This very natural genus was confused with _Chama_, and thus
characterized:--
Testa imbricata. Cardo e callo gibbo oblique inserto fossula obliqua.
* * * * *
S. GÆDEROPUS. _S._ imbricatus auritus, cardine dentato.
"Rumph. t. 48. f. 1," "Gualt. t. 99. f. E. F. G," "Bonan. 2. f. 21,"
"Rondel. c. 40. p. 41," were the additional synonyms of the MS. The "ad
cardinem truncata" was an emendation for the previous "breviore": the
"superiore" a misprint for the written "inferiore": the final remark was
not present.
S. REGIUS. _S._ spinosus sulcatus inauritus cardine dentato.
No name was attached to this species: the previous one had been termed
_Pectinites_.
S. PLICATUS. Not mentioned in the manuscript.