772 PROTOZOOLOGY 



P. armata (K.) (Fig. 328, i). Anterior end more or less straight; 

 peristome difficult to see; contractile vacuole central; 70-80ju long; 

 fresh water. 



Genus Helicostoma Cohn. Similar to Philaster in general appear- 

 ance; preoral side-pouch curved around posterior edge of peristome 

 and separated from it by a refractile curved band; with or without 

 a pigment spot near cytostome; macronucleus oval or band-form; 

 contractile vacuole terminal; in salt water. 



H. buddenbrocki Kahl (Fig. 328, j). 130-200/* long; in salt and 

 brackish water. 



References 



Beers, C. D.: (1933) The ingestion of large amoebae by the ciliate 



Frontonia leucas. J. El. Mitch. Sc. Soc, 48:223. 

 Bullington, W. E. : (1930) A study of spiraling in the ciliate Fron- 

 tonia with a review of the genus, etc. Arch. Protist., 92:10. 

 Burbank, W. D.: (1942) Physiology of the ciliate Colpidium col- 



poda. I. Physiol. Zool., 15:342. 

 Corliss, J. O.: (1952) Comparative studies on holotrichous ciliates 



in the Colpidium-Glaucoma-Leucophrys-Tetrahymena group. 



I. Tr. Am. Micr. Soc, 71 : 159. 

 (1952a) Review of the genus Tetrahymena. Proc. Soc. Pro- 



toz., 3:3. 

 Faure-Fremiet, E.: (1948) Doublets homopolaires et regulation 



morphogenetique chez le cilie Leucophrys patula. Arch. d'Anat. 



Micr. Morph. Exp., 37:183. 

 and Mugard, Helene: (1946) Sur un infusoire holotriche 



histiophage, Deltopylum rhabdoides n. g., n. sp. Bull soc. zool. 



France., 71:161. 

 (1949) Le dimorphisme de Espejoia mucicola. Hydro- 



biologia, 1:379. 

 Furgason, W. H.: (1940) The significant cytostomal pattern of the 



"Glaucoma-Colpidium group," and a proposed new genus and 



species, Tetrahymena geleii. Arch. Protist., 94:224. 

 Gelei, G. v.: (1940) Cinetochilum und sein Neuronemensvstem. 



Ibid., 94:57. 

 Kahl, A.: (1931) Urtiere oder Protozoa. Dahl's Die Tierwelt 



Deutschlands, etc. Part 21. 

 Kidder, G. W. : (1941) Growth studies on ciliates. VII. Biol. Bull., 



80:50. 

 and Diller, W. F.: (1934) Observations on the binary fis- 

 sion of four species of common free-living ciliates, etc. Ibid., 67: 



201. 

 , Lilly, D. M. and Claff, C. L.: (1940) Growth studies on 



ciliates. IV. Ibid., 78:9. 

 Kozloff, E. N.: (1946) The morphology and systematic position of 



a holotrichous ciliate parasitizing Deroceras agreste. J. Morphol., 



79:445. 



