ABT. 9 MONIEZIA, A GENUS OF CESTODE WORMS TAYLOR 7 



every section that the folds of the uterus passed only dorsally to the 

 longitudinal excretory vessels, occasionally sending a short fold 

 back from the lateral fields ventral to the vessels, but the folds never 

 passing into the lateral fields by this way. It therefore seems 

 'probable that M. pallida is a valid species. 



SUMMARY AND CONCLUSIONS 



1. A number of complete specimens of Moniezla of the two groups 

 M. esepansa and M. planissima have been stained and examined in toto 

 and a remarkable variation found to occur between the different 

 segments in one worm. Although the range of variation is more 

 marked when different worms are compared, it has been shown that 

 extremes of size and shape and of the number of various parts are 

 linked by a series of intermediates which shows no marked discon- 

 tinuity. It therefore must be concluded that these characters are of 

 no specific value. 



The range of variation in the material examined does not com- 

 pletely cover the extremes which have been recorded in the descrip- 

 tion of the various species, but it is highly probable that the exami- 

 nation of more material would extend it to include these also. 



2. Type material of M. alba and M. tHgonophora has been re- 

 examined and it is proposed to place these two species in synonomy. 



3. The validity of the species M. conjugens is questioned, as speci- 

 mens of M. planissima which at first appeared to possess both the 

 linear and the saccular type of interproglottidal gland were shown on 

 closer examination to have only the linear type. 



4. Type material of M. pallida has been re-examined and Monnig's 

 observations on the passage of the uterine folds ventral as well as 

 dorsal to the longitudinal excretory vessels have been verified. 



5. This work has verified the work done by G. Theiler, and it is 

 proposed to synonymise the specific names as follows: 



{a) Moniezia expansa (Rudolphi, 1810) Blanchard, 1891. 

 Synonyms : 



M. oblongiceps Stiles and Hassall, 1893. 



M. trigonophora Stiles and Hassall in Stiles, 1892. 



M. minima Marotel, 1912, 



M. nullicollis (Moniez, 1891) Blanchard, 1891. 

 (6) Moniezia benedeni (Moniez, 1879), Blanchard, 1891. 

 Synonyms : 



M. planissima Stiles and Hassall, 1893. 



M. translucida Jenkins, 1923. 



M. alba (Perroncito, 1878) Blanchard, 1891. 



M. triangularis Marotel, 1913. 



M. latifrons Sauter, 1917. 



M. crassicollis Sauter, 1917. 



