LIVING BHACHIOPODA. 379 



PLATE 41. 

 Life attitudes of (Jlnttiiliti pi/nintiilutii. 



Fig. 1 to 10. Various attitudes in the sand. 



Fig. 3. With peduncle broken away, burying itself head first in the sand. 



Fig. 11. Anterior portion projecting above the sand with a pile of sand in front. 



Fin. 12. With peduncle broke:] away, burying itself sidewise. 



Fig. 13. Ei;?!it individuals attached to bottom of bowl by rude sand burrows ; compare with similar group of Limjnln 



(40: 11). 



Fig. 14. With case of sand around posterior end of body. 



Figs. 15 and Id. Injured peduncle with inner tubs partially withdrawn from outer sheath. 

 Fig. 17 to 25. Various attitudes, some with sand tube preserved. 



Fig. 26 to 30. Portions of peduncle broken away, with globular masses of sand at end. 

 Fig. 31 to 33. Various attitudes. 



PLATE 42. 



Dorsal and ventral shells of various forms. 

 Figs. 1 and 2. (IhMidia pi/nnnidata, dorsal and ventral shells. 



Fig. 3 to 8. Lingula lepidnla. 



Fig. 3. Ventral view of posterior end showing protegulum and portion of peduncle. 



Fig. 4. Posterior end, ventral view. Arrows indicate direction of circulation. 



Fig. 5. Outlines of shells in life showing extent of individual variation. 



Fig. 0. Appearance of shells when dried. 



Figs. 7 and 8. Posterior end of dorsal and ventral shells. 



Fig. 9 to 13. Jiiscinini'ii lu 

 Fig. 9. Orbicular nucleus. 

 Fig. 9a. Polygonal structure of shell. 

 Fig. 96. Fracture of shell margin. 

 Fig. 10 to 13. Dorsal and ventral shells showing protegulum stage. 



Fig. 14 to 17. Discinixca stella. 



Fig. 14. Portion of ventral shell showing radiating ridges. 



Fig. 15. Greatly enlarged view of two ridges. 



Fig. 1(5. Nucleus of ventral shell. 



Fig. 17. Longitudinal section. (The lower of the two figures should have been lettered 17<(.) 



Fig. 17n. Dorsal view of ventral shell. 



PLATE 43. 



Peduncles of Lingula, Glottidia, Discinisca, and Terebratulina. 

 Fig. 1 to 3. Linyula lepidnla, showing severed ends of peduncle. 



Fig. 4 to 13. Glottidia pyrtimitlata. 



Fig. 4. Showing withdrawal of inner tube and muscular tube from end of outer sheath. 

 Fig. 5. Portion of peduncle. 



