388 
Fic. 3 anget castor (?) ae legs of adult female. 
fifth legs 
Fic. 1. Daphnia longispina, 
“ si 
2. 
Se Ue 
4. " = 
5. Daphnia dubia, 
6. “ 
Ti tia 
8. “ ` 
9. f 
ia s adii 
Heterogenetic Development in Diaptomus. 
of male of exaggerated or sion 
* (immature). 
5: " * fifth legs of female. 
6. “ caudal stylets of same. 
T, “ margin of last thoracic segment of same, 
8. v leg of immature specimen of ordinary form just 
to molt. i 
9. “3 antenna of male, giganteus form Gimmatare). 
9a. n antennæ of male, castor adult. 
b. € 
antenna of male, castor, older form. 
10, Epischura Aaii, sp. nov., abdomen and fiith feet of male. 
right foot of he'd 
12; ” right foot of fem 
13. u right foot of anii {yong 
14. sf mandible. 
15. Nd labrum, mandibles sd palpi. 
16. we end of maxilliped. 
iT: i globular pot part of testis. 
18, n end of antennules 
19, va antenna a pee 
20. mming foot, 
21. Cyclops modestus, ee nov., fifth foot, 
: stylets. 
Ea “ end of antenna. 
24. Geia, tenuissimus, sp. nov., fifth foot. 
25. terminal joint of antenna. 
26. ie, E A angulata, mae rs ee antenna. 
as 
28. wer Bit of shell. 
29. bccn ea ae of posterior portion of shell in old 
spines. 
30. Simocephalus daphnoides. 
31. : lower angle of shell, 
EXPLANATION OF PLATE VI. 
s 
10. Daphnia longispina. 
iz, es Platanensis sp. nov., end of postabdomen. — 
12, head 
a reticulations of shell. 
