218 SPECIES OF THE SYSTEMS. 
corroborated by the presence in the Linnean cabinet of certain 
perforated individuals of that kind (Kiener, Coq. Viv. Margin. 
pl. 6, f. 23), which had formed part of a necklace, brace- 
let, or some other female ornament composed of strung shells. 
As these examples alone of the entire collection adequately agree 
with the description, and the presence of the species in his col- 
lection has been recorded by Linnus, no doubt can be reason- 
ably entertained of the typical authority of the specimens. 
Voluta Persicula. 
Both the Marginella Persicula and lineata of authors (Encye. 
Méth. Vers, pl. 377, f. 8, and var. f. 4) are still preserved 
in the Linnean cabinet, and of the shells there present alone 
agree with the definition ; they represent severally the varieties 
a and b of the ‘Systema.’ The published synonymy is correct, 
provided we include, as suggested by Sowerby, the M. avellana 
of Lamarck (Gualt. pl. 28, f. E) in Persicula proper. 
Voluta pallida. 
Both in the twelfth edition of the ‘Systema’ and in the 
‘Museum Ulric’ the characters of this shell experience a 
remarkable change. When it originally appeared (as a Bulla) 
its shape was termed cylindrical, afterwards in the ‘Museum’ 
ovate-cylindric, finally (as a Volute) ovate-oblong. The Bulla 
was at first described, moreover, as “livida, longitudinaliter 
sriseo undulata,” and no mention was made of columellar folds : 
in the ‘Museum Ulrice’ the colouring was declared to be 
‘“‘incarnata—pallida, sepe variegata,” and the pillar to be 
“ quadriplicata.” In sooth, almost the only characteristic 
common to the species of the tenth and twelfth editions of the 
‘Systema’ is the “spira elevata.” I suspect, then, that our 
author erroneously considered the Bulla pallida to be an im- 
mature specimen or varietal dwarf form of his after-established 
Voluta pallida. Itis not even improbable that the ovate-oblong 
shell of the twelfth edition, where the synonymy first appeared, 
