H^MOGREGARINES OF KEPT ILIA 



487 



Other parasites are : — H. laverani Simond/1901 , in Emyda granosa Schoepff ; 

 H. mesnili Simond, 1901, in Kachuga tectum Gray; H. billeti Simond, 1901, 

 in Trionyx cartilagineus Boddert; H. stepanoviana Laveran and Mesnil, 1902, 

 in Damonia reevesii ; H. rara Laveran and Mesnil, 1902, in Damonia reevesii ; 

 H. mauretania Sergent, 1904, in Testudo ihera Pall.; H. hagenesis T>vic\oMx., 

 1904, in Clemmys leprosa Schweigg. Its sporogony is said to occur in Placoh- 

 della catenigera Moqu.-Tand. H. vittatcB Robertson is Emyda vittatdj^i'g^. 149, 

 157, and 158). 



Hsemogregarines of the Ophidia. 



The hsemogregarines of Ophidia are numerous, but their life-history has not 

 been properly studied. They have mostly been described by Sambon. 



HaBmogregarina mirabilis Castellani and Willey, 1904 (Fig. 153). 



H. mirabilis is a parasite in the red cells of Tropidonotus piscator Schn. 



The trophozoite is vermicular and large (12 fi), and stains uniformly blue, 

 leaving no clear pole. The nucleus is dense, and placed near the anterior 

 end, and is enclosed in a well-developed cytocyst, which is stippled with 

 Schiiffner's dots. 



Other forms are: — H. pythonis 

 Billet, 1895, in Python reticularis 

 Schn. ; H. pococki Sambon and Selig- 

 mann, 1907, in P. molurus L. ; H. schat- 

 tocki Sambon and Seligmann, 1907, in 

 P. spilotes Lacep.; H. najcB Laveran, 



Fig. 157. — HcBmogregarina vitiates 

 Robertson : a Broad Form, show- 

 ing Peculiar Red Bodies. 



Fig. 



i5». — HcBmogregarina vittatcB 

 Robertson: Gametocyte. 



(After Miss Robertson.) 



1902, in Naja tripudians Merr.; H. mocassini Laveran, 1902, in Ancistrodon 

 piscivorus Pal.; H. cro^a/^ Laveran, 190 1, in Crotalus confluentus ; H. seligmanni 

 Sambon, 1907, in Lachesis mufus ; H. zamenis Laveran, 1902, in Zamenis 

 hippocrepis L.; H. mansoni Sambon and Seligmann, 1907, in Zamenis flagelli- 

 formis L.; H. refringens Sambon and Seligmann, 1907, in Pseudaspis cana L.; 

 H. rarefaciens Sambon and Seligmann. 1907, in Coluber corais Holb.; H. cant- 

 liei Sambon, 1907, in Eryx conicus ; H. terzii Sambon, 1907, in the boa- 

 constrictor; and many others. 



Hsemogregarines of the Sauria. 



The best known of these is H. lacertarum Danilewsky, 1885, in the red cells 

 of Lacerta muralis Laur., L. viridis Laur., L. agilis L., and L. ocellata Daud. 



The young trophozoite grows into a schizont, which is enclosed in a cyto- 

 cyst, and which breaks up into merozoites in the liver, spleen, or kidney. 



Among the merozoites there may be macromerozoites or micromerozoites, 

 which are thought to be precursors of the macro- and micro-gametocytes which 

 develop in Ixodes ricinus L. This tick may infect the lizard in the adult stage, 

 though this must be rare, as it usually attacks mammals, and then only by its 

 nymphae and larvae. 



A number are described: H. thomsoni Minchin, 1907, in the Himalayan 

 lizard [Agama tuberculata) ; H. schaudinni C. Fran9a, in Lacerta ocellata Daud. 



