260 SPECIES OF THE SYSTEMA. 
the erroneous reference probably resulted from the hastiness of 
the glance bestowed upon the numerals by Linnzus, since the — 
figure adjacent to and next after 34 represents, indeed, T'erebra 
crenulata, but is marked 9, not 35. The other delineations 
referred to (the only ones, quoted in the earlier edition, and in 
the ‘Museum Ulrice’), although somewhat rude, exhibit a 
Terebra whose characters coincide with those ascribed to the 
shell, and hence pictorially define the species. The 7’. crenulata 
of authors (List. Hist. Conch. pl. 846, f. 75) is still preserved in 
the Linnean collection, and alone agrees with the definition of 
this shell. 
Brucetnun Heettewnt, 
Unfortunately Linnzus did not himself possess this most 
puzzling shell, which has generally baffled the endeavours of 
naturalists to identify it: hence Chemnitz was deceived, when 
he flattered himself that he had determined it, by the aid of the 
Linnean collection, which was at that time in the possession of 
Sir J. Smith; the shell delineated by him agrees with the sup- 
posed pale variety of Ter. dimidiata figured in Hind’s Mono- 
graph of the genus, but bears not the least likeness to the 
engravings cited in illustration of B. hecticum. Linneus, with 
his habitual carelessness in referring to Seba in the twelfth 
edition, has transposed the references of this and the preceding 
species; figure 21, here cited, being T. crenulata; figure 35, 
there quoted, being similar to the engraving of Gualtier. Both 
these delineations represent the T’.. cerulescens of Lamarck (as 
exhibited by Kiener and Hinds), and that shell (which forms 
part of the Linnean collection) is not actually opposed to the 
description in the tenth edition of the ‘Systema,’ where the 
obnoxious term “bifidis” was not inserted. Well might that 
admirable conchologist Deshayes ask why it should not be that 
shell, in his note to cerulescens in the ‘Animaux sans Vertébres.’ 
An enquiry conducted independently of him leads to the same 
conclusion; but, as to any change of name, that must be left to 
the judgment of my readers. 
