25$ HENRY I.. OS150RN. 



of P. amci'icannm the spatulate form will have to remain the dis- 

 tinguishing mark of the genus. Should its rank as a critical fea- 

 ture be lost, it seems that we should then be obliged to bring 

 Gorgodera translncida, and with it some other species of the genus 



into the genus Phyllodistomum. 



HAMLINE UNIVERSITY, ST. PAUL, MINN., 

 February 4, 1903. 



LITERATURE. 

 Braun, M. 



'99 Ueber Clinostomum Leidy. Zool. Anz. , XXII. 

 Looss, A. 



'94 Die Distomen Fische u. Frosche. Bibl. Zool., XVI. 

 Looss, A. 



'99 YVeitere Beitnege zur Kentn. Trem-Fauna .Egyptens. Zool. Jahrb. Syst. , 



XII. 

 Odhner, Th. 



'02 Mitt. z. Kentn. Distom. II. Zur. Kent. Harnblase-distomen der Fische. 



Cent. f. Bakt. u. Parasit., XXXI. 

 Stafford, J. 



'02 The American Representatives of Distomum cygnoides. Zool. Jahrb. Syst., 



XVII., p. 411. 

 Sturgis, M. M. 



'97 Preliminary notes on Distomum patellare, n. sp. Zool. Bulletin, I., p. 57. 



