LIVING BKACHIOPODA. 381 



Fig. 4. Bi-aohia of X. lepidula, with cirri removed. 



Fig. 5. Terminal half of cirrus of L. lepidula, showing pigmentation. 



Figs. 6 and 6a. Cirrus of X. anatina. 



Fig. 7. Brachia of small Lingula, species unknown, from Nagasaki, Japan. 



Fig. 8. Anterior end from ventral side of above species showing notches in ventral shell. 



Fig. 9. Cirrus of D. Stella. 



Fig. 10. Transverse section of braohium of D. lamelloaa, made at point marked A, B, on fig. 2, plate 49. 



Fig. 10a. Highly magnified view of gland cells from small brachial sinus. 



Fig. 106. Portion of cirrus. 



Figs. 11 and 12. Young T. septentrionalis showing cirri projecting beyond border of shell. 



Fig. 13. Anterior view of T, coreanica, showing brachia. 



Fig. 14 to 18. Hemithyris psittacea. 

 Fig. 14. Brachial coils projecting. 

 Fig. 15. One brachium greatly extended. 

 Fig. 16. Brachia slightly uncoiled. 



Fig. 17. Portion of brachia with surrounding parts from median line. 

 Fig. 17a. Portion of brachium near mouth showing extreme mobility of collar. 

 Fig. 18. A few cirri. 

 Fig. 18a. Portion of cirrus highly magnified. 



PLATE 47. 



Details of structure. 

 Fig. 1 to 3. Glottidia pyramidata. 

 Fig. 1. Dorsal shell removed exposing coelomic cavity, from which have been taken the stomachal glands and genital 

 products. 



Fig. 2. Longitudinal section in median line. 



Fig. 3. Transverse section of right half of pallial region showing gill fold, gill ampullae, etc. 



Fig. 4 to 6. Lingula lepidula. 

 Fig. 4. Brachia with anterior part of alimentary tract showing pharyngeal glands. 

 Figs. 5 and 6. Stomach and parts adjoining, showing contracted and extended attitudes. 

 Fig. 7. Dorsal view of X. anatina. 



PLATE 48. 

 Details of structure. 

 Fig. 1. Musculature of G. pyramidata. 

 Fig. 2. Musculature of X. lepidula. 

 Fig. 3. Posterior portion of body of G. pyramidata. 

 Fig. 4. Anatomy of X. lepidula from ventral side. 

 Fig. 5 to 8. Details of anatomy of X. lepidula. 



PLATE 49. 

 Details of structure. 

 Fig. 1 to 6. General anatomy of Discinisca lamellosa. 



Fig. 1. Dorsal shell and most of the genital products removed. 

 Fig. 2. General view showing pallial sinuses, lacunae, etc. 



