84 BORER. 



Dentalium. One particular species has received a specific name 

 in accordance with a supposed resemblance, namely, Dentalium 

 Aprinum, (of a Boar.) 



BONELLIA. Desh. A genus formed, in the first instance, for 

 the reception of Bulinus terebellatus, Lam. which Mr. G. B. 

 Sowerby, in his Genera of Shells, united with the genus Pyra- 

 midella. M. Deshayes, however, in his new edition of Lamarck, 

 makes the genus Bonellia include several species which I have 

 arranged in the genus Eulima. From the remarks of M. Deshayes, 

 torn. 8, p. 286, 287, we are led to suppose that the estimated 

 difference between Eulima and Bonellia consists in the latter 

 having the axis perforated ; or in other words, umbilicated. 

 After remarking " que Mr, Sowerby, junr. confond deux choses 

 bien distinctes, sous le nomme d'Eulima," M. Deshayes gives the 

 following description of his genus, (translated) " shell turri- 

 culated, smooth, polished, with the apex acute and laterally 

 inclined ; axis perforated throughout its length ; aperture small, 

 entire, angular at the extremities ; columella simple and without 

 folds ; outer lip thin, simple, nearly parallel with the longitudinal 

 axis." That author further remarks, " Mr. Sowerby, junr. a. 

 signale cinque especes vivant, que nous rapportons a notre genre." 

 (Sowerby, junr. Conchological Illustrations, parts 52 and 53 ; 

 50, Great Russell Street, Bloomsbury.) The species thus selected 

 are E. splendidula, E. marmorata, E interrupta, E. imbricata, 

 E. brunnea ; the two last of which have the umbilicus so incon- 

 siderable, as to be scarcely distinguishable from other species, 

 which M. Deshayes has left in the genus Eulima, and which 

 have a slight hollow, almost approaching to a perforation, behind 

 the columella. Eulima marmorata, (Bonellia, Desh.) is figured 

 in the plates, fig. 348. 



BODY WHORL. The last whorl, constituting the bulk of the shell. 



BORELIS. Montf. Melonia, Bl. A genus of microscopic 

 Foraminifera. 



BORER or PIERCER. A term applied to those species of Acepha- 

 lopodous Mollusca, which bore holes as dwellings in the rocks, 

 as the Pholades, and some others. 



