ON A CESTODE FROM CESTRACION. 413 



19. Shipley, A. E. — "Description of the Eiitozoa," A. Wille3''s ' Zool. 



Results,' part 5. 



20. ZscHOKKE, F. — " Recherclies siir la structure anatomiquc et liistologique 



des Cestodes " 'Mem. de I'lnstitut nation. Geuevois,' t. xvii, 1886 — 

 1889, 



21. ZscnoKKE, F. — " Studieu iiber den anatomisclien und liistologisclien 



Bau der Cestoden," ' Centralbl. f. Bakteriologie u. Parasitenkunde,' i, 

 1887. 



EXPLANATION OF PLATES 22—24, 



Ilhistrating Prof. William A. Haswell's paper " On a Cesfcode 

 from CestracioD." 



List or Eefeeence Lrtters. 



c. Cirrus, c.s. Cirrus sheath, cu. Cuticle, d. Depression at posterior 

 end of free proglottis, d.v.m. Dorso-ventral muscular fibres, e.c.m. Exter- 

 nal layer of circular muscular fibres, e. I. m. External layer of longitudina 

 muscular fibres. ex. Main excretory vessel. f. d. Fertilising duct. 

 //. "Head" of separate proglottis, i.l.m. Internal longitudinal layer of 

 muscle, n. c. Nerve cord. o. d} First part of oviduct. o.dP- Second part of 

 oviduct, ov. Ovary, ow. m. Median part or isthmus of ovary, p. u. Ootype 

 or primary uterus, r.s. Receptaculum seminis. «. r/. Sperm duct. 5. _^. Shell- 

 gland, s. u. Uterus, sw. " Swallowing apparatus." sic. m. Muscular layer 

 of swallowing apparatus, sw.my. Myoblasts of swallowing apparatus, te. 

 Lobes of testis, v. Lobes of vitelline glands, va. Vagina, r. d. Vitelline 

 ducts. v.r. Vitelline reservoir, v.r.c. Constriction at posterior end of 

 vitelline reservoir. $. Male reproductive aperture. ?. Female reproduc- 

 tive aperture. 



PLATE 22. 

 Fig. 1. — Scolex of Phyllobothrium vagans magnified. 

 Fig. 2.— Last proglottis of strobila magnified. 



Fig. 3. — Free proglottis, dorsal aspect. Nervous system, blue; excretory 

 vessels, green; testicular ducts, red. 



Fig. 4. — Portion of transverse section of strobila, showing integument and 

 muscular layers. X 000. 



