PLASMODIUM. 271 



may not be altered in size. Hsemozoin pigment present. 

 Gametocytes more or less resemble the schizonts in form ; 

 in the fully grown condition are usually circular discs which 

 more or less completely fill the infected red blood- corpuscle. 

 Parasites of man and other mammals. 



Remarks. — Coatney and Roudabush (1936) have given 

 a Hst of all the known species of the genus Plasmodium together 

 with the hosts from which each was described. 



232. Plasmodium vivax (Grassi & Feletti). (Fig. 123 (PI. I.)). 



Plasmodiutn var. tertiana, Golgi, 1889, p. 173. 



Plasmodium malariee var. tertianse, Celli & San Felice, 1891. 



Hcemamceba febris tertiana, Marchiafava & Bignami, 1891. 



Hsemamoeba vivax, Grassi & Feletti, 1892, p. 10. 



Hgatnamoeba laverani var. tertiana, Labbe, 1894, p. 170, pi. ix. 



Plasmodium malarise tertianum, Labbe, 1899, p. 82, fig. 147 a. 



Hcemamosba malarise var. magna, Laveran, 1900. 



Plasmodium vivax, Liihe, 1900, p. 460 ; Neveu-Lemaire, 1900, 

 p. 9, pi. i, fig. 2. 



Hsemamoeba malarix var. tertianse, Laveran, 1901. 



Plasm,odium vivax, Schaudinn, 1902, pp. 169-250, pis. iv-vi ; 

 Minchin, 1903, pp. 243-54, 267, 332, 351 ; Doflein, 1909, 

 pp. 670-3, figs. 612-15 ; Minchin, 1912, pp. 137, 358, 359, 360, 

 figs. 72, 156. 

 ■^Plasmodium vivax. Row, 1917, p. 392, pis. xx— xxii. 



Plasmodium, vivax,Cast6\\&-n.\ & Chalmers, 1919,pp. 510-12, figs. 166, 

 169 ; pi. i, figs. 16-8 6; Miihlens, 1921, pp. 1495-9 ; pi. xxx, 

 figs. 1-36; pl.xxxi,figs. 1-8; pl.xxxii, figs. 1-15 ; pi. xxxiii,fig. 4; 

 Thomson & Woodcock, 1922, pp. 1517-29, pi. Ixiii, figs. 1-37 ; 

 pi. Ixiv, figs. 38-47, 50-7 ; text-figs. 540-4 ; Hegner & Talia- 

 ferro, 1924, pp. 317-26, 329-30 ; pi. i, fig. 124 ; Craig, 1926, 

 pp. 393-413, figs. 67-70 ; Wenvon, 1926, pp. 925-34, pi. xii, 

 figs. 1-35 ; fig. 400 ; Hehir, 1927, pp. 164-6, pi. x, figs. 1-37 ; 

 pi. xi, figs. 38-47, 50-7 ; text-fig. 581. 

 ■fPlasrnodium vivax, Knowles, 1927, pp. 7-11, pi. i, figs. 1-31 ; 1928, 

 pp. 383-9, pi. xi. 



Plasmodium vivax, Reichenow, 1929, pp. 998-1004, fig. 975, f-l, 

 figs. 976-86 ; Kudo, 1931, p. 286, figs. 120, 121, a-g ; Calkins, 

 1933,p.238,fig. 124,^, B; pp. 406-10, pi. i, figs. 1-6"; Brumpt, 

 1936, pp. 432-8, figs. 190-2; Coatney & Roudabush, 1936, 

 p. 340. 



The Cycle in Man. — Sporozoites are long and slender, 

 10-12 ju- by 1-2^, and are introduced into the blood through 

 the bite of an infected mosquito. After entering the corpuscle 

 the sporozoite contracts to form a disc of cytoplasm with 

 a single nucleus, and soon develops a vacuole, thus resembling 

 a signet-ring. The rings are comparatively large, not as a rule 

 at the edge of a red blood-corpuscle, and usually not more than 

 one in each corpuscle. A ring occupies about one-third the 

 diameter of the corpuscle. In blood-films of heavy infections 

 there may also be young forms at the edge of the red corpuscles 

 (marginal forms). They may be seen in stained specimens, 

 either as little streaks of blue cytoplasm with a red nucleus 



