504 Fleterogenetic Development in Diaptomus. [May> 
doubt that it is a new species. A complete diagnosis unfortu- 
nately cannot be given. 
Head remarkably small and produced downward; eye very small; the head ex- 
tends into a beak-like Spot nee the eye; the antennules are very long 
aie as in Moina; the body is longer than in pone and the reticulations 
a double contour line as in c pulchella ; the abdomen is slender and the sides 
ui parallel, the claws being short and truncate, he spines of the usual size. Two — 
summer eggs were in the cavity of the animal figure i 
A fifth ae of Ceriodaphnia was ety in cold springs near — 
Tuscaloosa, Ala., which is not greatly different from C. reticulate — 
as defined by P. E. Mueller and Kurz. 
CERIODAPHNIA (reticulata var.) PARVA, sp. (vel var.) nov. 
+3io—r#is in. long, transparent; head not strongly depressed, somewhat abruptly 
angled in front of antennules; fornices not very prominent; antennules short, coni- 
cal, shell oblong, a in a sharp angle posteriorly, simply reticulated ; abdomen 
rather short, not narrowed very much, distally rounded at the extremity; e 
rather short, a spines short euived. 
This very small species was found in considerable numbers, 
but very little variation in size was noticed. C. pulchella Sats, is 
0.5-0.6™, but the head is quite different, though the abdomen is 
similar, Kurz says also, “ Die schalensculptur ist doppel- -linig,” 
which is not the case in our species. | 
C. quadrangula is 0.6", but several important differences are j j 
observable between the two species. In that species the head is _ 
said to be “ valde depressum, ante basin antennarum ferme nom 
angulatum;” the antennules are large and the abdomen pasty é 
In general appearance this species is a reduced copy of | 
reticulata, but the claws are smooth. Kurz speaks of a pe 
var. of reticulata with smooth claws, but the fornices are then at 
to be sharp. 
EXPLANATION OF PLATE VII. 
= 7 aes’ aseet female, 
. -fifth feet of female. 
MERS : es fifth feet of male. 
de © oee antennules. 
"o s mandible. 
n" Gs ea 
ew Canchocamptus, sp. n, ? fifth foot of female.’ 
qa. fifth foot of male. 
fe Ds s antennules, 
386, antenna of female. 
"ox. s spermathæca. 
= I2. “ stylets of female. 
M23. " stylet of male. 
a MB) a maxilliped. 
