SPOROZOA. 865 



I. Monocystidea. Body not septate. 



(i) Coccidiidae : a provisional group distinguished from (ii) infra, by the fact 

 that the various genera appear to be intra-cellular parasites throughout their whole 

 lives, the cyst being extruded when it is fully formed : subdivided by Schneider 

 into three sub-groups. 



(1) Monosporea : the contents of the cyst constitute a single spore. 

 Orthospora, from the intestinal epithelium of the Newt ( Triton) ; the spore gives 

 origin to four falciform bodies. Eimeria with three species, one from the intestine 

 of the mouse, the kidneys of the horse, &c., a second from the intestine of Litho- 

 bius, a third from the Malpighian vessels of Glomeris ; the cyst has one to two 

 micropyles, and the falciform bodies are produced by a process of one-sided 

 gemmation. 



(2) Oligosporea : the cyst gives origin to a few spores, constant in number. 

 Cyclospora, two species, one from the intestine of Glomeris, the other from that of 

 the cat ; two spores with 2-4 falciform bodies apiece. Isospora, from Limax two 

 spores with many falciform bodies. Coccidium, sp. ? from various Vertebrata ; cyst 

 ovate with a micropyle, four spores, each with but one falciform body. 



(3) Polysporea : the cyst gives origin to a number of spores with 2-4-6 

 falciform bodies apiece. Klossia with several species from the nephridia of Helix 

 hortensis, Succinea amphibia, Neritina fluviatilis, and Chiton, and nearly every 

 organ of Sepia and Octopus : from Blaps, Gyrinus, and Scolopendra morsitans. 



(ii) Monocystidae : free in the unencysted condition. Several genera, e. g. 

 Adelea, from intestine of Lithobius; Monocystis from the vesiculae seminales ofl,um- 

 bricus ; Urospora from the Ascidian dona intestinalis, Tubifex, Sipunculus, various 

 Nemerteans, &c. 



II. Polycystidea. Body septate ; rarely consisting of two segments only from 

 the first (Gamocystis, Porospora (?)), usually of three, an epimerite, which is eventu- 

 ally cast off more or less completely, a protomerite, and deuteromerite. A large 

 number of genera is known, e. g. Clepsidrina, Stylorhynchus : but their arrangement 

 into families is uncertain at present. Schneider is treating of them in his Tablettes 

 Zoologiques and promises a complete monograph. 



The remaining sub-classes contain but few genera and do not need subdivision. 



Biitschli, Bronn's Klass. und Ordn. des Thierreichs, i. Protozoa, pp. 479-616. 

 Balbiani, Le5ons sur les Sporozoaires, Cours d'Embryologie compare'e du College 

 de France, Paris, 1884. 



(i) Gregarinida. Coccidiidae: Schneider, A. Z. Expt. ix. 1881 ; Id. Klossia, 

 op. cit. (2), i. 1883; Id. Tablettes Zoologiques, i. Poitiers, 1886, pp. 4, 88, cf. p. 

 104. Globidium (= Eimeria l) t Flesch, Recueil Zool. Suisse, i. 1884. Gymnospora, 

 Moniez, Bull. Soc. Zool. France, xi. 1886. New Sporozoa, Pachinger, Z. A. ix. 

 1886, p. 471. Cf. Leuckart, 'Parasites of Man,' transl. by Hoyle, i. Edinburgh, 

 1886, p. 202. Monocystidae nd Polycystidea, Schneider, A. Z. Expt. ii. 1873; iv. 

 1875; x. 1882; Id. Tablettes Zoologiques (supra], pp. 25, 90. Gregarines of 

 Earthworm, Ruschhaupt, J. Z. xviii. 1885. Marine Gregarines, Frenzel, A. M. A. 

 xxiv. 1885. Monocystid of Blatta Americana, Kunstler, C. R. 98, 1884. Neozygetis 

 Aphidis, Witlaczil, A. M. A. xxiv. 1885. Gregarines of Phalangidae, Rossler, 



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