156 SPECIES OF THE SYSTEMA. 
4 (copied by Ledermuller, figure d) has confused another (and 
perhaps two) very distinct species, not provided with a central 
boss. Montagu’s engraving of his Nautilus calcar bears little 
resemblance to any of those mentioned. 
Nautilus crispus. 
In the copy of the ‘ Systema’ that belonged to the younger 
Linné, “ Mart. Syst. t. 20, f. 172—174,” has been added to the 
synonymy. ‘The two first figures were copied from those cited 
in Gualtier ; the last, as well as Ledermuller’s figure b, not 6 
as misprinted, apparently from Plancus. 
Our author, in the tenth edition of the ‘ Systema,’ has indi- 
cated his possession of the species. The specimens wrapped 
up in a paper so marked in his cabinet are identical with those 
delineated and described by Montagu (Test. Brit. p. 187, pl. 18, 
f.5) under the same appellation. Lamarck refers N. crispus, as 
recognised by Fichtel, to the genus Polystomella. 
Pautilus Weecearit. 
The specimens enveloped in a paper thus inscribed in the 
Linnean cabinet are identical with the Nautilus Beccarii per- 
versus of Montagu (Test. Brit. Sup. pl. 18, f. 6), which is re- 
ferred by Fleming and Brown to the genus Rotalia. The dis- 
tinction between the dextral and sinistral forms of Beccarii was 
evidently not considered by the Swedish naturalist of essential 
importance, for he has cited figures of both kinds as illustrative 
of the species. ‘“ Mart. Syst. 261, t. 19, f. 178, 179, and t. 20, 
f. 175—177” has been added in the revised copy of the ‘ Sys- 
tema,’ the two first figures being copied from Ledermuller, the 
three last from the referred-to engravings in Gualtier. 
Ledermuller’s drawings are not original, but only copied from 
Plancus. 
