LIVING BRACIIIOPODA. 381 



Fig. 4. Brachia of L. lepidula, with cirri removed. 



Fig. 5. Terminal lialf of cirrus of L. lepidula, sliowing pigmentation. 



Figs. and (!</. Cirrus of L. anatinn. 



Fig. 7. IJracliia of small Lingula, species unknown, from Naga.saki, Japan. 



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



Fig. n. Cirrus of 1). Stella. 



Fig. 10. Transverse section of brachium of D. Ininellnsa, made at point marked A, 13, on fig. 2, plate 49. 



Fig. 10ft. Highly magnified view of gland cells from small lirachial .sinus. 



Fig. 10?). Portion of cirrus. 



Figs. 11 and 12. Young T. septenfrionaUs showing cirri prcjjecting beyond border of shell. 



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



Fig. 14 to IS. Heiiiithyrist paiUaced. 

 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 month showing extreme mobility of collar. 

 Fig. 18. A few cirri. 

 Fig. 18a. Portion of cirrn.s highly magnified. 



PLATE 47. 



Details of structure. 

 Fig. 1 to 3. Glottidia pyramidatn. 

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

 products. 



Fig. 2. Longitudinal section in median line. 



Fig. 3. Tran.sver.se .section of right half of pallial region showing gill fold, gill ampullae, etc. 



Fig. 4 to 0. Lingula lepidula. 

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

 Figs, a and 0. Stomach and parts adjoining, showing contracted and extended aftitudi's. 

 Fig. 7. Dorsal view of L. anafina. 



PLATE 48. 

 Details of strnctui'e. 

 Fig. 1. Musculature of G.pyramidata. 

 Fig. 2. Musculature of L. lepidula. 

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

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

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



PLATE 40. 

 Details of structure. 

 Fig. 1 to 0. General anatomy of l)isciui.<<ni lamtiloxa. 

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

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



