PLATE III. 



Pig. 1. Williamsonia pecien (Vhi[\i-ps). Page 197. [48,732.] 



Fig. 2. WilUamsonia pecten (Phill.). P. 197. [V. 351T.] 



Fig. 3. WilUamsonia pecten (Phill.). P. 197. [V. 3519.] 



Figs. 4 and 5. WilUamsonia pecten (Phill.). P. 198. [39,384.] 



Fig. 6. Williamgonia pecten {VhiW.). P. 200. [39,285.] 



Fig. 7. WilUamsonia pecten (Phill.). P. 200. [13,616.] 



Fig. 8. WilUamsonia pecten (Phill.). P. 201. [V. 3284.] 



