266 ZOOLOGY FOR MEDICAL STUDENTS chap, vi 



The last subdivision of the Crustacea^ the Ostracod A, deserves mention 

 for certain genera such as Cypris and Candona are exceedingly common 

 in fresh water. Some of these are remarkable for the fact that the male 

 sex is believed to have completely disappeared, reproduction being entirely 

 parthenogenetic. They are small creatures and are easily recognized by 

 the bivalve carapace similar in appearance at the two ends. 



BOOKS FOR FURTHER STUDY 



The Cambridge Natural History, Vols. IV. (Crustacea and Arachnida), 

 V. and VI. (Protarthropoda; Myriapoda and Insecta). 



Caiman. Crustacea, in A Treatise on Zoology, edited by Sir Ray Lankester, 

 Pt. vii. fascicle 3. 



Hindle. Blood-sacking Flies. 



