316 
Birge—Notes on Cladocera. 
PLATE XI. 
Fig. 1. Daphnia Kahlbergiensis , Schdlr., var. breviceps , Birge. 
Female. X 60. 
2. “ breviceps . Apex of post-abdomen. X 250. 
3. “ breviceps. Head. X 65. 
4. 5, 7, 8, 9. Daphnia longiremis , Sars. Various forms 
of head. X 65. 
Daphnia breviceps. Head. X 65. 
u longiremis. Female. . X 65. 
u longiremis. Post-abdomen. X 100. 
<£ longiremis. Female from above. The an- 
tennse in this specimen were shorter than 
is usual. X 40. 
11 microcephala , Sars. Head of female.- X 100. 
6 . 
10 . 
11 . 
12 . 
13. 
PLATE XII. 
Fig. 1. Daphnia pulex , var. pulicaria , Forbes. Caudal claw. 
X 250. 
2. “ pulicaria. Head of male. X 160. 
3. “ pulicaria. Post-abdomen of female. X 40. 
4. 5. “ pulicaria. Outline of head of female. X 40. 
6. Ceriodaphnia lacustris. Female. Small specimen. 
X 65. 
7. u lacustris , Birge. Anterior part from 
above. X 65. 
8. u lacustris. Head of female showing spin- 
ules. X 175. 
9. “ lacustris. Apex of post-abdomen. X 175. 
10. Bosmina obtusirostris, Sars. Young. X 75. 
11. “ “ Female. X 75. 
