TWO NEW TAPEWORMS. 705 



when the foi-mer is extruded. The cirrus-sac is short, in that it 

 extends only to the nerve-cord and not as far as to the dorsal and 

 more external of the water-vascular tubes. It appears, however, 

 to be long, because it is thin and with thinnish walls. The vas 

 deferens is coiled and the coil lies partly in the cortex. The 

 vagina ends in a dilated receptaculum seminis ; but this species 

 differs from the other described in the present paper in that the 

 narrow region into which the vagina usually contracts before 

 entering the receptaculum is quite absent. If there be a 

 rudiment of this narrow region it must be at the very point 

 of opening into the receptaculum. 



Text-fiofure 3. 



"^ 



yE. 





it- *lw^ » 



^~'<j^^ '' •er,rb 



t.,' 





^. 



'^ 



Q . -• 



V - • ^- 



U K 



i. 



^: X) 



Section (horizontal) through two adjacent segments of Cotugnia margareta, 

 showing the embryos scattered through the meduUarj^ parenchyma. 



E. embryos. IS', spaces from which an embryo has fallen out. 



A very important character of the genus Cotugnia has not 

 been illustrated by figures in previous accounts *, though it is 

 known and used in the definition of the genus. As, however, 

 there is no particular description, and merely the bare statement 



* The illustration given by Baczynsta (Etudes anatomiques et histologiques sur 

 quelques nouvelles especes de Cestodes d'oiseaux. Neuchatel, 1914, p. 203. fig. 32) 

 is only diagrammatic. 



