232 BUNTING. 
EXPLANATION OF PLATE I. 
[Figs. 1-20 (with exception of 7 and 17) X 372; 7 X 187; 17,21 X 94. 1,2 
Stain, Picro carmine; 3-21 Stain, Haemotoxylin.] 
Fic. 1. Longitudinal section through wall of a young blastostyle before 
formation of gonophore. Ova, ov, in the endoderm; older ovum towards mouth 
pole; ova not directly upon supporting lamella. Stain, Picro carmine. 
Fic. 2. Longitudinal section through mouth region of a young blastostyle 
before formation of gonophore. Ovum, ov, in endoderm of the tentacles. Stain, 
Picro carmine. 
Fic. 3. Longitudinal section of young female gonophore bud. Breaking 
down of supporting lamella. 
Fic. 4. Longitudinal section of older female gonophore. Ova in endoderm. 
Bell nucleus consisting of a few cells at distal portion. 
Fic. 5. Longitudinal section of adult female gonophore. Ova situated 
between the endoderm and inner layer of bell nucleus. Bell nucleus consisting of 
two layers of ectoderm. 
Fic. 6. Longitudinal section of distal portion of adult female gonophore, 
showing a union of the ectoderm and endoderm. 
Fic. 7. Longitudinal section of adult female gonophore. Spermatozoa, sf, 
on one side of spadix, 6; ovum, ov, upon opposite side. 
Fic. 8. Longitudinal section of young male gonophore bud. Two cells in 
ectoderm, a, 4, with more granular protoplasm. 
Fic. 9. Next section in same series ; a, é, granular cells. 
Fic. 10. Longitudinal section of older male gonophore. Bell nucleus consist- 
ing of two layers. 
Fic. 11. Longitudinal section of still older male gonophore, with spermato- 
blasts, sf, situated between the endoderm and outer layer of bell nucleus. Sper- 
matoblasts developed from inner layer of bell nucleus. 
Fic.12. Longitudinal section of still older male gonophore. Sexual cells 
further developed. 
Fic. 13. Longitudinal section of adult male gonophore. Spermatozoa, sf, 
fully developed. 
PODOCORYNE. 
Fic. 14. Longitudinal section of young female medusa-sud of Podocoryne. 
Ova in endoderm. ‘ 
Fic.1s. Longitudinal section of a portion of an older medusa-bud, solid 
plug of ectoderm, 47. 
Fic. 16. Longitudinal section of manubrium of female medusa, ovum in 
endoderm ; ova passing from endoderm into ectoderm ; ova in ectoderm. 
Fic. 17. Outline of female medusa to show orientation of manubrium in 
Fig. 16. 
Fic. 18. Longitudinal section of proximal portion of wall of medusa-bud, 
ovum in ectoderm. 
Fic. 19. Longitudinal section of young male medusa-bud. Many nuclei in 
distal portion of both ectoderm and endoderm. 
Fic. 20. Longitudinal section of portion of manubrium of male medusa, 
spermatoblasts, sf. 
Fic. 21. Outline drawing of male medusa to show orientation of manubrium 
in Fig. 20. 
