The original description has been somewhat enlarged in the press, by the addition of "brevissimis," "et extrorsum flexis," "fossula distinctus; at vero ille sub anno quasi duplex"; "minus vero ad latera sulcata," moreover, was simply "ad alterum latus": the only expression omitted in printing was "reflexus," which followed "Anus margine."
C. Cardissa. Buc. compressum, valvis carinatis, natibus contiguis.
"Colum. Aqu. 19. t. 16" (cited also in the 'Systema') was quoted in the MS. from which the "vix," "subcontigui," "remotus, validus, fossula distinctus," were absent. The "Rima" was termed "subrotunda" instead of "cordata."
C. hemicardium. Buc. subquadrilaterum: valvulis carinatis, umbonibus distantibus.
"Fasciis" was a misprint for the original "facies": "sulcis convexis" was written "sulcis excavato-rugosis." There was no specific appellation.
C. medium. Buc. subcordatum subangulatum; valvulis angulatis sulcatis lævibus.
The prefatory remarks were the only portion of the printed description to be found in the MS. The species was not named, but was quoted in the 'Systema' before the publication of its details.
C. aculeatum (misprinted "muricatum"). Buc. subcordatum, sulcis convexis, linea cava exaratis, versus apicem dentatis.
The intended name was verum.
C. echinatum. Buc. subcordatum, sulcis acutis exaratis linea elevata ciliata aculeis inflexis plurimis.