56. Cyreiia maritima, Adams. P. 



57. Cyrena mexicana, Sowb. 



58. Cyrena moreauensis, Meek 8f 



Hayden. P. 



59. Cyrena nebraskensis, Pr. P. 



60. Cyrena occidentalis, Meek fr 



Hayden. P. 



61. Cyrena olivacea, Cpr. C. A. 



62. Cyrena panamensis, Pr. C. A. 



(3) 



63. Cyrena placens, Hanley, C. A. 



64. Cyrena radiata, Hanley. C. A. 



65. Cyrena salmacida, Morelet. C. A 



66. Cyrena sordida, Hanley. C. A. 



67. Corbicula convexa, Desh. C. A 



68. Corbicula truncata, Pr. P. 



69. Corbicula ventricosa, Pr M. 



