and antarctic Hyperids are very 
scarce in the rich literature concerning the amphipodous 
Crustacea. The first Hyperid mentioned from the arctic re- 
gion is H. Strom's! »Pulex cancrifornus antennis brevissimis> 
from the western coast of Norway (1762); some years later 
(1776) it was named Gammarus medusarum by O. F. Mäller? 
(= Hyperia medusarum OO. F. Mäller, p. 560). . Subsequent 
authors have until very lately confounded it with allied spe- 
cies as will be seen by the synonomical list pag. 560, and it 
appears in the literature under different names as Talitrus 
Cyanee Sabine?, Hyperia spinipes A. Boeck, a. o. The next 
Hyperid mentioned is one of the most characteristic of the 
arctic region, HFuthemisto libellula, observed and described by 
M. W. Mandt? (1822) from the west coast of Greenland under 
the name of Gammarus libellula. The first truly zoo-geographical 
contribution including the tribe in question was given in the 
year 1838 by Henrik Kröyer. He enumerated the following 
species of Hyperids from the seas off Greenland: 
Metoecus medusarum Kr. (= Hyperoche Kroeyeri p. 5364). 
Themisto arctica Kr. (= Euthemisto Uibellula 9 p. 569). 
Themisto crassicormis Kr. (= > > you SZ PSOE 
Lestrigonus exulans Kr. (= Hyperia galba p. 562). 
Hyperia oblivia Kr. (= Parathemisto oblivia vp. 567). 
H. Milne-Edwards mentions in his classical work »His- 
toire naturelle des Crustacés» (1840) the same Hyperids from 
the arctic region as Kröyer, and from the antarctic region: 
Themisto Gaudichaudii Guérin (= Euthemisto Gaudichaudi p. 568). 
1 [Hans Strom] Physisk og oeconomisk Beskrivelse over Fogderiet 
Sendmor. Part. 1. Sorge 1762. 4:t0, Pp. L88; 
20. F. Möller, Zoologie Danice Prodromus. Copenhagen 1776, p. 196. 
3 E. Sabine, »Marine Invertebrate Animals>; in A Supplement to the 
Appendix of Captain Parry's voyage for the discovery of a North-West pas- 
sage in the years 1819—20. London 1824. 4:to. p. 234. 
< M. W. Mandt, Observationes in historiam naturalem et anatomiam 
comparatam in itinere groenlandico factx. Berlin 1822. (Dissert.) p. 38. 
5 >»Gronlands Amfipoder>; in Det K. Danske Vidensk. Selskabs nat. og 
math. Afhandl. Deel 7, p. 60 and foll. 
