Ceriodaphnia scitula (small tens Ephippial female. 
2. Bosmina longirostris. — bie co aac 
2 ue ‘“  lilljeborgii. After P. E. matin Oe [ene 
4, ‘« _ Hook on the first foot of Maples oF eet epee 
5. Scapoleberis mucronata. Se eh 
6. ‘*  cornuta. Head. oa 
7. ‘© angulata. Head. = ee 
7a. ‘‘  angulata. Angle of shell. eas Sh, a 
8. Pleuroxus denticulatus. Male. eae <a 
9. Simocephalus americanus. Head of forint gS Oke 
10. Bosmina. Post-abdomen of male (after Weismann). 
