Chapter D: ENTALIS. D. subulato-cylindricum, subarcuatum

The terminal details were not furnished.

_D. dentalium_ was the intended appellation.

SERPULA.

In the original version of the 'Museum Ulricæ,' the members of this genus are not separated from the _Dentalia_ (a proof, among many others, of the early date of this catalogue). Linnæus, however, when revising the transcript, had meditated the withdrawing of _S. arenaria_ and _lumbricalis_, and constituted for them a nameless genus with the following definition:--

Testa tubulosa, isthmis concamerata, dissepimentis integris, nec perforatis, s. communicantibus.

This genus would have been the equivalent of the modern _Vermetus_.

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 gigas_ was probably intended by the following unpublished description.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 The prickly variety was the unpublished type, and was thus defined:--