462 PROTOZOOLOGY 



Genus Meroselenidium Mackinnon and Ray. Schizogony intra- 

 cellular, initiated by formation of small masses which give rise 

 to merozoites; about 20 spores from a pair of gametocytes; spores 

 with numerous sporozoites. One species. 



M. keilini M. and R. (Fig. 214, d-f). Large schizonts about 150m 

 by 30/x; sporadins free in gut 200-300m by 40-70/i; paired gameto- 

 cytes 85/1 by 40m; spores 26-28m by 14- 16m, bivalve (?), trans- 

 verse ridges, with many sporozoites; in gut of Potomilla reniformis. 



Genus Machadoella Reichenow. Nematode-like, rigid; simple 

 rounded anterior end; thick pellicle, longitudinally striated; schi- 

 zogony in vermiform stage; head to head association of gameto- 

 cytes; cysts with 3-6 spores, each with 8 sporozoites. 



M. triatomae R. (Fig. 214, g-j). Schizonts about 55m long; game- 

 tocytes 100-120m long; schizogony into 6-8 merozoites; cysts with 

 3-6 spores; spore 10-1 1m by 7-7. 5m; in Malpighian tubules of 

 Triatoma dimidiata (of Guatemala) . 



References 



DoFLEiN, F. and E. Reichenow 1929 Lehrbuch der Proiozoen- 



kunde. 5th edition. Jena. 

 Labbe, a. 1899 Sporozoa. In Das Tierreich. Part 5. 

 Naville, a. 1931 Les Sporozoaires. Mem. d'hist. nat. de Geneve, 



Vol. 41. 

 Wenyon, C. M. 1926 Protozoology. Vols. 1, 2. 



Bhatia, B. L. 1930 Synopsis of the genera and classification of 



haplocyte gregarines. Parasitology. Vol. 22. 

 Goodrich, H. P. 1938 Nina: a remarkable gregarine. Quart. Jour. 



Micr. Sci. (N.S.), Vol. 81. 

 Hatt, p. 1931 L'evolution des Porosporides chez les mollusques. 



Arch. zool. exp., Vol. 72. 

 Hesse, E. 1909 Contribution a I'etude des Monocystidees des 



Oligochetes, Ibjd., Vol. 3. 

 Jones, A. W. 1943 Metamera reynoldsi n. sp., a cephaline gregarine 



from the leech, Glossosiphonia complanata. Trans. Amer. Micr. 



Soc, Vol. 62. 

 Kamm, Ninnie Watson 1922 Studies on gregarines. II. Illinois Biol. 



Monogr., Vol. 7. 

 1922 A list of the new gregarines described from 1911 to 



1920. Trans. Amer. Micr. Soc, Vol. 41. 

 Leger, L. 1907, 1909 Les schizogregarines des tracheates. I, II. 



Arch. f. Protistenk., Vols. 8, 18. 

 and 0. DuBOSCQ 1915 Etude sur Spirocystis nidula L. et D., 



schizogregarine du Lumbricus variegatus Miill. Ibid., Vol. 35. 

 Noble, E. R. 1938 The life-cycle of Zygosoma glohosum sp. nov., a 



gregarine parasite of Urechis caupo. Univ. Calif. Publ. Zool., 



Vol. 43. 



