40 OSBORN. [Vol. XVIII. 



'86. Poirier, J, 



Trematodes nouveau ou pen connus. Bull. Soc. Philom. Paris, Ser. 



7, vol. X. 

 '86. Schwartz, W. 



Die postembryonal Entwik. der Trematoden. Zeit. f. w. Zool., 



XLIII. 

 '96. Stafford, J. 



Structure of Aspidogaster conchicola. Zool. Jahrb. Anat., IX. 

 '88. Voeltzkow, A. «» 



Aspidogaster conchicola. Arbeit. Inst. Wurzburg, V. 

 '93. Walther, E. 



Unters. u. Bau d. Trematoden. Zeit. f. w. Zool., LVI. 

 '87. Wright, R. R., and Macallum, A. B. 



Sphyranura osleri. Am. Journal of Morphology, I. 

 '72. Zeller, E. 



Bau u. Entwik. Polystomum integerrimum. Zeit. i. w. Zool., XXII. 



ABBREVIATIONS. 



The same reference letters are used in all the figures. 

 A. Vs. Anterior branch of recurrent vessel. 

 Bdy. Body 

 Cap. Capillary. 



CI. Ch. Cloacal chamber of host. 

 Col. Vs. Collecting vessel of excretory system. 

 Con. Concretion. 

 Cot. Cotylaspis in situ in host. 

 Cr. Cirrus. 

 Cr. S. Cirrus sack. 

 Cr. Sh. Cirrus sheath. 

 Cut. Cuticle. 

 Cy. Cytoplasm of cell. 

 Dpni. Diaphragm. 

 Eg. Egg in uterus. 

 Ep. Epithelium. 

 Ex. Bl. Excretory bladder. 

 Ex. Po. Excretory pore. 

 Ex. V. Excretory vessel. 



F. Foot of host. 

 Fl. CI. Flame cell. 



G. Po. Genital pore. 



/. Br. Inner gill of host. 



Int. Intestine of Cotylaspis. 



Int. Ep. Intestinal epithelium. 



Lb. PL Labial palpus. 



Lot. Com. Lateral compartment of ventral sucker. 



