TEREBELLUM. 



Lam, — Ann. du Mus. xvi. p. SOO. 



TESTA univalvisj convoluta, subcylindricaj apice 

 acuto. Apertura longitudinalis^ superne angus- 

 tata^ basi emarginata. Columella laevis^, trun- 

 cat^a. 



Established by Lamarck, and adopted by succeed- 

 ing conchological writers, but divided by Montfort, who, 

 on account of its hidden spire separated from it, the species 

 named convolutum by Lamarck, under the name Seraphs, 

 In doing so, he has been followed by the Author of " The 

 Mineral Conchology of Great Britain but as we are not 

 convinced of the necessity of doing this, and as we particu- 

 larly object to the needless multiplication of Genera, we 

 are obliged to dissent, and include Montfort's Seraphs in 

 one Genus, with Lamarck's Terehellum. The shell called 

 by Linne, " Bulla Terebellum," is the type of this marine 

 Genus, of which there are but very few species, either 

 recent or fossil ; the only recent one with which we are 

 acquainted is a very pretty whitish shell, or elegantly 

 variegated with brown marks ; or sometimes with brown 

 zigzag lines or dots. 



The Terebellum has no epidermis : it is described by 

 Lamarck as a thin shell, rolled around its longitudinal 

 axis in the form of an elongated cone, almost cylindrical 

 and pointed at its summit; its aperture is longitudinal, 

 narrow at its upper extremity, but more expanded below 

 and notched at its base ; its outer lip is entire and not 

 thickened, or at least very slightly ; its columella smooth 

 and truncated at its base; and when the outer part of the 

 shell is observed, it appears irregularly notched at the 

 base. 



The Terehellum suhulatum of Lamarck, (Bulla Tere- 

 hellum^ Linn.) has a distinct, but short spire^ consisting 



