The printed synonyms are additions. From the "crassa," and the "absque
denticulo," it is by no means improbable that some large exotic species
was intended. The proposed name was _niger_; and that word originally
formed part of the heading, but had been erased by Linnæus.
M. UNGULATUS. _M._ læviusculus, valvis obliquis postice dilatatis,
antice apice.
"Lineis" was "tunicis" in the original. I do not consider that the
details of this species (the _M. rusticus_ of the MS.) pertain, even
generically, to the _ungulatus_ of the 'Systema.'
The large _Mytilus_ represented by Gualtieri was not quoted: the
reference, on the contrary, was to the two _Modiolæ_ depicted by
Rumphius ("Rump. 151. t. 46. f. B. C.") and to their Kleinian names
("Klein, 127. Musculus acutus vulgaris, a. b."); and to that genus,
rather than to _Mytilus_, does the account of the suture, and the final
remark, apply.