47 
animal lying in the position shown by Sars, reach about to the 
apex of up3, in none of my specimens (except those from off 
Tjæreby) are they so long; p7 is but a little longer than p5 
(fig. 8). In the large g (20 mm) from ,Snævringen" first joint 
of p4 is broader than drawn by Sars, and the hind corner of 
third epimeral plate is much more acute; but in some specimens 
from a stream at Frisenvold at Randers the hind corner has about 
the same form as shown by Sars. Telson has in several speci- 
mens only one spine on each of the halves. 4 of the specimens 
from Frisenvold have the eyes too large (fig. 9). With the large 
eyes in connection with the short inner ramus of up3, these 4 
spec. thus approach G. Zaddachi Sexton, which is only a variety 
of G. locusta (see above), but unfortunately my material is too 
Small for me to state with certainty that G. pulex is only a variety 
of G. locusta.  Localities see p. 50; 
Strange to say, the distribution of this species does not seem 
to confirm its origin from a marine species. Sars (Account) gives 
the distribution as Norway, (he has forgotten Denmark), Sweden, 
British Isles, Holland, France, Russia, Siberia, and says in a letter 
to Kn. Dahl (Dahl I. c. p. 24) that it has an extremely wide dis- 
tribution in the northern and central parts of Asia, where it has 
its centre of distribution and from where it has distributed itself 
to the west to the Scandinavian countries and to the other parts 
of Europe. It is not found either in America or in Iceland (Sars 
and B. Sæmundsson in Kn Dabl Hi c. p.20) IE is found aft 
Tlemcén in Algeria (Chevreux, Archives Zool. Exp. et Générale, 
Vol. 42 (ser. 5 vol. 2), 1909, No. 2, p. 40), and (?) in Zoetendals 
Valley, Zwellendam district, S. Africa (Kraus, Suidafr. Crust. 1843, 
P. 60). Turkestan, 1615—3200 m (Chevreux, Trav. Soc. Imp. Nat. 
St.-Pétersbourg, vol. 37, 1908, p. 91).  Urmia Sea (N: W. Persia; 
Ginther, Journ. Linn. Soc., Zool., vol. 27, 1899—1900, p. 395). 
Yunnan (China), 7000 feet, and Pamir, 15600 feet (Tattersall, 
Records Indian Mus. Calcutta, vol. 10, 1914, p. 213). 
In Denmark it is common everywhere in fresh water; but in 
Norway it is almost impossible to find it in the West and the South 
in spite of its being very common in the East (Kn. Dahl I. c. p. 
24—31; this paper gives a very elaborate list of its distrib. in Nor- 
Way); it is in Norway found as high as 4000 feet. 
