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.