FAMILY 12. CONVOLUTA. 267 
angustiore ; columella subrectaé, truncata, in mucronem desinente ; 
labro tenui, acuto, versus basem expansiore, subitd decurtato. 
The genus Terebellum, proposed by Klein, is one of the few intro- 
duced by that naturalist which have been appreciated by modern writers. 
Linnzus, however, included the only recent species referred to it in his 
genus Bulla; the Professor of Upsal paid little regard to the labours of 
his contemporaries ; he was so intent upon the vastness of his own 
scheme, that in his anxiety to embrace the whole three kingdoms of 
nature many little advantages were lost that would have done honour 
to his ‘Systema.’ Lamarck appears to have been the first to revive 
the genus in question, and the only controversy that exists at present is 
in regard to the situation that it should occupy in the system, De Blain- 
ville and some others contending that the Terebella have a strong affi- 
nity with the Strombi. For our own part, we have followed the arrange- 
ment of Lamarck for want of knowing a better, and we believe that until 
some allied species are discovered, the situation of this genus will be a 
source of much embarrassment. 
The shell of Terebellum may be described as being elongated, some- 
what cylindrical, but slightly convoluted, and emarginated at the base, 
the spire being prominent, and rather obtuse at the apex ; the aperture is 
longitudinal, and narrowed towards the upper part; the columella is 
nearly straight, truncated, and ends in a point ; and the outer lip is thin, 
sharp, expanded, and suddenly shortened off at the base. 
Examples. 
Pl. CCXCI. Fig. 1 and 2. 
TEREBELLUM sUBULATUM, Lamarck, Anim. sans vert., vol. vil. p. 410. 
Encyclopédie Méthodique, pl. 360. f.1.a,b,¢. Martini, Conch., 
vol. i. pl. 51. f. 568 and 569. 
Strombus terebellum, Rumphius. 
Terebellum pullum, Klein. 
Terebra alata, D’Argenville. 
