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University of California Publications in Zoology [Vol. 20 



Gullet and Reservoik 



The gullet-reservoir structure in Menoidium incurvum (fig. A) is 

 similar to that described for Euglena (Wager, 1899; Haase, 1910; 

 Hamburger, 1911), Astasia (Belaf, 1916), Peranema (Hartmann and 

 Chagas, 1910), Heteronenia (Rhodes and Kirby, MSS), Eutreptia 

 (Steuer, 1904), and Copromonas (Dobell, 1908). The gullet, open- 

 ing somewhat eccentricallj' at the anterior end, is apparently eon- 



par. &.- 



Fig. A 



z~ par. 



Fig. A. Meyioidium incurvum, diagrammatic camera lucida sketch: bleph., 

 blepharoplast ; cary., endosome; cent., extranuclear centrosome; chrom., chromatin 

 granules in resting nucleus; cyt., gullet; fl., flagellum; ntic, nuclear membrane; 

 par. b., paramylum bodies; post., reservoir; rhis., rhizoplast. X 2100. 



Fig. B. Euglena agilis, camera lucida drawing: bleph., blepharoplast; cent., 

 extranuclear centrosome; cyt., gullet; fl., flagellum; par., paradesmose; par. b., 

 paramylum bodies; rhiz., rhizoplast. X 2.500. 



tinuous with a reservoir situated usually near the nucleus (fig. A). A 

 contractile vacuole in connection with the reservoir, as described in 

 Copromonas (Dobell, 1908), Euglena viridis (Wager, 1899), and 

 Eutreptia (Steuer, 1904), has not been observed in Menoidium. Since 

 no ingestion of food particles has been observed and no typical food 

 vacuoles, which are characteristic of holozoic forms, have been seen, 

 the function of the cytostome and gullet is evidently not that of 

 ingestion of solid food. Khawkine (1886) has suggested that the 



