82 BATOLITES. 



Bl. corresponding witli Sessile Cirripedes, Lam., and consisting of 

 Coronular Multivalves, whicli are fixed, and in a manner soldered 

 to submarine substances, by tbe base of the shell ; as distiaguisbed 

 from the Lepadicea, BL, Pedunculated Cirripedes, Lam., which are 

 attached by a fleshy stalk. The Balanidea are composed of two 

 sets of valves, besides the shelly plate or base on which they rest. 

 The first, called the Parietal valves, are arranged so as to surround 

 the body of the animal ; the second, called the Opercular valves, 

 are placed horizontally, so as to cover the aperture. 

 BALEA. Prideaux. G-ray. 1824. Fam. Colimacea, Lam. — Bescr. 

 Spiral, turrited, concentrically striated, sinistral, and covered 

 with a thin brown epidermis ; spire composed of numerous 

 whorls, gradually increasing in size ; aperture small, sub-quad- 

 rate ; peritreme entire, shghtly thickened, with a very slight fold 

 on the columella ; axis perforated.— 0^;*. A genus of small land 

 shells, found in moss at the roots of trees in Britain, not very 

 nearly resembling any other land shells, except Clausilia, from 

 which they differ in not having the clausium. They have been 

 placed in Helix by De Ferrusac, and in Pupa by Draparnaud. 

 Helix perversa. Per. Pupa perversa, Drap. B. fragilis, PI. xiv. 

 fig. 296. 

 BAEBATA. Humphrey. 1797. Dipsas. Leach. 1817. 

 BAENACLES. Pentelasmis, Auct. (fig. 34.) Called Anatifa, 

 by Linnseus and Lamarck, from the ancient notion that they 

 were the eggs or embryo of the Barnacle Duck. See Ajstatifee. 

 BASE. In all shells which are attached to sub-marine substances 

 the base is that part of th6' shell which forms the point of attach- 

 ment, — as for instance, the attached valve of Spondylus, the 

 basal plate of Balanus, the lower part of the peduncle of Pen- 

 telasmis ; in unattached Bivalves, the margin opposite to the 

 ■umbones, where the foot of the animal, or the part analogous to 

 it, protrudes ; in spinal univalves, the aperture, which rests on 

 the back of the animal when walking. Lamarck and some other 

 authors have used the term base as simply opposed to apex, and 

 apply it to the anterior of the aperture. 

 BATOLITES. Montf. Hippueites, Auct. 



