510 EDWIN S. GOODRICH. 



Fig. 17. — Plan of the coelom and peritoneal funnels in the posterior seg- 

 ment of Peripatus. 



Fig. 18.— Plan of the coelomic follicles (enteroecels) and developing peri- 

 toneal funnels in an embryo Echinoderm (Asterias). 



Fig. 19. — Plan of a stage in the development of the coelom and peritoneal 

 funnels (pronephric tubules) of an Elasmobranch. 



Fig. 20. — Plan of the coelom and nephridia (pronephridial stage) in an 

 embryo Mollusc. 



Fig. 21. — Plan of the coelom and developing peritoneal funnels (excretory 

 organs of the adult) of a Mollusc. 



Fig. 22. — Farther stage of the same, after the peritoneal funnel has fused 

 with the epidermal invagination. 



Fig. 23. — Plan of a longitudinal section of Balanoglossus, showing the 

 coelomic follicles and peritoneal funnels. 



Fig. 24. — Plan of a longitudinal section of a Nemertine, showing the 

 coelomic follicles and peritoneal funnels before the latter have reached tlie epi- 

 dermis (the nephridia are represented in the same region as the genital follicles). 



Fig. 25. — Plan of a longitudinal section of the nephridia, coelom, and de- 

 veloping peritoneal funnels in a larval Oligochsete. 



Fig. 26. — Similar plan of a larval Polychsete. 



Fig. 27. — Plan of a longitudinal section of the coelom and peritoneal funnels 

 in an embryo Vertebrate. 



Fig. 28. — Plan of a longitudinal section of the coelom, peritoneal funnels, 

 and nephridia of a Leech. 



Fig. 29. — Plan of a longitudinal section of the coelom, &c., of an Oli- 

 gochsete. 



Fig. 30. — Plan of a longitudinal section of the coelom and developing peri- 

 toneal funnels of an embryo Insect. 



Fig. 31. — Plan of coelom and peritoneal funnels (pronephric tubules) of a 

 Vertebrate. 



