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PLATE 1 



EXPLANATION of figures 



1 From a Fundulus embryo, of 5.5 mm. total length, showing beginning amoe- 

 boid movements of two cells, a and b, on the border of the round cell area at 

 the posterior extremity of the ventral median fin. The observation extends over 

 a period of fifteen minutes. The last seven drawings were made without change of 

 focus for the purpose of eliminating variation in form due to the examination of 

 different levels, a, b, two connective tissue cells. Ch, prominence on the sur- 

 face of a chromatophore, the body of the cell is not represented. The numerals 

 in this and succeeding figures indicate the exact time at which each recorded 

 drawing was completed. 



2 Connective tissue cells, one of which, a, exhibits transformation from a 

 spindle to a stellate type, and another, b, becomes flattened against a connective 

 tissue fiber. There was an apparent anastomosis between cell a and the proto- 

 plasmic process p of an adjacent cell. /, connective tissue fiber; j, margin of a 

 joint of a fin ray, giving a fixed point in relation to which locomotion may be deter- 

 mined. Other letters and numerals as in the preceding figures. 



3 Two connective tissue cells exhibiting some locomotion. One of these,'o, 

 assumed a lamellar like relation to a fiber bundle while rotating about it. At 

 9.25 a.m. this cell became momentarily so thin as to almost escape observation. 

 Ch, Ch' , chromatophores. Other letters and numerals as in the preceding figures. 



142 



