The number which indicates the position of this species in the 'Museum' has been subsequently ('Syst.' ed. 12) referred to _V. cancellata_, yet, judging from the generic appellation (and consequent dentition), it could scarcely have been that well-known species. The "lentiformi" of the 'Systema' (ed. 10), where the name _ziczac_ first appeared, forbids the annexation; but, although the details of the 'Museum' were there referred to, the obnoxious word was not mentioned in that publication. The following are the printed emendations (?): "lævis, et quasi excisa," "compressa," "variat colore albissimo." V. PECTINATA. _Pho._ sulcis longitudinalibus nodosis, antice antrorsum ramosa. The additional synonym of "Gualt, D. 75, f. A." appears in the MS., where "quam reliquæ" follows "orbiculata," and in place of "In area antica" may be read "et a primo sulco." The details there terminate with the word "lanceolatum," "_Ramosa_" was the intended name. V. SCRIPTA. _Pho._ striata, postice angulo recto circumscripta. The incorrect figure of d'Argenville was not indicated. V. EDENTULA. _Pho._ subgloboso-lenticulata rugosa edentula. V. LITERATA. _Cha._ transversim striato-ovata. The earlier reading of confertim was "profunde"; "striis crenulatis antice et postice," "lanceolata," and "tres s." were absent. V. ROTUNDATA. _Cha._ transversim striata ovata absque angulo. The printed additions are "varius in variis," "aut albis," "lanceolata," and the final remark. There was no name attached in the MS. 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 Phryne_ of the 'Systema' was designed by the following unpublished description:-- CUN.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.