284 ON NEW H^MOGREGARINES. [Mar. 19, 



HiEMOGREGARINA SHATTOCKI Sambon. 



Abstr. p. Z. S. 1907, p. 17 (March 26). 



Habitat. Erythrocytes of Diamond Snake, Python sjnlotes 

 (Lacep.). 



Ckib-shaped. Some forms more slender, 14-15/^ long and 2^ 

 broad, with both extremities rounded and differing only slightly 

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

 of Python molurus, but larger, 22 p. by 4 p. Nucleus median 

 and very large, 9 ju by4jL/. Host-cell sometimes slightly distorted, 

 nucleus pushed to the periphery. 



H^MOGREGARINA REFRINGENS Sambon. 



Abstr. p. Z. S. 1907, p. 17 (March 26). 



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 fx in length by 5-6 ^ in 

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

 literally crammed with rounded, highly i^efractive granules. Host- 

 cell unaltered beyond occasional displacement of nucleus. 



HjEmogregarina mansoni Sambon. 



Abstr. P. Z. S. 1907, p. 17 (March 26). 



Habitat. Erythrocytes of Testaceous Snake, Zamenis flagelli- 

 formis L. 



Oval or bean-shaped cyst 12-13 ^ long by 5-6 jU 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. 



H^MOGREGARINA RAREFACIENS Sambon. 



Abstr. p. Z. S. 1907, p. 17 (March 26). 

 Habitat. Erythrocytes and leucocytes of Couper's Snake, 

 Coluber corais var. cov.peri Holbr. 



1. Slender, elongate, cylindrical forms 14 ju long by 1-5 jx broad, 

 sometimes presenting a refringent granule or vacuole at each 

 extremity. Host-cell aj)parently unaltered or only slightly 

 hypertrophied. 



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

 cytoplasm more or less granular and occasionally vacuolated. 

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

 host-cells containing this foi'm measure about four times the 

 normal size, and are entirely deha?moglobinized and greatly atten- 

 uated. Their nucleus is hypertrophied. Sometimes two or even 

 three parasites may be found in the same host-cell. 



