370 T. B. ROSSETER OX THE ANATOMY OF DICRANOTJENIA CORONULA. 



^, 2. Longitudinal muscles from strobilca. — a, method of spindle- 

 cell attachment. x 260. 



„ 3. Lattice-work muscular structure. X 50. 



,, 4. Group of chalk corpuscles. x 440. 



^, 5. Male and female organs of generation. A, Male, 

 B, Female, x 115. — a, monoecious testicle; h, efferent 

 canal; c, vesicula seminalis superior; cZ, vas deferens 

 exterior ; e, prostate gland (?);/, cirrus-pouch ; g, male 

 genital sinus ; h, cirrus ; i, cirrus sheath ; k, vesicula 

 seminalis " inferior " ; I, vas deferens interior ; m, female 

 genital opening and vagina ; n, vulva ; o, vaginal canal ; 

 p, receptaculum seminis ; q, fructifying canal ; r^, 

 aporose ovary and duct ; r-, porose ovary and duct ; 

 s, shell-gland ; t, yelk-gland ; u, aporose, v, porose 

 uterine canals. 



,, 6. An aggregation of spermatospores. x 1600. 



^, 7. Spermatoblast with developing spermatozoa. x 440. 



„ 8. Cirrus-pouch, x 260. Letters same as Fig. 5. 



,, 9. Early formation of male and female genital sinus. 

 X 260. 



„ 10. Muscular structure of cirrus-pouch. x 115. 



„ 11. Cirrus denuded of its sheath to show flexibility, x 260. 



Plate 19. 



„ 12. 13. Showing spinosity of cirrus-sheath. X 350. 



-,, 14. Vulva, showing exterior spines and smooth vaginal 



canal, x 700. 

 ,, 15. Receptaculum seminis. x 155. 

 „ 16. Fertilising canal, x 350. 

 ,, 17. Ovarian eggs, various stages, x 595. 

 „ 18. Uterine eggs — c, hexacanth stage. x 595. 

 „ 19. Oblique lateral transverse section of proglottis. — h, cirrus ; 



m, female genital sinus: — l m\ longitudinal muscles 



of pouch ; L M-, longitudinal muscles of segment ; 



o M, oblique muscles of pouch in section ; p u P., 



proximal uterine pouch, x 155. 

 „ 20. Undulatory nerve. x 70. 

 J, 21. Development of distal uterine pouches, x 155. 



Journ. Quekctt Microscopical Club, Ser. 2, Vol. VII., JVo. 47, November 1000. 



