LAFOEID^E. 



[ 452 ] 



LAOM^DEA. 



stolon ; hydrothecae tubular, sessile, or with 

 a short pedicel ; without an operculum ; 

 polypites cylindrical, with a conical pro- 

 boscis. There are five British species. 



BIBL. Hiucks, Brit. Zooph. p. 198. 



LAFOE'IDyE. A suborder of Hydroida. 

 See LAFOEA. 



LAGE'NA, Walker & Jacob. A uni- 

 locular (rarely bilocular) hyaline Foramini- 

 fer, of the Nodosarine group, generally flask- 

 shaped. The shell may be subglobular, 

 oval, oblong, or fusiform ; round, com- 

 pressed, or angular in section ; variously 

 ornamented with ribs, network, tubercles, 

 and spines ; open at one or both ends, with 

 or without a neck, and often with the tube 

 turned inwards (Entosolenian). Recent 

 and fossil all over the world. Lagena Icevis 

 (PL 23. f. 22) is a typical and very common 

 form. L. (Entosolenid) globosa (f. 23), with 

 the neck-tube introverted, is another very 

 common variety. L. striata (f. 24) is an 

 elongato-apiculate variety, delicately costu- 

 late. L. semistriata (f. 25) is L. globosa 

 with short basal ribs. L. squamosa (f. 26) 

 was so called because the early microscopes 

 showed the pitted reticulation as raised 

 scales. L. scalariformis (f. 27) has a bold 

 hexagonal niesh ornament. The last is 

 recent, and the others are both fossil and 

 recent. 



BIBL. Carpenter, Introd. 156 ; Parker & 

 Jones, Phil. Tr. civ. 345; P., J. & Brady, 

 Mon. Crag Foram. 28. 



LAGENEL'LA, Ehr. A genus of Infu- 

 soria, fam. Cryptomonadina. 



L. euchlora (PI. 31. figs. 35 & 36) has a 

 carapace with a beak or neck like that of a 

 bottle, and a red eye-spot ; freshwater ; 

 length 1-1150"; probably an Alga-spore. 



BIBL. Ehr. Inf. 45; Duj. Inf. 333. 



LAGENIP'ORA, Hincks. A genus of 

 Cheilostomatous Polyzoa, fam. Pormidae. 



L. socialis, on shells of the scallop (Pecten 

 maximus) ; Hastings. (Hincks, Polyz. 235.) 



LAGENGE'CA, Kt. A genus of Fla- 

 gellate Infusoria. 



Char. Solitary, with a collar, in a protec- 

 tive sheath. 



L. cuspidata (PI. 53. fig. 21), amber- 

 coloured ; pond water. (Kent, Inf. 359.) 



LAGE'NOPHRYS, Stein. A genus of 

 Vorticellina (Infusoria). 



Char. Capsules not stalked, attached by 

 the side to other bodies ; body suspended 

 from the narrow orifice. L. vaginicola, on 

 the tail of Cyclopsine-, 2 other species on 

 Gammarus. (Stein, Infus. 1854.) 



BIBL. Stein, Inf. 1854, 88; Pritchard, 

 Inf. 604 ; Claparede et Lach. Inf. 



LAGO'TIA, Wright, =FBEI A. Wright, 

 Edin. Ph. Jn, 1858. 



LAGY'NIS, SchvHtze t =Eufflypha pt. 



LAGY'NUS, Quenn. A genus of Holo- 

 trichous Infusoria. Free, flask-shaped, with 

 an oral circle of longer cilia ; neck ringed. 

 L. elegans, freshwater. (Kent, Inf. 520.) 



LAMINA 'HI A, Lamx. A genus of La- 

 minariaceae (Fucoid Algae), with large, flat, 

 stipitate fronds, several species of which are 

 common on rocky shores, attached to rocks 

 and stones. L. saccharina has a riband- 

 shaped frond, growing from 2 to 12 feet 

 long. L. digitata has a broad frond, 1 to 

 5 feet long, cut into a variable numb or of 

 segments. The internal structure presents 

 three layers, the outermost forming a kind 

 of epidermis. The sporanges (spores of 

 authors) contain ciliated zoospores which 

 reproduce the plant. They are little elon- 

 gated sacs, nestling between epidermal cells 

 of peculiar structure, standing perpendicu- 

 larly upon the central substance of the 

 frond. In L. saccharina the presence of 

 the sporanges is denoted by a longitudinal 

 brown mark in the centre of the frond ; in 

 L. digitata they occur in flat patches on the 

 extremities of the digitations. The zoo- 

 spores are little olive-coloured bodies, with 

 an anterior and posterior cilium. Thuret 

 has seen them germinate. 



BIBL. Harvey, Mar. Alg. 29, pi. 4 ; Phyc. 

 Br. pi. 192, 223, 241 ; Greville, Alg. Brit. 

 t. 5 ; Thuret, Ann. Sc. Nat. 2 se*r. xiv. 240, 

 pi. 30. figs. 1-4 ; Henfrey-Masters, Bot. 



LAMINARIA'CE^E. A family of Fu- 

 coideae. Olive-coloured inarticulate sea- 

 weeds, whose sporanges are superficial, 

 either forming indefinite cloud-like patches, 

 or covering the whole surface of the frond. 

 Brit, genera : 

 * Frond stalked, the stalk ending in an 



expanded leaf-like portion. 



Alaria. Leaf membranous, with a carti- 

 laginous midrib. 



Laminaria. Leaf simple or cleft, without 



a midrib. 

 ** Frond simple, leafless. 



Chorda. Frond cylindrical, hollow, with 

 transverse partitions. 



LAMINOSIOP'TES, Megn. A genus of 

 Acarina, allied to Sarcoptes. 



L. gallinarum occurs in the subcutaneous 

 tissue of the Gallince(b[egmii ? Paras. 151, fig.). 



LAOMEDE'A, Lamx. A genus of Hy- 

 droid Zoophytes, family Campanulariidae. 



