TURBO. 347 
representation of it, but that shell (which I take for the 7. at- 
tenuata of Reeve) is not delineated as either smooth or imbri- 
cated. The “anfractibus medio subangulatis suturis coarctatis,” 
in Lamarck’s ‘ Animaux sans Vertébres,’ expresses a very dif- 
ferent sculpture from that indicated by the Linnean language. 
His type, according to Kiener, was a worn variety of duplicata. 
Gurbo acutangulus.' 
A marked specimen (pl. 8, f. 1), which agrees with its descrip- 
tion, and doubtlessly, in the eyes of Linnezus, less critical in 
drawings than are those of the present generation of naturalists, 
with the cited figures likewise, still remains in the collection. 
The quoted engraving of Bonanni, however, represents a shell, 
which, instead of being of the uniform “color cornu” of the de- 
scription, is adorned with longitudinal streaks; that of Gualtier 
is much more nearly correct, but not being a portrait, it has 
been thought advisable to have the type delineated in the pre- 
sent work. 'The specimen is scarcely the T'urritella acutangula 
of Deshayes’s edition of Lamarck, but what we regard as a 
variety of the following species. 
Linnzus appears to have eventually thought so himself, as 
643, in addition to the 642, is inscribed upon the shell, and 
in his manuscript alterations, whilst the other turreted T'ur- 
bines are indicated by references to the tenth edition, this is 
omitted. 
Gurbo Duplicatus. 
From the correctness of the synonymy no discussion has 
arisen as to what shell Linneus intended by this epithet. To 
his own copy of the ‘Systema,’ our author has appended, like- 
wise, “ List. 591, f. 59.—Pet. Gaz. 102, f. 20.” each confirmatory 
of his previous references. His marked specimen, fairly enough 
represented by Chemnitz (Conch. Cab. vol. iv. pl. 151, f. 1414), 
is the Twrritella duplicata of modern writers. 
