122 



DESCRIPTION OF ANNULOSA, PLATES XLVI. AND XLVII. 

 Platk XLVI. 



Fig. 1 . The entozoon ; natural size. 



a. The head ; the under surface showing the mouth and four prehen- 



sile hooklets (two on either side of the buccal aperture). 



b. The caudal extremity, showing the cleft across it. 



c. The projecting rings. 



Fig. 2. Small entozoon found in the nasal fossa of the Cobra ; natural size. 

 Fig. 3. Large entozoon found in Dr. Sharpey's collection. 



a. Head, with the mouth and four hooklets. 



b. The conical caudal extremity. 



c. The entrance to the vagina. 



d. The anal aperture. 



Fig. 4. Entozoon, fig. 1, dissected. Opened on the dorsum a little to the left of 

 the mesial line. 



a. a. The digestive canal. 



b. The oesophageal ganglion. 



c. The great nerve cords. 



d. The vagina. 



e. e. The uterus or oviduct. 



f,f. The copulatory pouches or testicles (?). 

 g, g. The ovary. 

 h. The fallopian tubes. 

 Fig. 5. Portion of the ovary. 



a, a. The ova, resembling bunches of grapes. 



b, b. The homogeneous membrane loosely covering the ova. 

 Fig. 6. A bunch of ova highly magnified. 



a. The yelk-sac, consisting of a double wall. 



b. The granular yelk. 



c. Germinal vesicle : indicated by the light-coloured space. 



d. Germinal spot. 



Fig. 7. Impregnated ovum from the upper portion of the uterus. 



Plate XLVII. 



Fig. 8. Spermatozoa found in the copulatory pouches or testicles (?). 



a. a. Granular cells. 



b. The imperfectly developed spermatic filaments amassed together in 



large bundles. 



c. Fully formed spermatozoa. 



Fig. 9. Ovum taken from the uterus 6 inches below its upper attachment. 



a. The granular yelk becoming condensed and retracted from the yelk- 

 sac. 

 Fig. 10. View of ovum in a more advanced stage of development. 

 Fig. 11. Profile view of a fully developed ovum. Two sets of hooklets are here 



shown. 

 Fig. 12. Face-view of the same, in order to show the arrangement of the four 



pairs of hooklets, and general form of the animal. 

 Fig. 13. Striated muscular fibres from the parietes of the parent entozoon. 

 Fig. 14. Magnified view of a small portion of the uterus, to shew its double layer 



of non-striated muscular fibres. 



