The details attached to the published synonyms (which latter belonged to the _C. terebellum_ of the 'Systema,' and to which were joined "Gualt. t. 23. f. O.--"Bonan. 3. f. 57.--Pet. Amb. t. 13. f. 24,") ran as follows: "Testa cylindracea, glabra, antice angustior, desinens in spiram attenuatam, anfractibus 3. Basis truncata, tennis. Columella non torta, sed involuta. Color pallidus." CYPREA. Testa ovata lævis involuta. Apertura linearis, utrinque dentata. Spira occultata intra testam. C. MAPPA. _C._ subturbinata characterisata, macula longitudinali dentata. "Pet. Amb. t. 16. f. 2." was an omitted synonym. The terminal remark is an improvement upon the earlier "Noscitur linea utrinque dentata in superficie scripta." C. ARABICA. _C._ subturbinata characterisata, macula longitudinali simplici. "Denticulis testaceis" and the description of the variety were additions by the hand of Linnæus. C. ARGUS. _C._ subturbinata subcylindrica, maculis annularibus. The synonyms of Petiver (t. 97. f. 6) and Bonanni (f. 263), quoted in the 'Systema,' were also present in the MS., where "2. s. 1" was in the place of "duabus." The "pallidis" was a misprint for the written "pallidæ." The account of the variety was subsequent to the copy. C. TESTUDINARIA. _C._ obtusa cylindrica, extremitatibus depressis. "Pet. Amb. t. 8. f. 7." was an unprinted synonym. C. CARNEOLA. _C._ subturbinata pallida, fasciis incarnatis. C. TALPA. _C._ subturbinata violacea, fasciis pallidis. "Pet. Amb. t. 16. f. 1." was an unprinted synonym: "pallide flavescens" was the earlier reading for "testacea." The final remark was not in the copy. C. AMETHYSTEA. _C._ subturbinata, dorso violaceo. Rumphius was not originally cited as illustrative. C. VANELLI. _C._ subturbinata, maculata punctis lutescentibus. "Obsoletis" was originally in the place of "acutis": the "sæpe lutescentibus" was an addition of the press. _C. Ovum Vanelli_ was the intended designation. C. LOTA. _C._ subturbinata alba, denticulis subulatis. C. FRAGILIS. _C._ subturbinata gibba fragilis, obsolete fasciata. Linnæus himself inserted this heading, with the first three lines of the printed details, in the manuscript copy. Neither the reference, nor the longer account of the variety (evidently a different species) appeared there. C. CAPUT-SERPENTIS. _C._ obtusa triquetro-gibba, postice obtusiuscula. "Fusis" was the earlier reading for "confertis." C. MAURITIANA. _C._ obtusa triquetro-gibba, postice depresso-acuta. "Pet. Gaz. t. 96. f. 8. ex Insula Mauritii" was added in the manuscript: "fuscus" was the earlier version of "fusco-testaceus." C. VITELLUS. _C._ subturbinata livida, maculis albis. The published reference was substituted for "Bonan. 3. f. 254," a more characteristic figure: "maxima ex parte distincta, sed" followed "Spira." "Albida," not "alba," was the tint at first ascribed to the base. C. MUS. _C._ obtusa subovalis gibba cinerea, fascia longitudinali fusca.