178 lAMELLTPEDES. 



KELLIA. Turton. See Kelliadse, K. orbicularis. PI. xxvii. 

 fig. 569. 



LABIS. Okeu. Monodonta, Lam. 



LABIUM, or inner lip, — is used to express that side of the aper- 

 ture which is nearest to the axis and generally contiguous to 

 the body whorl. The lower part of this, when sufficiently dis- 

 tinct from that part which overwraps the body whorl, is called 

 the Columella. 



LABEUM, or outer Hp,— is the edge of the aperture at the 

 greatest distance from the axis. 



LACINEA. Humph. Chama, Lam. 



LACUNA. Turton, 1828. Fam. Turbinacea, Lam.— Descr. 

 Globose, thin, covered with a smooth epidermis ; spire short, 

 consisting of" few rapidly increasing whorls ; aperture semilunar, 

 rounded at the extremities; columella oblique, reflected over 

 part of the umbUicus ; umbilicxis forming a lengthened area be- 

 hind the columella. Northern shores. L. PaUidula. PI. xvi. 

 fig. 364. 



LAGtENULA. Montf. A genus of microscopic Eoraminifera. 



LAMELLAEIA. Montagu. SiaAHETUS. Auct. (The thin, 

 hyaline species.) 



LAMELLATED. {Lamella, a thin plate.) Wlien the layers of 

 which a shell is composed, instead of being compacted into a 

 solid mass, are separated, overlaying each other in the manner 

 of tiles, with the edges prominent, the structure is said to be 

 lamellated or foliaceous. 



LAMELLIBEANCHIATA. Bl. The third order of the class 

 Acephalophora, Bl. consisting of bivalve shells, divided into the 

 families Ostracea, Subostracea, Margaritacea, Mytilacea, Poly- 

 dontes, Submytilacea, Chamacea, Conchacea, Pylorides, Ades- 

 macea. 



LAMELLIPEDES. Lam. (Lamella, a thin plate, pes, a foot.) 

 The third section of the order Conchifera Dimyaria, containing 

 bivalves, with the foot of the animal broad and thin ; divided 

 into the families Conchacea, Cardiacea, Arcacea, Trigonacea, 

 Nayades. Eig. 111. to 152. 



