No. 395.] MORTH-AMERICAN INVERTEBRATES. 885 
ee. Subterminal claw of the caudal ramus nearly as 
long as the terminal. Shell half as high as long 
C. altissimus Chambers 
cc. Terminal claw of the second foot twice as long as the termi- 
nal segment. Shell fully three times as long as high. 
Subterminal claw of the caudal ramus half as long as the 
terminal . . C. fasciata O. F. Mueller * 
bb. Both spines on the first iqadibulac process of the first maxilla 
toothed. 
c. Shell not reticulated with broken lines. 
d. Shell less than twice as long as high, terminal claw of 
the caudal ramus half as long as the ramus. 
é. Subterminal claw of caudal ramus three fourths as 
long as the terminal . C. ¢estudinaria Sharpe 
ee. Subterminal claw two thirds as long as the terminal 
C. fuscata (Jurine) 
dd. Shell more than twice as long as high. Terminal claw 
of the caudal ramus one third as long as the ramus. 
Subterminal claw two-thirds as long as the terminal 
C. fischeri Lilljeborg * 
cc. Shell reticulated. Terminal claw of the caudal ramus nearly 
ree fifths as long as the ramus, terminal seta not more 
than one fourth as long as the terminal claw 
C. reticulata Zaddach 
aaa. Length between two mm. and three mm., third and fourth joints of 
the first foot fused . . . . . . « C. pubera O. F: Mueller* 
g. Erpetocypris Brady and Norman, 1889. 
General characters of the animal closely approaching those of Cypris ; 
but the natatory sete of the second antennz do not reach nearly to the tips 
of the terminal claws, and they are not plumose. Second maxilla bears a 
branchial plate. Cannot swim, creeps along the bottom. Most forms 
parthenogenetic, some sexual. 
a. Length about fourmm. Claw on the last joint of the second foot 
seven-eighths as long as the last segment. Dorsal seta of the 
caudal ramus serrate and claw-like, close to the subterminal claw ; 
dorsal edge of ramus finely toothed ; ramus twenty times as long 
as wide; terminal seta about one third as long as the subterminal 
claw. Shell twice as long as high, the upper margin nearly straight 
E. barbata (Forbes) 
aa. Length between two and three mm. . 
6, Claw on last joint of the second foot as long as that joint, shell about 
twice as long as high. Caudal ramus about ten times as long as 
wide, dorsal margin finely toothed Æ. strigata (O. F. Mueller)* 
