SPOROZOA, TELOSPORIDIA, COCCIDIA 279 



number of spherical spores, each with four sporozoites. Para- 

 sitic in the kidneys of the molluscs, Helix and Succinea. 



Klossia helicina Schneider. Kidney parasite of various 

 species of land-snails, belonging to the genera Helix, Succinea, 

 and Vitrina. 



Genus Orcheobius Schuberg and Kunze. Macrogametes 

 vermiform. The spores are not so numerous, each with four 

 sporozoites. 



Orcheobius herpobdellae Schuberg and Kunze (Fig. 117, c). 

 In the testis of the leech, Herpobdella atomaria ( Nephelis vul- 

 garis) . 



Genus Klossiella Smith and Johnson. The oocyst contains 

 a number of spores, each with numerous sporozoites. A micro- 

 gametocyte produces two microgametes. In the kidney of 

 mammals. 



Klossiella muris Smith and Johnson (Fig. 117, d, e). In 

 the kidney of the mouse. 



Genus Legerella Mesnil. The oocyst contains numerous 

 sporozoites. Spores are entirely lacking. In arthropods. 



Legerella hydropori Vincent (Fig. 117,/). In the epithelium 

 of the Malpighian tubules of the water beetles, Hydroporus and 

 Hyphydrus. 



Family 2 Haemogregarinidae Leger 



Genus Haemogregarina Danilewsky. The schizogony takes 

 place in the blood cells of vertebrates. Merozoites develop into 

 gametocytes. The changes which result in the formation of one 

 macrogamete from each of the macrogametocytes and of two 

 or four microgametes from each microgametocyte, take place 

 in the leech or other blood-sucking invertebrates. Zygotes are 

 produced. Development of sporozoites in the invertebrate 

 hosts are illustrated in Fig. 118. 



Haemogregarina stepanowi Danilewsky (Fig. 118). Schizo- 

 gony in the turtle, Emys orbicularis and sexual reproduction 

 in the leech, Placobdella catenigera. The sporozoites are intro- 

 duced into the blood of the chelonian host by the leech {a). 

 They enter the erythrocytes and grow {d-g). In the bone 

 marrow, they undergo schizogony, each producing 12 to 24 

 merozoites Qi). The schizogony is repeated {i). Some mero- 



