ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 



203 



disintegration which, after a few hours, leaves no trace of the creature. 

 In reference to L. striatiis, he deals especially with Miiller's vesicle (a 

 statocyst with an enclosed statolith), and with the peculiar nuclei and 

 their division. Penard remains sceptical in regard to Kasanzeff's theory 

 that L. rostrum can change in L. striatus. As to the unique position of 

 the genus Penard asks whether it is a relict type like Spirula. 



Classification of HaBmosporidia.* — Carlos Franga defines the sub- 

 order Ha3mosporidia as consisting of Protozoa inhabiting the blood- 

 corpuscles, either erythrocytes or leucocytes ; with a schizogonic phase 

 in a Vertebrate and a sporogonic phase in an Invertebrate. The 

 Invertebrate, in which the sexual part of the cycle occurs, represents the 

 primary host, and is the vehicle of transmission. Along with Coccidia, 

 the Hsemosporidia form the order Coccidiomorpha in the class Sporozoa. 

 The author goes on to define the four families — Hsemogregarinidae, 

 Plasmodidffi, Piroplasmidse, and Toxoplasmidte, and the genera they 

 contain. A list is given of the various species recorded, these being 

 arranged so as to show the hosts. 



A provisional classification is submitted : — 



non-pigmented 



/without fla- 

 gelliform mi- 

 ' crogametes 



in the blood 



Hsemosporidia 



i.with flagelli- 

 form micro- 

 gametes, with 

 schizogony in 

 internal organs; 

 genus Leucocy- 

 tozoon : family 

 Hsemamcebidse. 



pigmented, 

 with flagelli- 

 form micro- 

 gametes, with 

 schizogony in 

 blood cor- 

 puscles either free or in organs ; genera 

 Plasmodium, Laverania, Hcemoproteus, 

 Proteosoma, Hcemocystidium, family 

 HaemamcBbidaa. 



Schizogony within 



cysts in internal 



organs ; family Hse- 



J mogregarinidee ; 



2 genera 



' Schizogony in cor- 

 puscles free in cir- 

 culation or in inter- 

 nal organs ; family 

 Piroplasmidse. 

 9 genera. 



\ in organs, non-pigmented without flagelliform 

 microgametes, with schizogony inside cells ; 

 genus Toxoplasma, family Toxoplasmidae. 



* Journ. Sci. Acad. Sci. Lisboa, i. n.s. (1917) pp. 26-65 (many figs.). 



p 2 



