386 EDWARD S. MORSE ON LIVING BRACHIOPODA. 



Fig. 10. So-called heart. 



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



Figs. 12 and 1.3. Different views of genital gland. 



PLATE 60. 



External glands of Terebratulina septentrtonalis. 



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

 of external glands to nephridial openings. 



Fig. 2. Another view of nephridia 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 spiculae 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. 9. Another view of nephridium surrounded by lobules of external gland. 



Figs. 10 and 11. External glands. 



Fig. 12. Ventral view of anterior wall of coelomio 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. 



PLATE 61. 

 Early stages of various forms. 



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



Figs. 2, 3, and 4. Disciniisca Stella. 



Fig. 5 to 12. D. lamellosa. 



Fig. 13 to 16. Various stages of 2\ septentrionalis, reproduced from the author's memoir on early stages of this species. 



Fig. 17. Hemithyris psittacea. The natural size is indicated by the small outline. 



Printed, July, 1902. 



