442 SPECIES OF THE SYSTEMA. 
tridentato, dente uno superiore recto et duobus inferioribus 
propriori—nutantibus” (F'.8.) are peculiarly appropriate. The 
presence of that semipellucid triple-pronged object in the 
typical collection (where the V. triquetra has also been pre- 
served), and the addition of ‘‘ Testa ore fere tridentali” and 
* Act. Nidros. 4, p. 532, t. 2, f. 14” (an excellent representation 
of it) to the revised ‘Systema’ encourages the idea. The “ fili- 
formis,” “teretiuscula,” ‘‘subcarinata,” of the ‘Museum Ulrice’ 
suit neither of these two: it seems, then, that the species in 
that publication was also distinct. 
Serpwula tutrteata, 
It was not to be expected that naturalists should succeed 
in identifying with certainty and unanimity an unillustrated 
species so meagrely characterised as the one under considera- 
tion. Lamarck and most conchological writers have wholly 
omitted to notice it; Philippi has not determined it in his 
valuable paper on Serpula in Wiegmann’s ‘ Archives’ for 1844 ; 
Montagu and his followers have surmised its identity with 
the Serpula vermicularis or Milleri; Schroter, disregarding its 
Mediterranean locality, fancied that he had detected it in some 
extra-European worm-shells, in illustration of which he has 
referred us to “ Guettard, Mineralog. Belust. pt. 4, pl. 6.” It 
is by no means impossible that the Serpula Miillert (Brit. Mar. 
Conch. fig. 67) was really the species intended, for an example 
of that Annelide seated upon a Mediterranean Pinna (in ac- 
cordance with the stated habitat) may be discerned in the Lin- 
nean collection. Of the Serpule in that cabinet, however, 
and our author has recorded his possession of an example— 
that which best corresponds with the features of the description 
is a Mediterranean worm-shell which I have also dredged at 
Guernsey; it seems to be the S. aspera of Philippi, to which 
the Vermilia scabra of Lamarck (not of Delessert’s figure) has 
been doubtfully referred. It matters little which of the two 
may have been the intricata of Linnzeus, since, from the utter 
inadequacy of the definition, the species scarcely merits to be 
retained. 
