Explanation of Plates. 317 



PLATE XIII. 



Fig. 1. Bunops scutifrons, Birge. Small female. X 65. 



2. Anchistropus minor, Birge. Female from below. X 120. 



3. " " Claw of first foot. X 260. 



4. " " Anterior part of valve. X 120. 



5. " " Post-abdomen. X 260. 



6. Chydorus mgulosus, Forbes. Female. X 100. 



7. " faviformis, Birge. Cast shell of young 



female. X 100. 



8. " faviformis. Post-abdomen. X 260. 



9. Alona falcata, Sars. Female. X 100. 



10. " " Sars. Head from below. X 100. 



11. Pleuroxus hastatus, Sars. Female. 65. 



