A. pectunculus. A. lenticularis sulcata, decussatim rugosa.
"Arg. t. 27. f. B," and Lister without numerals appended, were the unpublished synonyms. The expressions "leviter," "exteriore tenui; sulcata," "in arcum," were not parts of the original copy, which contained, however, the unprinted paragraph "latere interiore margine prominente notato." There was no specific name attached to either this or the next species.
A. glycimeris. A. lentiformis, transversim substriata, rima lævi.
The 'Chama glycimeris Bellonii' of Lister (t. 247) was an unprinted synonym.
The following suppressed description of an unnamed Ark that was allied to, if it were not, fusca or barbata, was found in the manuscript. The 'Museum' had been referred to in the synonymy of the latter in the 'Systema,' but the species was not mentioned in the published version.
Arca ovalis, compressiuscula, apicibus subcontiguis.
Testa rudis, ferrugineo-fusca, longitudinaliter striata, striis quasi ex punctis callosis concatenatis, alternis striis majoribus ovatis, parum obliqua, minus lateribus gibba, rotunda absque angulis. Margo æqualis, edentulus. Apices recurvi fere tangunt se invicem. Rima dentibus minutissimis, antice longius extensa, nec recta.
OSTREA.
The very natural genus Pecten was separated from the unsymmetrical oysters, with the following definition:—