. Fresh-water biology. Freshwater biology. THE FAIRY SHRIMPS (PHYLLOPODA) 66f 4 (3) Male frontal appendage wanting; male clasping antenna triramose. Polyartemiella judayi Daday 1909. The copulatory appendages of this form are thick, spiny, and shaped like a fish-hook; the female has a long median finger-like appendage on the dorsal surface above the egg sac. Pribyloff Islands and Alaska. The genus to which this species belongs is entirely arctic in its distribution. Fig. 1016. PolyarlemieUa judayi. Dorsal view of head of male. X 5. (After Daday.) 5 (2) Eleven pairs of pregenital ambulatory lim
. Fresh-water biology. Freshwater biology. THE FAIRY SHRIMPS (PHYLLOPODA) 66f 4 (3) Male frontal appendage wanting; male clasping antenna triramose. Polyartemiella judayi Daday 1909. The copulatory appendages of this form are thick, spiny, and shaped like a fish-hook; the female has a long median finger-like appendage on the dorsal surface above the egg sac. Pribyloff Islands and Alaska. The genus to which this species belongs is entirely arctic in its distribution. Fig. 1016. PolyarlemieUa judayi. Dorsal view of head of male. X 5. (After Daday.) 5 (2) Eleven pairs of pregenital ambulatory limbs 6 6 (33) Clasping antenna of male biarticulate. 7 7(16) Head of male unarmed in front, basal segment of clasping antenna with- out a laminar appendage. , Family Branchinectidae . 8 Post-genital region 9-segmented, apical article of male clasping antenna triangular and falciform. . Branchinecta . 9 Basal segment of male clasping antenna serrate on inner margin. Branchinecta paludosa (O. F. Miiller) 1788. The egg sac of the female is very long and slender. The copulatory appendage of the male is thick and arcuate. This is an arctic species and occurs in northern Europe as well as in Greenland, Labrador, and Alaska, in North America. See also Fig. 1011. Fig. 1017. Branchinecta paludosa. Head of male, dorsal view. X S. (After Daday.) 10 (9) Basal segment of male clasping anteima not serrate on inner margin. 11 11 (14) Basal segment of male clasping antenna with a spiny area on inner margin 12 12 (13) Inner margin of basal segment of male clasping antenna with a rounded tubercle near base and a swollen spiny area just proximal to middle. Branchinecta coloradensis Packard 1874. The segmentation and early development take place under the ice in Alpine Lakes. The eggs of this species are much larger than those of others in the genus. This fact may account for the ability to develop so early. Reported from Colorado where it occurs at an altitude of 11,000 ft. The larvae appear as soo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
