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Protozoa in Tipula 
Description of Parasites. 
I. Rhizopoda. 
The Rhizopoda are represented in the gut of Tipula by two small 
forms of Entamoeba. 
1. One of these (Figs. 1 and 2) has a nucleus of the Ainoeba Umax 
type, with well-developed central caryosome and peripheral grains of 
chromatin contained within a very delicate nuclear membrane. 
Fig. 1. 
Fig. 2. 
Fig. 1. Large Entamoeba with nucleus of Amoeba Umax type. 
Fig. 2. Small Entamoeba of same type as in Fig. 1. 
2. The other (Figs. 3 and 4) resembles the entamoebae of verte¬ 
brates^ in that its nucleus has the chromatin concentrated in an 
irregular layer immediately internal to the well-marked nuclear mem¬ 
brane, while the interior contains typically one small central chromatin 
granule. At times the chromatin is collected into two or three large 
caryosome-like masses placed excentrically (Fig. 5): such nuclei re¬ 
semble closely the figures recently given by Hartmann for degenerate 
Entamoeba teUagena. 
Both forms of amoeba have a coarsely vacuolated cytoplasm containing 
numerous inclusions, notably bacilli. There are usually several short, 
blunt pseudopodia, in the formation of which there sometimes appears 
a distinct severance of clearer ectoplasm from more granular endoplasm. 
1 Fantham and Porter (1911) have recently recorded an entamoeba from the hive-bee 
(Entamoeba apis) “ very like Entamoeba coli of the human intestine.” 
