The I of the reference to Rumphius was a misprint for the written 1. A drawing of Gualtieri (t. 64. f. O), which accords not with the description of this species, was an additional synonym. The name had been added subsequently. _Turbo cidaris_ agrees in most respects. T. PETHOLATUS. _T._ exumbilicatus ovatus lævis, anfractibus sursum obsolete angulatis. The written version furnishes us with the additional synonyms of "Gualt. t. 64. f. F.", and "Klein 40. t. 2. f. 51."; the latter (also cited in the 'Systema') was added by our author when he admitted the at first excluded 5. 6 of the synonym of Rumphius. The admission of the rounded-whorled variety? was evidently an afterthought. T. CHRYSOSTOMUS. _T._ exumbilicatus subovatus rugosus striatus, spinis fornicatis. "Klein 41. t. 7. f. 126" (cited in the 'Systema'), and the printed "in superiore serie majoribus", had been added by Linnæus in the original account. T. TECTUM-PERSICUM. _T._ exumbilicatus subovatus, spinis obtusis reflexis, subtus papillosus. "Forte sola varietas sequentis a loco" has been remarked by our author, who did not admit in his MS. the deceptive figure of d'Argenville. T. PAGODUS. _T._ exumbilicatus conicus spinis obtusis concatenatis, subtus papillose striatus. Neither "acuminata", nor the inappropriate "rotundata", were in the original account of this well-known species. T. CALCAR. _T._ exumbilicatus depressus, anfractibus supra spinis fornicato-compressis scabris. To his printed synonyms Linnæus has added "Gualt. t. 65. f. N. P.", "List. Hist. t. 608. f. 46", and "Klein t. 1. f. 27". The "fornicatis" was an emendation. T. MARMORATUS. _T._ exumbilicatus subovatus nodosus lævis. T. PICA. _T._ umbilicatus lævis conicus denticulo umbilicali. "Habitat in Barbados, Jamaica", which corrects the stated locality of the 'Systema,' and "Bonan. 29, 30", "Pet. Gaz. t. 70 f. 9", were the additional particulars of the manuscript copy. T. ARGYROSTOMUS. _T._ umbilicatus subovatus, striatus lineis dorsalibus. The erroneous references to Gualtieri and d'Argenville, were not present: "os argenteum variegatum" was written after the reference to Rumphius, which name belongs to figure 3, not to 4, whose colouring, moreover, excludes it from being illustrative. The intended specific name was "os variegatum." T. MARGARITACEUS. _T._ exumbilicatus subovatus, (? angulo) dorsali elevato, ore postice diducto. Rumphius was not referred to in the original, where "subtilissimis" was in the place of "variis": the printed "margine albo" was a subsequent emendation. T. DELPHINUS. _T._ umbilicatus depressus hispidus, spinis ramosis. "Pet. Amb. t. 3. f. 1", and "Grew Mus. t. 11. f. 5, 6", were also cited. T. DISTORTUS. _T._ umbilicatus muricatus undique spinulis brevibus. The final remark was not in the original. T. SCALARIS. _T._ cancellatus conicus, anfractibus distantibus.