624 Fresh-Watcr Entomostraca. [ October, 
in length. The superior antenne, usually very small or nearly ob-. 
solete in the Daphnoidz, are the longer, but they agree with those. 
of other members of the tribe in having little motion or play. These 
many-jointed appendages constitute the trunk of our elephant, 
lying as they do in so close juxtaposition as to seem a single or-. 
gan. The shell of Brosmina is tuberculate and partly, at least, 
reticulated with hexagonal cells. 
A group of smaller animals than any of the above is the old 
family Lynceidæ which is now included in the Daphnide. Many 
genera have been formed, but only one or two are founded on 
reliable generic characters. Aurycercus contains an animal nearly 
as large as Daphnia, but the remaining animals are small and they 
all agree in moving by a steady progressive motion rather than 
by successive bounds, which peculiarity is due to the shortness of 
the antennz. The head is sharper in front and a little black spot 
beneath the eye, which is common to all Daphnide becomes in 
Lynceus and its allies as conspicuous as the eye itself. This spot is 
of unknown use but seems connected with the base of the antenne. 
_ There are representatives of two genera of the family Cyprid@ 
to be found in every pool. These animals are enclosed in a shell 
which covers not only the body but the head also, so that the 
animal can withdraw entirely from view and close his shell about 
him like the mussel, which the shell much resembles in shape. 
The Cypris scurries about with an uncertain running motion, 
reminding one of the haste of an excited man,while the Candona 
loves the bottom. The inability to swim freely is due in Candona 
to the absence of the many sete on the antenne (the principal 
motary organs), which broaden these paddles in Cypris. In this 
sketch only a very few forms have been glanced at, and the legion 
Phyllopoda containing Branchipus and the “brine shrimp,” has 
not been noticed, but objects enough to employ many a leisure 
day have been seen, any one of which might well repay weeks 
of study. 
DESCRIPTION OF PLATES.! 
PLATE AR yi. me longicornis Herrick, back view of female and side view of 
male; a, Si agg rtion of male antennz showing enlarged segments preceding gen- 
iculating j joi 
PLATE I. onli ops ~~ ? > last pair of feet; 1, 2, 3, 4, 5, feet of Cyclops quadri- 
cornis; 6, inferior anten 
PLATE HI.— Sida Spsiatiind Straus. a, 4, c, feet of first, second and last pairs ; d, 
jaw : e, extremity of a pn J, superior antennee. 
PLATE Iv.—1, Bosm siren dbo a, portion of shell with superior antenn®; 
4, anterior antenna ; 2, ppa S Sp. ? 
sed seeder kindness of Prof. N. H. Winchell, Director of AMinnesots Geological sti 
