HOLOTRICHA 621 



C . fusiformis (C.) (Fig. 293,/). Striation spiral; peristome about 

 1/6 the body length; a few cilia at posterior end; oval macronucleus 

 central; contractile vacuole posterior; about 60m long; in fresh water. 



C. cacci Powers (Fig. 293, g). About 32-92^ long; in the intestine of 

 Tripneustes esculentus and other echinoids; Tortugas. 



Family 5 Philasteridae Kahl 



Genus Philaster Fabre-Domergue {Philasterides Kahl). Body 

 cylindrical; peristome about 1/3-2/5 the body length, broader near 

 cytostome and with a series of longer cilia; cytostome with a triangu- 

 lar membrane; cytopharynx (?); ciliation uniform; a caudal cilium; 

 trichocysts; oval macronucleus with a micro nucleus, central; con- 

 tractile vacuole terminal or central; in salt or fresh water. 



P. digiliformis F-D. (Fig. 293, h). Anterior region bent dorsally; 

 contractile vacuole terminal; l()0-150/i long; salt water. 



P. armata (K.) (Fig. 293, i). Anterior end more or less straight; 

 peristome difficult to see; contractile vacuole central; 70-80)u 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. 293, j). 130-200/i long; in salt and 

 brackish water. 



References 



BuLLiNGTON, W. E. 1939 A study of spiraling in the ciliate Fron- 



tonia with a review of the genus and a description of two new 



species. Arch. f. Protistenk., Vol. 92. 

 BuRBANK, W. D. 1942 Physiology of the ciliate Colpidium colpoda. 



I. The effect of various bacteria as food on the division rate of 



Colpidium colpoda. Physiol. Zool., Vol. 15. 

 FuRGASON, W. H. 1940 The significant cytostomal pattern of the 



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



species, Tetrahymena geleii. Arch. f. Protistenk., Vol. 94. 

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



Deutschlands, Part 21. 

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



Vol. 80. 

 D. M. Lilly and C. L. Claff 1940 Growth studies on 



ciliates. IV. Ibid., Vol. 78. 

 NoLAND, L. E. 1937 Observations on marine ciliates of the Gulf 



coast of Florida. Trans. Amer. Micr. Soc, Vol. 56. 



