86 



BEACHIOPODA. 



columella simple and without folds ; outer lip thin, simple, 

 nearly parallel with the longitudinal axis." That author further 

 remarks, " Mr. Sowerby, junr. a signale cinqu especes vivant, 

 que nous rapportons a notre genre." (Sowerby, junr. Concho- 

 logical Illustrations, parts 52 and 53 ; Bohn, York Street, 

 Covent Grarden.) The species thus selected are E. splendidula, 

 E. marmorata, E. interrupta, E. imbricata, E. brunnea ; the two 

 last of which have the umbilicus so inconsiderable, 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, Desb. ) is figured in the plates. 

 PI. XV. fig. 348.' 



BODY WHOEL. The last whorl, constituting the bulk of the 

 sheH. 



BOEELIS. Montf. Melonia, B1. A genus of microscopic Fora- 

 minifera. 



BOEEE or PIEECEE. A term applied to those species of Ace- 

 phalopodous Mollusca, which bore holes as dwellings in the 

 rocks, as the Pholades, and some others. 



BEACHIOPODA. Lam. A family of symmetrical bivalves be- 

 longing to the third section of Lamarck's order " Conchifera 

 Monomyaria," described as bivalve (generally symmetrical) ad- 

 hering to marine bodies, by a tendon passing through the shell, 

 having no true ligament. What most distinguishes this family 

 and renders it remarkable is the structure of the animal. It has 

 two elongated, tendril-shaped arms. "When the animal is in a 

 state of repose these arms are coiled up spirally and enclosed in 

 the shell, but when required for use, are unfolded and extended. 

 This family contains the genera Orbicula, Terebratula and 

 Lingula, in the system of Lamarck, to which may be added 

 Thecidium, Productus, Spirifer, Magas, Pentamerus, Crania, 

 Strigocephalus, Strophomena, and some others enumerated in 

 the explanation of figures 201 to 219. The above genera may 

 be thus distinguished. 



1. Oebicula. Umbones central ; byssus passing through a 

 hole in the flat valve. Pig. 201. 



