No. 395.] WORTH-AMERICAN INVERTEBRATES. 887 
strong terminal claws and two or three short, slender seta. Mandible 
stout, palp three-jointed, with a single branchial seta near the base. Feet 
‘as in Cypris, caudal rami rudimentary, consisting of a long seta, with a 
lamellar base bearing a short seta which is usually situated near the base 
of the lamellar portion. Shell compressed. No American forms known. 
13. Scottia Brady and Norman, 1889. 
Shell not unlike that of the tumid forms of Cypris. Natatory sete of the 
second antenne extremely short, not reaching the base of the terminal 
claws. Limbs short and stout ; claws of the caudal rami very stout, short, 
and twisted. No American forms known. 
14. Stenocypris Sars, 1889. 
Natatory sete of the second antenne not reaching beyond the tips of 
the terminal claws. Palp of the first maxilla very narrow, cylindrical, the 
last joint small, the masticatory lobes long and narrow. Caudal rami 
large, rather lamelliform, dorsal edges occasionally pectinate ; claws very 
unequal, both coarsely denticulate; sete of dorsal edge absent or small, 
apical seta long. Parthenogenetic. Shell narrow, height much less than 
half the length. No American forms known. 
15. Typhlocypris Vejdovsky, 1882. 
Second antenne five-jointed in the female, six in the male. Natatory 
sete of the second antenne lacking. No eyes. Branchial plate of the 
second maxilla composed of two unequal plumose seta. No American 
forms known. 
II. CYTHERID. 
Limnicythere Brady, 1868. 
Shell strong, irregularly tuberculate or spinous. First antenne five- 
jointed, with short bristles on their outer edge. Branchial plate of the 
mandibles strongly developed. Caudal rami rudimentary, usually only two 
short bristles. Males rare. 
a. Terminal segment of first antenna seven times as long as wide. 
Second antennæ not especially armed in male. Rudimentary 
caudal rami cylindrical, about three times as long as wide 
L. reticulata Sharpe 
aa. Terminal segment of the first antenna four to five times as long as 
wide. Second antenna of the male has its terminal claw armed 
with three or four strong teeth. Rudimentary caudal rami six to 
seven times as long as broad . . . . L. illinoisensis Sharpe 
