The President's Address. By H. G. Flimmer. 143 



■stitutes sporogony. The fertilized cell, now called a zygote, alters 

 its shape and becomes motile, and is called an ookinete, and this, 

 by division, gives rise to many small bodies called sporozoites, 

 which then get into the animal's blood, and begin to cycle again. 



Hfemogregarines occur chiefly in the great group of reptiles, 

 but they have been described also in mammals. I have found 

 them in 150 reptiles of 67 different species, and in 42 of these 

 species for tlie first time. The schizont is found generally in the 

 erythrocyte of the host, and is an elongated body with a well 

 marked nucleus, and with no pigment. Schizogony occurs in the 

 erythrocytes, but more generally in the internal organs ; this 

 stage, however, has not yet been observed in all cases. Nothing 

 is definitely known as to the exact changes in sporogony, which 

 is supposed to occur in insects, ticks, or leeches. Sporonts are 

 also often met with in the corpuscles. They have all a well- 

 marked capsule when within the cell, but if the blood be allowed 

 to remain for some time after its removal from the body the para- 

 site will come out of its capsule and corpuscle. When they have 

 grown to a certain length, many of them will double one end over 

 on itself, producing an appearance something like the top of a 

 crochet-needle. They vary much in their effect on the cell and 

 on the nucleus, and I have indicated in the following table the 

 most obvious of these effects. With some htemogregarines very 

 little change takes place in the cell ; with others the cell gets 

 smaller and out of shape ; with others it gets enormously enlarged 

 and dehtemoglobinized. Others, again, destroy the nucleus, like 

 the Karyolysus of lizards and snakes, I have found a very remark- 

 able one of a new type in a Bengal Monitor. It divides the nucleus 

 of the cell into two parts, which remain connected by a thread of 

 nuclear material, which has a tiny enlargement at its central point. 

 I have found that the schizogony of this parasite takes place in 

 the luDg. Some infections are very severe, scarcely a cell is un- 

 aftected, and I have found as many as four parasites in a cell in 

 some instances. 



H^MOGBEGAEINES FOUND IN THE BlOOD OF E.EPTILES. 



Habitat Character 



3 Moorish Geckos — Tarentola mauri- 



tanica Mediterranean Parasites large and 



doubled over at 

 one end, sometimes 

 at both 



Bengal Monitor — Varanus bengalensis . . India . Nucleus of cell di- 



vided into two by the 

 parasite, with con- 

 necting thread. Schi- 

 zogony in lungs. 

 There was also a 

 hsemogregarine of 

 ordinary type in this 

 Monitor. 



