2 3 6 



THE SPOROZOA 



history were figured and described by Kloss in 1855, but not named by 

 him the first thorough account of any Coccidian. The spores contain 

 five or six sporozoites. K. soror, A. Schn., from the kidney of the water- 

 snail Neritina fluviatilis, is tetrazoic. K. octopiana (A. Schn.), Labbe", 

 from the intestine of Octopus and Eledone, has ten to twelve sporozoites in 

 the spore. 



Genus 14. Caryotropha, Siedlecki, 1902. The spherical spores, 

 about twenty in number, contain each twelve sporozoites. Unique 

 species, C. mesnilii, Siedl. (Fig. 67), parasite of the clusters of spermato- 

 gonia of Polymnia nebulosa. Remarkable for its habitat, this species also 

 shows some interesting peculiarities in its developmental phases (see 

 pp. 223 and 225). 



Genus 15. Klossiella, Smith and Johnstone, 1902. The subspherical 

 spores are polyzoic and contain from thirty to thirty-four sporozoites. 



f. 



FIG. 66. 



Spores of various Coccidian genera, , Minchinia chitonis(E. R. L.), (par. Chiton) ; 6, Diaspora 

 hydatidea, L6ger (par. Pdydesmus) ; c, Echinotpora labbei, Leger (par. Lithobiut mutaWJi*); d, 

 Goussia motellat, Labbe ; e. Diplospora (Hyaloklossia) lieberkiihni (Labbe), (par. Rana esailenta) ; 

 /, Crystallospora cryttalloidet (The!.), (par. Motella tricirrata). b and c after Leger, the others 

 after Labbe. 



Unique species, K. muris, Sm. and Jnst., from the kidney of the 

 mouse. The sporogonic cycle is found in the epithelium of the con- 

 voluted tubules. Another form, representing the schizogonic cycle, 

 apparently, is found in the glomeruli. The very large number of 

 sporozoites is a remarkable feature of this species. 



Doubtful genera are : 



Hyaloklossia, Labbd, 1896, characterised by polysporous oocyste with 

 oval spores which are either dizoic or tetrazoic. The type - species, 

 H. lieberkuhni (Labbe), from the kidney of Rana csculenta, has been 

 found, however, by Laveran and Mesnil [40] to be a Diplospora (vide 

 ante, p. 231) ; but another species, H. pelseneeri, L^ger, is described from 

 the kidney of Tellina, which appears to conform to Labbe"'s generic 

 definition, although the latter was founded on a mistaken observation. 



Goussia, Labb^, 1896, which differs from Cocddium by its bivalve 

 spores (Fig. 66, rf), opening like a pea-pod (Gallice" gousse). The genus, as 

 thus characterised, includes, according to Labbe\ eight species, all infesting 



