SERPULA. 441 
this species, which Linnzus has not declared his possession of 
in the final list of his ‘Vermes.’ The absence of examples 
from his collection is to be regretted, since they might have 
explained that puzzling expression “ anfractibus supra in- 
trorsum subcanaliculatis,’ which has attracted the attention of 
Fabricius and other naturalists: it is by no means applicable 
to Nautiloides, at least in its ordinary condition. ‘The words 
in the ‘Fauna Suecica’ are those of the ‘Systema,’ and the 
cited drawings are, for the most part, so rude that it is difficult 
to determine what species they were intended for. From this 
stricture Petiver’s engraving, which was clearly designed for 
Nautiloides, as indeed was Ginanni’s in all probability likewise, 
may be excepted: those of Lister and Gualtier might equally 
well have been quoted for the preceding Serpula. In the 
revised’ ‘Systema’ Martini, pl. 8, f. 21, A, B, C, has been 
referred to as illustrative; the last of these three figures was 
copied from Baster (pl. 9, f. 3), and represents a worm; the 
other two have been generally ascribed to S. Nautiloides. Upon 
the whole, then, the synonymy favours the traditional yet 
questionable identification. 
Serpwla triquetra, 
There can be little doubt that Linneeus described a different 
species, by this designation, in each of his three principal publi- 
cations upon conchology ; all these were eventually confounded 
in the synonymy of the twelfth edition of the ‘Systema.’ A 
common British Annelide (Sow. Conch. Man. f. 7), the Vermilia 
triquetra of Lamarck (excluding his variety and his reference to 
Born) has been generally received as the representative of the 
Linnean shell, and upon the whole suits best the Serpula as 
originally characterised in the tenth edition of the ‘Systema,’ 
where almost the sole recognisable figure, that in the ‘ Ephe- 
merides Nature Curiosor, represents that abundant species. 
The Serpula of the ‘Fauna Suecica,’ which was not illustrated 
by any pictorial reference, was, I suspect, the Vermilia (Serpula) 
serrulata of Fleming (Encycl. Edin.—Serp. tricuspidata of Sow. 
Tank. Cat. Appx.—Placostegus crystallinus of Philippi in Wiegm. 
Archiy.), a Boreal species, to which the expressions “ apice 
3.1 
