STUDIES ON CEYLON H^EMATOZOA. 741 



Studies on Ceylon Hsematozoa. 



No. II. — Notes on the Life-Cycle of Hsemogregarina nicorise, 



Cast, and Willey. 



By 

 Muriel Robertson, M.A. 



With Plates 32-41 and 1 Text-figure. 



Contents. 



PAGE 

 I. OCCTJRKENCE OF THE PARASITE . . . 742 



II. Brief Summary of the Life-history . 742 



III. Phases of the H^mogbegarine in the Blood of 



the Tortoise ..... 743 



IV. Stages of the H^.mogregarine in the Leech .. 751 

 V. General Remarks and Conclusions . . 758 



In 1904 Drs. Castellani and Willey (3) described a lisemo- 

 gregarine from the blood of the common lake-tortoise of 

 Ceyloiij Nicoria trijuga. They named the parasite Hsemo- 

 gregarina nicoriae after its host. Shortly afterwai'ds 

 these authors gave a somewhat fuller account of their obser- 

 vations in the 'Quarterly Journal of Microscopical Science' (4). 



While in Ceylon in 1907-08 I was able, largely through 

 the kindness of Dr. Willey, to collect the material described 

 in the following pages. My observations agree in the main 

 with those of the eai-lier observers already cited. I have, 

 however, been able to supplement their results and to give 



