Chapter V: DECUSSATA. Cha. testa ovata, decussatim striata

"Sæpe" and "minimus" are the sole printed additions.

* * * * *

Probably the _V. Phryne_ of the 'Systema' was designed by the following unpublished description:--

CUN. VENOSUS. C. subcordatus lævis lateribus rugosis. Testa cinerea, nuce coryli major, gibba, glabra, antice et postice transversim sulcata. Margo exterius tantum denticulatus, non vero apex externus, aut margines laterales.

The _V. macrodon_ answers fairly enough to this definition.

SPONDYLUS.

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.

CHAMA.

The members of this genus were included in _Spondylus_, except _cordiformis_, which was referred to BUCARDIUM.

C. GIGAS. _Sp._ plicatus squamosus, ano hiante crenato.

The species as originally defined was more comprehensive in its details than when printed; for the restricting "decussatim" had not been added, and "Gualt. t. 93. f. B." was an additional synonym. The printed additions were "obsoletis," "Margine reflexo," "exteriore duplicato longiore," and the final remark. _S. imbricatus_ was the intended name.

C. HIPPOPUS. _Sp._ plicatus muricatus, ano retuso clauso dentato.

"Arg. t. 26. f. H." was an additional synonym of the MS.: the printed 20 should have been 10, as written: "ut in præcedente" was an emendation: _S. asper_ was the proposed name.

C. LAZARUS. _Sp._ imbricatus.

Seba was not cited: "obliquam" followed "fossam" in the MS. "Elevatis," "longitudine testæ," "productiore," "instar auris" formed no portion of the early description.

C. ANTIQUATA. _Sp._ subcordatus, sulcis perpendicularibus transversim striatis.

No name was attached to the original details, which appear to have been altered ("in aliis minimum cordatum impressum fuscum"), and the synonym of Bonanni added, in order to comprise that species (_Cardita sulcata_) which had been pictorially defined in the 'Systema.' "Gibba" was preceded by "admodum": "obsoletis" was not present. _Cardita bicolor, var. unicolor_ was probably intended.

C. SEMIORBICULATA. _Sp._ semiorbiculatus compressus, decussate striatus, rudis.

"Interior" was the earlier reading of "primarius."

C. CORDATA. _Sp._ cordatus, transversim striatus, hinc elongatus, compressus.

C. OBLONGA. _Sp._ oblongus, antice angulatus, dentibus anticis acutis.

"Unico" (error for "unicus") originally preceded "in altera valvula."