338 GEOLOGICAL SURVEY OF THE TERRITORIES. 
port on the American Phyllopoda in the volume for 1869 of the Ameri- 
ean Association for the Advancement of Sciences and Arts. These 
specimens possess the elongated claspers, with serrated basal joints, 
and elongated egg pouches of the species of Branchinecta, and are dis- 
tinguished from the Branchipus paludosus of Miiller, also from Green- 
land, (if his figure in the Zo6l. Danica, Pl. 48, be correct) by the much 
shorter lanceolate caudal appendages. In B. paludosa these are repre- 
sented as very slender, acuminate, and half as long as the abdomen. 
“These specimens differ shghtly from the descriptions of B. arcticus 
and groenlandicus, as will appear from the following description. If 
distinct (which may be possible, although I think it more probable that 
the three forms are varieties of one and the same species), the species 
may be designated B. Verrilli. The antenne are slender, linear, and 
nearly as long as the basal joint of the claspers. ‘The large prehensile ~ 
antenne, or ‘claspers,’ as they are called by Verrill, are nearly half 
as long as the body, two-jointed, the basal joint as long as the second, 
nearly straight, and of the same thickness throughout, with a not very 
prominent rounded lobe at the distal extremity on the inner side. This, 
and the distal half of the inner margin, armed with a series of ten or a 
dozen small teeth or spines. The second joint is smooth, slightly taper- 
ing to its distal extremity and concave on its inuer surface. The bran- 
chial feet are eleven in number, and the lobes on the inner margin are 
beautifully fringed with long, close, flexible hairs; the fifth and sixth 
pairs are the longest, and the others decrease regularly in size. The 
vesicular body is narrow, oblong-oval; the terminal lobe of the second 
joint is regularly oval in shape. The caudal appendages lanceolate, 
small; margins with slender sete, which become longer as they ap- 
proach the distal extremity. The specimens are smaller than that col- 
lected by Dr. Packard, averaging only 12 millimeters in length. 
‘‘ Verrill’s specimens of this species were from Labrador, and if, as is 
thought possible both by Packard and Verrill, this species be not dis- 
tinct from the B. groenlandicus and B. coloradensis, it must have a very 
extended geographical range. Specimens of B. groenlandicus are men- 
tioned by Packard as having been obtained during the late American 
expedition of the Polaris at Polaris Bay, between latitudes 81° 20/ and 
81° 50.” ‘ 
BRANCHINECTA COLORADENSIS Packard. 
Plate X, figs. 6,7. 
Branchinecta coloradensis Packard, U. 8. Geographical and Geol. Survey, Report for 
1873, 621, fig. 12. 1074. 
Fic. 19.—Branchinecta coloradensis, male and female, with a view of front of the head of the male, 
showing the claspers; all enlarged. Emerton del. 
Body considerably larger than in B. paludosa; moderately stout; 
head rather large; ocellus larger than in B. paludosa, and the eyes also 
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