Testa subrotunda, obtusa. Labium interius planum, transversim
truncatum, depressum.
The generic arrangement was similar to that of the printed version.
N. CANRENA. _N._ edentula umbilicata, spira mucronata, labio reflexo
bifido.
When Linnæus first described this shell, under the appellation of
_N. musica_, he did not admit a single one of the cited figures as
illustrative.
N. GLAUCINA. _N._ edentula convexa, umbilico simplici semiclauso
gibboso dicolore.
None of the deceptive figures were at first referred to, but had been
added at subsequent period; and that of Rumphius again erased. _N.
luteola_ was the intended name.
N. ALBUMEN. _N._ edentula subrotunda, umbilico teretinsculo.
The present heading agrees with the subsequent details, which could
not be affirmed of the printed one borrowed from the 'Systema.' The
MS., in some degree, clears up the extraordinary confusion in which
the Linnean species was enveloped. There were two _N. albumens_ in
the written copy. The shell here described (assuredly not the lobed
_albumen_ of the 'Systema') was originally termed _hepatica_ or
_luteola_ (for both had been erased). The true _albumen_ was described
as "edentula subrotunda, umbilico subcordato labri interioris lobo
explanato" and the only figure referred to was "Rumph. t. 22. f. B."
"Klein 13. Platystoma vitellum compressum" was also mentioned. This
description was suppressed, and the other species retained, with the
erroneous designation, and the faulty synonymy, attached. Nor was this
the only change. In order to include the _Natica vitellus_ of authors
("Rumph. t. 22. f. A. Valvata lævis prima s. vitellus" had been quoted
by our author) the "aut lutea", "aut maculis albis", had been added to
the earlier description: so, likewise, had been "Apertura rotundata,
semicordata", and "glabrum, planiusculum, nitidum." I suspect, then,
that whilst the ideal of the _albumen_ of the 'Systema' was any
hemispherical or flattened _Natica_ with a labial lobe (such as _Nat.
albumen_, _didyma_, _olla_, _&c._), the _albumen_ of the 'Museum', as
printed, was composed of _Natica rufa_ ("Rumph. 22. f. D." was quoted
in the MS.) and _vitellus_ (for A, not B, of Rumphius was the letter
indicated in the MS.).
N. MAMMILLA. The entire account of this common shell was added in the
Linnean handwriting. The inappropriate "aut lutea" was not at first
present.
N. CORONA. _N._ edentula, simplici spira spinosa.
"Pet. Amb. t. 3. f. 4.", a mere copy of the Rumphian figure, was also
quoted. The 19 in the reference to d'Argenville was a misprint for the
written 10. _N. spinosa_ was the intended designation.
N. RADULA. _N._ edentula sulcata, tuberculis æqualibus.
The valvata granulata of Rumphius (t. 22. f. M.) was referred to at
illustrative.
N. CORNEA. _N._ edentula, obsolete striata.