UX A NEW UUMAX TAPE-WORM (BOTHRIOCEPHALUS SP.). 



885 



Explanation of Plate XVIII. 



a, dorsal groove along the series of main 



genital ducts. 



b, ventral groove along the same. 

 fir, cirrus. 



(•/;•, 0., cirrus opening. 



dtH-, yolk-duct. 



(Iti<., yolk-gland or vitellarium. 



//., testes. 



Im., longitudinal muscular layer. 



In., longitudinal nerve. 



/»—/»., median-line of the specimen. 



07'., ovary. 



ord., oviduct. 



,9h., receptaculum seminis. 



tm., transverse muscular layer. 



lit., uterus. 



lit. 0., uterine opening. 



var/., vagina. 



vap. 0., vaginal opening. 



ihL, vas deferens. 



Fig. 1. 



Fig. 7. 



Fig. 8. 

 Fig. 9. 

 Fig. 10. 



Fig. 11. 



Fig. 1'2. 



A piece from sample No. 4, 40 cm. from the liind end of the original speci- 

 men. Dorsal view. Nat. size. 

 Ventral view of the same. Nat. size. 



Cross-section of the same. Nat. size. The two hlack spots represent the 

 uteri filled with eggs. 



Dorsal view of a portion of the same. Magnified 10 times. 

 Ventral view of a portion of the same. Magnified 10 times. 

 Ventral view of another portion of the same, with cirri partially protruded. 

 Magn. 10 times. By an oversight this figure has been placed in a posi- 

 tion the reverse of that intended. 



Portion of a preparation from sample No. 4, seen from the ventral side. 

 Magn. 20 times. The piece was somewhat compressed between two 

 glass-plates, coloured and clarified. The numerous dot-like bodies on 

 either side of the uteri represent yolk-gland lobules of the ventral side. 

 Portion of a cross-section of sample No. 4. Magn. 20 times. 

 An egg taken from the uterus. Magn. 440 times. 



Half-diagrammatic representation of a left set of main genital ducts, as 

 seen from the ventral side; made out by combining sections of sample 

 No. 2. Magn. 150 times. 



A portion of sample No. 1. Magn. 10 times. This figure is a failure in 

 so far as it does not properly show the ordinal distinctions of proglottidal 

 boundaries. 

 Portion of longitudinal section passing through tlie cirri, from sample No. 2. 



