TAB. VIII. 



Fig. 



1 . Modiola modiolus, page 57. 



a. outside view of var. vulgaris. 



b. inside ditto. 



c. inside ditto, elongated var. 



2. Modiola barbata, p. 58. 



3. Modiola sericea, p. 61. 



4. Modiola phaseolina, p. 59. 



c. inside view of young specimen, showing a crenulated margin. 



5. Modiola discors, p. 60. 



6. Modiola costulata, p. 60. 



a. outside view of elongated var. 



b. inside ditto var. Petagnse. 



7. Modiola marmorata, p. 62. 



8. Modiola rhombea, p. 64. 



Outside view of two varieties. 



9. Mytilus edulis, p. 52. 



a. var. elegans. 



b. ,, antiquorum. 



c. „ incurvatus. 



d. „ saxatilis. 



e. „ alseformis. 



10. Mytilus hesperianus,jo. 55. 



1 1 . Pinna pectinata, p. 50. 



The lines indicate the size of the specimens. 



