S. TRIQUETRA. _D._ triquetrum, adhærens. The reference to Gualtieri (whose figure was somewhat uncertain, yet probably designed for _Vermilia triquetra_) was queried. The proposed name was _D. parasiticum_. S. CONTORTUPLICATA. _D._ teretiusculum, depressum, rugosum. There was at first no name to the description of this shell; but it was added in the handwriting of Linnæus. S. GLOMERATA. _D._ teres glomeratum. The 'decussato-rugosa' of the 'Systema', applicable to the _'Vermetus subcancellatus_', the shell designed in that work, was not inserted. Gualtieri's figure is that of _Vermetus glomeratus_, for the colouring of which 'alba' would be a most inappropriate term. S. LUMBRICALIS. _D._ spira divaricata teretiusculum, integrum. D'Arg. t. 29. f. 1. was an additional synonym. S. ARENARIA. _D._ teres rectiusculum intestiniforme. Despite the name borrowed from Rumphius, the _Vermetus gigas_ was the object defined in the tenth edition of the 'Systema'. The absence from the manuscript of the reference to Gualtieri's drawing of that shell, and "rectiusculum" in the written diagnosis, confirms the conclusion previously arrived at, that the _Septaria arenaria_ of authors was the species intended in the 'Museum Ulricæ': it was subsequently termed _S. polythalamia_ by Linnæus. The delusive "subangulata" of the supposititious diagnosis was of course absent. The _V. gigas_ was probably intended by the following unpublished description. D. INTESTINIFORME. _D._ teres flexuosum intestiniforme. Testa rudis crassitie digiti et ultro, flexuosa vario modo in diversis, integra, intus lævis. S. ANGUINA. The two very dissimilar _Siliquariæ_ united under this appellation in the 'Museum Ulricæ,' were originally held distinct. The prickly variety was the unpublished type, and was thus defined:-- D. ANGUINUM. _D._ spira inæquali angulata aculeata, sulco longitudinali perforata. Rumph. 125. t. 41. f. H. Solen anguinus. Lang. Test. 6. Tubulus vermicularis crista dentata. Testa albida, teretiuscula, angulis 9 obsoletis. Anfractus inæquales, nunc confertiores, nunc remotiores. Sulcus longitudinalis in superiore latere perforatus serie punctorum. Spinæ breves, fornicatæ ad angulos in latere inferiore. Condensation, that peculiar faculty of the mental organization of Linnæus, induced him to suppress this description, and attach the species, as a variety, to the form he had simultaneously characterized as _D._ spira elongata, teretiusculum, inerme, fissura longitudinali. Gualt. test. 10. f. z. To this latter the published details belong, except the expression "passim concatenata et quasi poris pertusa" (which was a subsequent and fallacious addition), and the account of the variety. S. PENIS. _D._ teres, extremitate radiata disco cylindris poroso.