LAMELLA

(Lat.), n. f. La2m(lasm)-e2l'la s. Dim. of lamina. Fr., lamelle, plaque. Ger.. L., Lamelle, Pldttchen. A thin plate or scale; as used ny Haeckel, any one of the plate-like derivatives from the germinal layers (e. g., a muscle plate). 1. In ducks, one of the plate-like proce es on the inside of the bill; also one of the individual barbs (Ger., Bar ben plat ten) of a feather. [L, 142; L, 341 (o, 43); L, 343 (a, 27).] 2. In botany, one of the thin parts found at the end of many styles; or, in hymenomycetes, the vertical plates on the lower surface of the pileus, upon which the hymt-nium is extended. [B,l, 19, 121, 123 (a, 35).] 3. In pharmacy, a preparation in the form of asheet. Bone lamellae. Lat., lamince o ium. Fr., lamelles o euses. Ger., Knochenlamellvn. Thin plates or layers of bone forming the ground-substance of o eous ti ue: distinguished, according to their position or arrangement, as periosteal, medullary, concentric, or intermediate lamellap (q. r.). fJ, 21, 31, 44.] Branchial lamellae. See Gill LAMELUS:. Biicral lamellae. See Buccal PLATES. Cerebellar lamellw. Fr., lamelles cere belle uses. See I,AM i NI: of the cerebellum. Circumferential lamellan. See Periostea! LAMELLAE. Concentric laiiu-1- IflB. The concentric plates of bone surrounding an Havers i an canal. [.I, 80, 31, 44.] Cribriform 1. See LAMINA cri6ro.s-a.-Endoderm 1. A continuous plate of endoderm formed by the coalescent walls of the enteric cavity in the young forms of Hydrozoa. [B, 77 (a, 29).] Epithelial 1. of the all a i i to is. Ger., epitheliale Lamelle der AUantois. An epithelial proce of the allantois that invests the umbilical cord during the first two months of gestation. [A, 8.] External fundamental lamella'. See Periosteal LAMEMJK. Fundamental (or General) lumoHn-. Ger., General lam ellen, Grund lam ellen. A general term for all the periosteal, intermediate, and medullary lamellae of bone. [J, 21, 5.1 Cf. Grownd-PLATE. Gill lamellfe. The folds of mucous membrane of the gill cavity of fishes and certain molluscs in which the capillary ve els are distributed. [L, 207, 353 (a, 39).] Ground lamellw. See Fundamental lamellae. Havers i an lamella'. Fr., lamelles de Havers. Ger., Havers is che iMntellen. See Concentric lamella}. Homogeneous 1. Kr., lam i-Ile liomogene. Of Ranvier. the clear, apparently homogeneous, layer of a bone 1. [J, 24.] Intermediate lamelliv. Fr.. lamelh.v:inl< nut'iliaires. Oer.. Schaltlnmellen. Bone lamellae extending in various directions and filling the irregular spaces between the concentric lamella'. They E, he; K, ell; O, go; I, die; I, in; N, in; N, tank; [s. 572]