386 EDWARD S. MORSE ON LIVING BRACIIIOPODA. 



Fig. 10. So-called heart. 



Fig. 11. Another view of same organ slightly compressed. 



Figs. 12 and 1:1. Different views of genital gland. 



PLATK lilt. 



External glands of Terebratulimi septeiitrionnlis. 



Fig. 1. Shells thrown widely apart rupturing anterior coeloniic wall, showing brachia, position of nephridia and relation 

 of external glands to nephridial openings. 



Fig. 2. .Another view of uephridia with external glands. 



Fig. 3. External gland compressed with glandular particles forced out. 



Fig. 4. Greatly enlarged view of lobule of external gland showing ciliated epithelium. 



Fig. 5. External gland showing spioulae on surface. 



Fig. 6. Nephridia with external glands surrounding their terminations. 



Fig. 7. Greatly enlarged view of right nephridial tube with external gland. 



Fig. 8. Tubular portion of nephridia ensheathed by external gland. 



Fig. !t. Another view of nephridium surrounded by lobules of external gland. 



Figs. 10 and 11. External glands. 



Fig. 12. Ventral view of anterior wall of eoelomic cavity showing prominent character of external glands with azygos 

 process between. 



Fig. 13. Longitudinal section of T. septentrionalis, showing position of external glands projecting into pallial cavity. 



PLATK (il. 

 Early stages of various forms. 



Fig. 1. Lingula, species unknown, from Nagasaki. 



Figs. 2, 3, and 4. Diwinixi'it xtcllu. 



Fig. 5 to 12. 1). Idint'lliixii. 



Fig. 13 to Hi. Various stages of T. septe.ntrionalis, reproduced from the author's memoir on early stages of this species. 



Fig. 17. Hemithyris pititttici'u. The natural size is indicated by the small outline. 



Print, d, July. 1 :>".'. 



