The Sexual Conditions of Myzostoma glabrum (F. S. Leuckart). 323 



List of Authors cited. 



1. Beare], J., The Life-History and Development of the Genus Mìjzostoma 



(F. S. Leuckart). in: Mitth. Z. Stat. Neapel 5. Bd. 1884 pag. 544—580. 



2. • The nature of the Herniaphroditism of Myznsioyna. in Z. Anzeiger 



17. Jahrg. 1894 pag. 399—404. 



3. Graff, L. von, Verzeichnis der Myzostouiiden. in: Bull. Mus. Comp. Z. 



Harvard Coli. Cambridge Voi. 11 1883 pag. 125—133. ' ' 



4. Report on the "Myzostomida etc. in: Challenger Rep. Voi. 10 1884 



pag. 1-84. 

 5. Supplement to the above. ibid. "Voi. 20 ISST pag. 1 — 16. 



6. Nansen, Fridtjof, Bidrag til M3'ZüStomernes Anatomi og Histologi. Bergen 



1885. 



7. Prouho, Henri, Dioicité et hermaphroditisme chez les Myzostomes. in: 



Z. Anzeiger 18. Jahrg. 1895 pag. 392—395. 



8. AVheeler, W. Morton, The Sexual Phases of Myzostoma. in: Mitth. Z. Stat. 



Neapel 12. Bd. 189G pag. 227—302. 



Description of Piate 10. 



Alphabetical references. 



co coelom N.o Nansen's organs. 



cu cutis. O.C egg-cell. 



ec ectoderm. 'p.e peritoneal epithelium. 



g gut. sp spermatozoa. 



n.s nervous system. sp.c sperm-mother-cells. 



AH the figures except fig. 16 are from specimens of Myzostoma glahrum. 



Fig. 1. Section of young herraaphrodite (tab. 2 no. 4) showing a regulär ovarian 

 epithelium [o.c] lining the dorsal aspect of the peritoneum. Zeiss obj. F. 

 oc. 2. = 500 diam. 



Fig. 2. A similar section (tab. 2 no. 3) showing the same regulär ovarian epithelium 

 [o.c], but with growth of the egg-cells. Zeiss obj. F. oc. 2. = 500 diam. 



Fig. 3. From the same specimen as fig. 2. Here one egg-cell is rather large. 

 A gi-oup of sperm-cells [sp.c) in the cutis. Zeiss obj. F. oc. 2. = 500 diam. 



Fig. 4. Section of a young hermaphrodite (tab. 2 no. 11). Here, owing to growth, 

 the ovarian epithelium of the ccelom is no longer very regulär. Zeiss 

 obj. D. oc. 2. = 225 diam. 



Fig. 5. Another section from the same, showing rupture of the coelomic epi- 

 thelium due to growth of ovarian cella. Zeiss obj. D. oc. 2. = 225 diam. 



Fig. 6. Section of ccelomic epithelium (p.e) of a young disc-form (tab. 2 no. 5), 

 showing early stages of egg-differentiation. Zeiss obj. F. oc. 2. = 500 diam. 



21* 



