14^ C. magnum. sp. 3. 



a. C — Var. Sp. 2* 



b. . — Var. y. sp. 3. 

 47 C flavum sp. 3, 



43 C. leevigatum. sp. i. magn. 3. mliVo 



49 C. serratum. sp. unic. 



a. C — Var. min. sp. unic. 



50 C. edule* sp, unic. magn. 

 a. C» — Var. min. sp. 3. 



51 C. iblnndicum. sp. unic. 



52 C. groenlandicum. sp. 3. 



53 g^^^^cura? sp. 2, 



54 C. Xima. sp. 2. 



55 C. riijgens. sp, unic. 



56 C. seoUcum. sp. unic. pulcherr» 



57 C. oblongum. sp. unic. 



58 C. crassum, sp. 2. 



a. C. — Var. flava. Testa profunde 

 sulcata, antice sulcis dentatis, postice 

 imbricatiro transverserugosis, E Tran- 

 quebaria. sp. 2. 



59 C. latum. sp. unic, 



Mactra. 



60 M. Spenglerj. sp. tinic. integr. 



