157 
TEREBELLUM. Za Marck. 
Gen. Cuar. A convoluted, elongated, univalved, 
shell, spire exposed; base truncated ; mouth 
longitudinal, plain, narrow above, broader 
below, with a sinus near the base. 
"Tue genus Terebellum was constituted by La Marck, 
who gave Linneus’s Bulla Terebellum for the type, with 
the specific name subulatum: with this the above Gen. 
Char. will agree, to the exclusion ef Seraphs. In 
Terebellum subulatum the spire is acute, and the upper 
edges of the whorls pass very obliquely round it, accom- 
panied by a linear canal connected with the upper angle 
of the mouth: the surface is polished and destitute of 
epidermis : the columella slender, and nearly straight, 
free from plaits or teeth: it is an inhabitant of warm 
seas. 
TEREBELLUM fusiforme. 
TAB. CCLXXXVII. 
Seec.Cuar. Subfusiform, cylindrical, with a visi- 
ble obtuse spire ; aperture with an adpressed 
straight canal proceeding from its upper angle 
to the apex of the spire. 
Syn. Terebellum fusiforme? La Marck Env. de 
Paris, p. 22. 
Tae aperture, excluding the canal at its upper angle, 
is about three-fifths the length of the shell, and is rather 
broader towards its upper part than in either Seraphs 
convolutum or the recent Ter. subulatum. The manifest 
obtuse spire is marked by the very oblique upper edge 
