338 



GEOLOGICAL SUEVEY OF THE TERRITORIES, 



port on the American Phyllopoda in the volume for 1869 of the Ameri- 

 can Association for the Adyancemeut 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 Brcmchipus paludosus of Miiller, also from Green- 

 land, (if his figure in the Zool. Danica, PI. 48, be correct) by the much 

 shorter lanceolate caudal appendages. In B. paliidosa these are repre- 

 sented as very slender, acuminate, and half as long as the abdomen. 



''These specimens differ slightly from the descriptions of B. arcticus 

 and groenlandicus, as will appear from the following description. If 

 distinct (which may be possible, although 1 think it more probable that 

 the three forms are varieties of one and the same species), the species 

 may be designated B. YerrilU. The antennse are slender, linear, and 

 nearly as long as the basal joint of the claspers. The large prehensile 

 antennae, or 'claspers,' as they are called by Yerrill, 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 inner 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, 

 Kiuall; margins with slender setse, 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. 



" VerrilFs 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. groenlcmdicus and B. coJoradensis, it must have a very 

 extended geographical range. Specimens of B. fjroenlandicus 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 

 810 50'." 



Branchinecta coloradensis Packard. 



Plate X, figs. 6, 7. 



BrancMnecta coJoradensis Packard, U. S. Geographical and Geol. Survey, Report for 

 1873, 621, fig. 12. Ie74. 



Fig. 19. — BrancMnecta color adensis, male and female, ■with a vie"W of front of the head, of the male, 

 showing the claspeis ; all enlarged. Emerton del. 



Body considerably larger than in B. paludosa; moderately stout; 

 head rather large ; ocellus larger than in B. imludosa^ and the eyes also 



