456 \V. N. F. WOODLAND 



flattened, usually broader than the body and with fim- 

 briated edges, but very contractile and variable in form ; 

 longitudinal grooves absent on head. Genital apertures 

 in last fifth of body-length.^ Post-ovarian vitellaria are 

 present. Eggs measure about 60 microns in length. 

 Parasitic in intestine of Cyprinidae, Europe. 



C. tuba, Wagener, 1854 (' Mono hot hrium tuba'). 



Length of body 10-30 mm. ; breadth of body 0-9-1 mm. 

 Body and head oval in transverse section. Hind end 

 slightly tapering and pointed. Head 'stumpy', i.e. 

 bluntly rounded in outline and not broader than body ; 

 longitudinal grooves absent on head. Genital apertures 

 situated anterior to the last fifth of the body.^ Post- 

 ovarian vitellaria are present. Eggs ? Parasitic in intes- 

 tine of Tinea chrysitis, Italy. 



C fennicus,^ Schneider, 1902. 



Length of body 5-9-5 mm. ; breadth of body 0-4-0-5 mm. 

 Body and head somewhat flat in transverse section. 

 Hind end bluntly pointed. Head rounded in contour 

 and not broader than body ; longitudinal grooves absent 

 on head. Genital apertures as in C. laticeps. Post- 

 ovarian vitellaria present. Eggs measure about 60 microns 

 in length. Parasitic in intestine of Leuciscus erythro- 

 p h t h a 1 m u s , Finland. 



C. syrdarj ensis , Skrjabin, 1913. 



Length of body 6-3-16 mm. ; breadth of body 1-1-5 mm. 

 Body and head somewhat flat in transverse section. 

 Hind end bluntly rounded. Head slightly flattened and 

 slightly broader than body, with distinct ' faserzellen- 

 strange ' ; longitudinal grooves absent on head. Genital 

 apertures apparently as in C. laticeps. Post-ovarian 

 vitellaria are present. Eggs measure about 63 microns in 

 length and 48 microns in breadth. Parasitic in intestine 

 of Schizo thorax intermedins, Piusso-Turkestan. 



^ Statement based on measurements of four individuals in my posses- 

 sion. 



^ Statement based on the iigures supplied by Montieelli (15) and 

 Wagener (25). 



^ Skrjabin (23) is mistaken in supposing that in C. fennicus alone 

 do the coils of the uterus ever extend anterior to the vagino-uterine 

 aperture : I have seen this anterior extension in at least two specimens 

 of C. laticeps (PI. 24, fig. 10). 



