CRUSTACEA. 
617 
and regarded as olfactory organs by others. The animal lives in the lake 
Mjosen from 3 and 6 to 200 fathoms, and is gregarious, as other species of the 
same genus ; it lives also in several large lakes of Sweden, and in Lake 
Ladoga. It cannot be distinguished as a separate species from the marine 
Mysis oculata from Greenland. 
TETRADEOAPODA. 
AMPHIPODA. 
Gammarus neglectus (Lilljeborg) = ?«cw5^7'f5 (Sars, 1863), in the mountain- 
lakes of Norway, for example Afsjo and Vaalasjo on the DorreQeld, the prin- 
cipal food of Salmofario ; its external and anatomical characters described by 
G. 0. Sars, 1. c. pp. 46, 47, pis. 4, 5, and 6, figs. 1-20. The copulation and 
development of the eggs has been observed by the author, and the existence 
of a micropylic apparatus discovered and described, p. 66. 
Pallasca cancelloides (Gerstfeldt, Sp. Bate), var. qmdrtspinosa (Esmark), 
from the lake Mjosen and others in Norwaj'^, described and figured by G. 0. 
Sars, 1. c. pp. 08-78, pi. 0. figs. 21-34. 
’ Qammar acanthus loricatus (Sabine), var. lacustris, from the same lake, only 
in a depth of nearly 1200 feet ; adult and young states described and figured 
by G. O. Sars, 1. c. pp. 73-82, pi. 7. figs. 1-8. The slight differences from the 
arctic marine G. loricatus are attributed by the author, as by Lov4n, to 
arrested development. 
Pontoporeia affinis (Lindstr6m)=/ew?op«^«, var. (Sars, 1862), in small 
lakes near Christiania, described and figured by G. O. Sars, 1. c. pp. 82-90, 
pi. 7. figs. 10-26, pi. 8. figs. 1-6. The genus Pontoporeia is reunited with 
Lysianassa by the author, p. 82, note. 
Pontoporia femorata (Kroyer), Packard, Mem. Bost. Soc. Nat. Hist. i. 
p. 300, pi. 8. fig. 7, Belles Amours, Straits of Belle Isle, Labrador. 
Monoadodes nuheculatuSy sp. n., Packard, 1. c. p. 298, pi. 8. fig. 4, Caribou 
Island, Labrador. 
Calliope Iceviusc^ula (Kroyer), Packard, 7 c. p. 298, pi. 8. fig. 2 (front leg), 
Labrador. 
Atylus inermis (Kroyer), Packard, 1. c, p. 298, pi. 8. fig. 3, Henley Harbour, 
Labrador. 
Ampelisca yaimardi (Bate, fide Beck), Packard, 7 c, p. 299, pi. 8. fig. 1, 
Chateau Bay, Labrador, 
ISOPODA. 
Idoteiuas. 
^Idotcca ‘marmorata, sp. n., Packard, Mem. Bost. Soc. Nat. Hist. i. p. 290, 
pi. 8. fig. 6, Sloop Harbour, Kynetarbuck Bay, Labrador. 
AsELLIDA5. 
Asellus aquaticus. Common in pools and marshes of Norway, even in 
those drying up during the summer, in which case it remains in the mud in 
a torpid state. Its external forms, anatomy, and development ficm the egg 
are described and figured by G. 0. Sara, 7 c. pg. 93-123, pi. 8. figs. 6-28, 
pis, 9 and 10, 
