488 MICHAEL F. GUYER, 



1) Joints very thin, nearly transparent, equally narrow, transverse 

 diaraeter about 4 mm, longitudinal about 12 mm. 



2) Genital openings very small and without external Ups. 



3) No pigment in either vagina or spermatic duct. 



4) Uterus more regulär than either T. solium or T. medicanel- 

 lata, yet more resembling the latter. 



5) Branches of uterus, about 30 in number start from the raain 

 Stern, either at right angles or at angles of about 45 degrees. 



6) Branches of uterus always quite parallel, and generally straight ; 

 but whenever bent, all makes the same angle. 



7) Branches of uterus never arborescently divided, nor furcated 

 at the ends, except the foremost and hindermost in each Joint. 



8) Eggs 0.033 mm long by 0.030 mm broad. 



Comparing the above summary with the following which embraces 

 corresponding anatomical points in the structure of T. confusa, but 

 little sirailarity between the two forms is seen to exist. 



1) Joints thin, not transparent, equally narrow, transverse dia- 

 meter 3.5 to 5 mm, longitudinal 27 to 35 mm. 



2) Genital openings not exceptionally small and with very 

 distinct external Ups. 



3) Deposits of pigment, plentiful in both vagina and spermatic 

 duct, the former being especially prominent in most of the ripe 

 proglottids. 



4) Uterus 1 e s s regulär than that of either T. solium or T. medio- 

 canellata, yet more resembling the form er. 



5) Branches of the uterus from 14 to 18 in number, which start 

 from the main stem very irregularly as regards angles. 



6) Branches of uterus rarely parallel or straight, whenever bent, 

 they exhibit no regularity in the shape of the angles. 



7) Branches of uterus often arborescently divided, and often 

 furcated at the ends throughout the entire proglottid. 



8) Eggs 0.039 mm long by 0.030 mm wide. 



The following table is a summary of the principle points of dif- 

 ference between T. confusa and the two common forms of Taenia 

 found in the human alimentary canal. The measureraents for T. sagi- 

 nata and T. solium are quoted for the most part from Leuckart 



(1888): 



