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unpublished synonyms.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.