440 SPECIES OF THE SYSTEMA. 
evident that our author once possessed examples of it, he has 
not recorded the presence of it in his cabinet. The Ver- 
miculum intortum of Montagu, now generally classed with the 
Foraminifera, is usually regarded as the representative of the 
species. 
Serpula planordis. 
It is clear from the description of this object, which, Dillwyn 
remarks, has not been subsequently noticed by any conchologist, 
that it was neither the shell of a mollusk nor of an Annelide ; 
indeed, there is no certainty that it even belonged to the Fora- 
minifera, although, from its position next to seminulwm, one 
might have surmised such a parentage. Some Orbitolites (corals) 
are the only objects in the collection of Linnzus which at all 
approach the recorded features. 
Serpwla sptvillun. 
The Spirorbis spirillum of British writers (well described by 
Montagu as a Serpula) is now usually received as the Linnean 
species. Both the rude drawings quoted by our author were 
apparently designed for that abundant Annelide. Ginanni, in 
his rude sketches of this and Nautiloides, has fairly enough 
contrasted the general differential character of these allied con- 
geners; Plancus, whose figures were badly copied by Martini 
(Conch. pl. 3, f. 20, c, p), exhibits the two surfaces of an imper- 
fectly coiled specimen. Some uncharacteristic examples are 
still preserved in the Linnean cabinet, and alone bear any 
resemblance to the definition. ‘The account in the ‘Fauna 
Suecica’ agrees, word for word, with the diagnosis and synonyms 
in the final edition of the ‘ Systema.’ 
Serpula sptrvorbts. 
The Spirorbis Nautiloides of authors (Wood, Ind. Testac. pl. 38, 
Serp. f. 8) has been generally recognised as the representative of 
