296 ELERY R. BECKER. 



of the body terminate at about the location of the blepharoplasts. 

 In the anterior tip of the cell is a dark spot connected to each 

 axostyle by a fine fiber. 



SUMMARY. 



The intestines of twenty ground squirrels (Citellus tridecemli- 

 neatus) were examined for protozoa. The following species of 

 protozoa were found to be present: Giardia sp.?, Endamceba 

 citelli, Chilomastix magna sp. nov., Trichomonas muris var. citelli, 

 Trichomonas sp.?, Tetratrichomastix (Eutrichomastix) citelli sp. 

 nov., and Hexamitus pulcher sp. nov. The first was found in the 

 small intestine, all the others in the coecum. In this paper all the 

 above species except the first two are described, particular 

 attention having been given to the morphology of the free 

 Chilomastix magna and to its division phases. 



So far as is known, all these protozoa are commensals. Whether 

 or not they assist in the digestion of cellulose, which is said to take 

 place very largely in the cceca of certain animals, is unknown. 



BIBLIOGRAPHY. 

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