488 



TELOSPORIDIA 



H^MOGREGARINES OF THE AMPHIBIA. 



The best studied of these is HcBmogregarina minima Chaussat. 



Synonyms, — Drepanidium ranarum Lankester, Laverania mnavum Grassi, 

 H. ranarum Kruse, Lankesterella ranarum Labbe. 



This parasite is found in the red cells, leucocytes, and tissue cells of Rana 

 esculenta L, 



Schizogony takes place in the spleen, liver, kidney, and bone-marrow, where 

 the cytocysts containing round schizonts, which break up into five to eight 

 macromerozoites (5 to 8 fx) or numerous micromerozoites (3 to \ /jl). 



The sporont is club-shaped, and sporogony takes place, according to Billet, 

 in the leech [Helohdella], but his account is very doubtful, and will require 

 confirmation. 



Hintze gives a quite different development in the intestine of the frog, 

 but it is possible that he mistook a coccidial parasite for the sporogenic 

 stages. 



Durham notes a Drepanidium (haemogregarine) in the blood of a toad in 

 Pard, and a Dactylosoma (Labbe) in the internal organs — the former is the 

 schizont, and the latter the sporont — and found evidences of conjugation and 

 cyst-formation in ticks fed on these toads. 



H. splendens Labbe, 1908, is found in Rana esculenta in Portugal. H. lepto- 

 dactyli Lesage, 1908, is found in Leptodactylus ocellatus in Argentina; Lankes- 

 terella tritonis Fantham, 1905, in Triton cristalus. 



HiEMOGREGARINES OF THE' PISCES. 



Fish of all kinds and in all parts of the world appear to contain these para- 

 sites. 



Hsemogregarina simondi Laveran and Mesnil, 190 1. 



H. simondi is a parasite in Solea vulgaris (the sole). Schizogony takes 

 place in the red corpuscles, the schizont dividing longitudinally into two, four, 

 or eight merozoites. Sporogony takes place in Platyhdella solecB Kroger, a 

 leech found on the sole in which ookinetes have been found. 



Hsemogregarina anarrhichadis Henry, 1912. 



H. anarrhichadis is found in the catfish Anarrhichas lupus. 



Other fish heemogregarines are: H. bigemina Laveran and Mesnil, 1901, in 

 Blennius pholis, H. quadrigemina in Callionymus lyra, H. platessce Lebailly, 

 1904, in Pleuronectes platessa, H. rovignensis Minchin and Woodcock, 1910, in 

 Trigla lineata. 



Family Toxoplasmidce Franga, 1917. 



Definition.^ — -Haemosporidia without haemozoin generally living 

 in white cells in the organs of vertebrates. 



Type Q^miS.— Toxoplasma Nicolle and Manceaux, 1908. 



Remarks. — Only two genera. It is possible that some authors 

 might place Elleipsisoma Franga, 1911, and some allied genera 

 therein. At present we have classified these with the Piroplasmidae, 

 Ovoplasma may also come here. 



Classification, — The genera of the Toxoplasmidse may be recog- 

 nised as follows: — 



A. With a definite nucleus — -Toxoplasma. 



B. Without a rmcleM?,— Ovoplasma. 



Genus Toxoplasma Nicolle and Manceaux, 1908. 



Definition. — Toxoplasmidae of oval or reniform shape, reproducing 

 by longitudinal division or by multiple division inside cells. Live 



