17 



granules. Parasite lies parallel or obliquely to long axis of host- 

 cell, of which it occupies about two-thirds, without causing much 

 alteration beyond displacement of nucleus. 



H^MOGREGARTNA SHATTOCKI, Sp. n. 



Habitat. Erythrocytes of Diamond Snake, Python spilotes 

 (Lacep.). 



Okib-shaped. Some forms more slender, 14-15 ^ long and 2 fx 

 broad, with both extremities rounded and differing only slightly 

 in thickness. Other forms more bulky, somewhat similar to those 

 of Python vtohorus, but larger, 22 yu by 4^. Nucleus median 

 a,nd very large, 9 ;i by 4 ^. Host-cell sometimes slightly distorted, 

 nucleus pushed to the periphery. 



IliEMOGREGARINA REFRINGBNS, Sp. n. 



Habitat. Erythrocytes of Hoary Snake, Pseudaspis cana L. 



Orescentic, bean-shaped, and discoidal forms occur. The slender 

 crescentic forms have a long, oval, and more or less central nucleus. 

 The bean-shaped forms measure 10-12 ;u in length by 5-6 /^ in 

 width, they have a wide central nucleus, and their cytoplasm is 

 literally crammed with rounded highly refractive granules. Host- 

 cell unaltered beyond occasional displacement of nucleus. 



H^MOGREGARINA MANSONI, Sp. n. 



Habitat. Erythrocytes of Testaceous Snake, Zcmieivis flageUi- 

 formis L. 



Oval or bean-shaped cyst 12-13^ long by 5-6 ^u broad, en- 

 closing club-shaped parasite doubled up in the form of a letter U 

 with both branches of equal length and closely applied. Nucleus 

 median and situated near bend at one pole of cyst. Chromatin 

 arranged in transverse parallel lines or in concentric circles. 

 A characteristic feature is the almost constant presence of two 

 large chromatoid granules usually placed one on each side of 

 nucleus. Host-cell unaltered, nucleus slightly displaced. 



HjEMOGREGARIKTA rarefaciens, sp. n. 



Habitat. Erythrocytes and leucocytes of Couper's Snake, 

 Coluber corals var. couperi Holbr. 



1. Slender, elongate, cylindrical forms 14 ^ long by 1*5 yix broad, 

 Kometimes presenting a refringent granule or vacuole at each 

 extremity. Host-cell apparently unaltered or only slightly 

 hy pertrophied . 



2. Large bean-forms 12-13 fj. long by 4-5 jj, broad, with 

 cytoplasm more or less granular and occasionally Vacuolated. 

 Nucleus small, round, median, with fine chromatin grains. The 

 host-cells containing this form measure about four times the 

 normal size, are entirely dehtemoglobinized and greatly attenuated. 

 Their nucleus is hypertrophied. Sometimes two or even three 

 parasites may be found in the same host-cell. 



