The 'Museum' was referred to for this shell previously to the
publication of the details. Curious to relate, the species was wholly
omitted in the twelfth edition of the 'Systema.' It was, in all
probability, a _Mactra_, which genus had not been constituted at the
period when the description of _C. triste_ was issued.
C. PECTINATUM. _Buc._ subcordatum, striis hinc longitudinalibus, illine
transversalibus.
The erroneous reference to Gualtieri was not present in the written
copy.
* * * * *
Mention was made in the 'Systema' of a _Solen bullatus_, for a more
detailed account of which the reader was referred to the 'Museum
Ulricæ.' No such species appeared in the published edition; but the
omitted shell (a veritable _Cardium_) was thus described in the
unprinted version:--
BUC. BULLATUM. _B._ subrotundum, antice crenato-hians.
Rump. 143. t. 44. f. N. Pecten bullatus.
Testa subrotunda, inflata, gibba, fragilis, pellucida, substriata,
rufo nebulosa, antice hians, margine serrato. Umbones tumidi, obtusi,
reflexi. Rima minima brevissima. Ani regio obsoleta. Dens cardinis fere
unicus, minimus. Marginales solitarii, remoti, compressi, majores.