246 CARDIUM. 



His varieties of C. acuJeatum are not to be trusted ; var. 

 £ is our C. ventricosum. C. ciliatum, p. 3248, is the same 

 as C. echinatum. C. virgineum is a doubtful species, as 

 described by Linnaeus ; and Gmelin has completely con- 

 fused it, by referring to the C. apertum of Chemnitz, 6. 

 pi. 18. f. 181. for a variety of the shell. C. trilaterum of 

 Gmelin, p. 3253, is not specific. His C. triste is omitted, 

 as doubtful ; it is not in the last edition of the Sy sterna 

 Natures. C. crassum, p. 3254, is probably a variety of 

 C. oblongum. C. maculatum, p. 3255, is our C. ventri- 

 cosum. His C. fluviatile is the C. Icevigatum. C. JBa- 

 siliense is doubtful. C. Gaditanum and C. Amboinense 

 belong to the genus Area. C. squamosum, p. 3256, is a 

 young shell of the 0. Isocardia. C. fasciatum is a va- 

 riety only of C. rusticum. 



END OF THE FIRST VOLUME. 



