56. Cyreiia maritima, Adams. P. 



57. Cyrena mexicana, Sowb. 



58. Cyrena moreauensis, Meek $- 



Hayden. F. 



59. Cyrena nebraskensis, Pr. F. 



60. Cyrena occidentalis, Meek fr 



Hayden. F. 



61. Cyrena olivacea, Cpr. C. A. 



62. Cyrena panamensis, Pr. C. A. 



(*) 



63. Cyrena placens, Hanley. C. A. 



64. Cyrena radiata, Hanleij. C. A. 



65. Cyrena salmacida, Morelet. C. A 



66. Cyrena sordida, Hanley. C. A. 



67. Corbicula convexa, Desk. C. A 



68. Corbicula truncata, Pr. F. 



69. Corbicula ventricosa, Pr M. 



