THE FAIRY SHRIMPS (PHYLLOPODA) 067 



4 (3) Male frontal appendage wanting; male clasping antenna triramose. 

 ^ ^ Polyarttmidla jmlayi Daday ic^oy. 



^ ;?\ The copulatory appendages of this form arc thick, spiny, and shapcti like 



/^V. \ ^ t^sh-hook; the female has a long median fmKcr-Iike apiK-nda«e on the 



dorsal surface above the egg sac. 



PribylofT Islands and Alaska. The genus to which this species belonw is 

 entirely arctic in its distribution. 



Fig. 1016. Polyartemiellajudayi. Dorsal view of head of male X S- (After Daday.) 



5 (2) Eleven pairs of pregenital ambulatory limbs 6 



6 {t,^) Clasping antenna of male biarticulatc 



7 (16) Head of male unarmed in front, basal segment of clasping antenna with- 

 out a laminar appendage. . Family BKANcmNKCTiDAK . . 8 



8(15) Post-genital region 9-segmented, apical article of male clasping antenna 

 triangular and falciform Bramliiiieclii . . 9 



9 (10) Basal segment of male clasping antenna serrate on inner margin. 



Branchinccta paludosa (O. F. Muller) 1788. 



The egg sac of the female is very long and slender. The c(ipulator>' 

 appendage of the male is thick antl arcuate. 



This is an arctic species and occurs in northern Elurope as well as in 

 Greenland, Labrador, and Alaska, in North America. See also Fij?. 101 1 



Fig. 1017. Branchinccta paludosa. Head of male, dorsal view X s- 

 (After Daday.) 



10 (9) Basal segment of male clasping antenna not serrate on inner margin. 1 1 



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. 



Branchineda coloradoisis Packard 1S74. 



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 devdop 

 so early. 



Reported from Colorado where it occurs at an altitude of 11.000 ft. 

 The larvae appear as soon as the ice melts in the spring. 



Fig. 



branchinccta cnloradensis. He.-id of male, fro 

 (After Shantz.) 



13 (12) Basal segment of male clasping antenna armed with a large spmy 

 process, one third as long as the segment, which arises just 

 distal to the middle of the inner margin and projects pro.xi- 

 mally, a prominent finger-like process with a tiiberculatol 

 tip near inner proximal angle. 



Branchincdii packanli Pearse ioi3- 



The five pregenital segments of female produce*! laterally into strong 

 spinous processes; these grow larger posteriorly. Colltvte<l at La Junta, 

 Colorado. 



Fig. 1019. Branchinccta packardi. Basal segment of iccond ititconi ol mxle. 



