316 Birge — Notes on Gladocera. 



PLATE XI. 



Fig. 1. Daphnia Kahlbergiensis, Schdlr., vai\ 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. 

 6. Daphnia breviceps. Head. X 65. 



10. u longiremis. Female. X 65. 



11. " longiremis. Post-abdomen. X 100. 



12. " longiremis. Female from above. The an- 



tennas in this specimen were shorter than 

 is usual. X 40. 



13. u microcephala, Sars. Head of female. X 100. 



PLATE XII. 



Fig. 1. Daph?iia pulex, var. pidicaria, Forbes. Caudal claw. 



X 250. 



2. " pidicaria. Head of male. X 160. 



3. " pidicaria. Post-abdomen of female. X 40. 



4. 5. " pidicaria. Outline of head of female. X 40. 



6. Ceriodaphnia lacustris. Female. Small specimen. 



X 65. 



7. " lacustris, Birge. Anterior part from 



above. X 65. 



8. " 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. 



