LAFOEID.E. 



[ 4.52 ] 



LAOMEDEA. 



stolon ; hydrothecae tubular, sessile, or with 

 a short pedicel ; without an operculum ; 

 polypites cylindiical, with a conical pro- 

 boscis. There are five British species. 

 Blbl. llincks, Brit. Zmpli. p. 198. 



LAFOE'ID.E.— A suborder of Hydi-oida. 

 See Lafoi^a. 



LAGE'NA, Walker & Jacob.— A uni- 

 locular (rarely bilocular) In^aline Foramini- 

 fer, of the Nodosarine g-roup, generally flask- 

 shaped. The shell may be subglobular, 

 oval, oblong, or fusiform ; round, com- 

 pressed, or angular in section ; vaiiously 

 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. Layena Icecis 

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

 form. L. {Entosolenia) f/Iobosa (f. 2.3), 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. sqiiamo-fa (f -IQ) 

 was so called because the early microscopes 

 showed the pitted reticulation as raised 

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

 hexagonal mesh ornament. The last is 

 recent, and the others are both fossil and 

 recent. 



BiBL. Carpenter, Introcl. 156 ; Parker & 

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

 Mon. Cracj Foram. 28. 



LAGENEL'LA, Ehr.— A genus of Infu- 

 soria, fam. Cryptomouadina. 



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; 

 lenirth 1-1150"; probabty an Alga-spore. 



BiBL. Ehr. Lif. 45; l)uj. Inf. 3.33. 



LAGENIP'ORA, Hincks.— A genus of 

 Cheilostomatous Polyzoa, fam. Porinidie. 



i. socialis, on shells of the scallop [Pecten 

 ma.rimus) ; Hastings. (Hincks, Pulyz. 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'NOPHKYS, Stein.— A genus of 

 Vorticellina (Infusoria). 



Char. Capsides not stalked, attached by 

 the side to other bodies ; body suspended 

 from the narrow orifice. L. vayinicula, on 

 the tail of Cydopsine ; 2 other species on 

 Gammarus. (Stein, Infus. 1854.) 



mifi. Ph. Jn. 1858. 



LAGY'NIS, Schultze, = £'M/7??/^j7<a pt. 

 LAGY'NUS, Quenn. — A genus of Holo- 

 trichous Infusoria. Free, flask-shaped, with 

 an oral cu-cle of longer cilia ; neck ringed. 

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



LAMES'A'RLi, Lamx. — A genus of La- 

 mjuariaceee (Fucoid Algse), with large, flat, 

 stipitate fronds, several species of which are 

 common on rocky shores, attached to rocks 

 and stones. L. saccluirina has a riband- 

 shaped frond, growing from 2 to 12 feet 

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

 5 feet long, cut into a variable number of 

 segments. The internal structure presents 

 three layers, the outermost forming a kind 

 of epidermis. The sporanyes (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 stibstance of the 

 frond. In L. saccharina the presence of 

 the sporanges is denoted by a longitudinal 

 brown mark in the centre of the frund ; in 

 L. diyitata they occur in flat patches on the 

 extremities of the digitations. The zoo- 

 spores are little olive-coloui-ed bodies, with 

 an anterior and posterior cilium. Thuret 

 has seen them germinate. 



BiBL. Harvey, Mar. Aly. 29, pi. 4; Phyc. 

 Br. pi. 192, 22.3, 241 ; Greville, Aly. Brit. 

 t. 5 ; Thuret, Ann. Sc. Nat. 2 ser. xiv. 240, 

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



LAMINARLi'CE.E.— A family of Fu- 

 coidese. Olive-coloured inarticulate sea- 

 weeds, whose sporanges are superficial, 

 either forming indefinite cloud-like patches, 

 or covering the whole sm-face of the frond. 

 Brit, genera : 

 * Frond stalked, the stalk ending in an 



expanded leaf-like portion. 



Alai-ia. 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. 



LAMINGSIOP'TES, Megn.— A genus of 

 Acarina, allied to Sarcoptes. 



L. yallinarum occurs in the subcutaneous 

 tissueof the (?a^//««'(Megniu, Pf/r^.v. 151,fig.). 



LAOMEDE'A, Lamx.— A g.nus of Hy- 

 droid Zoophytes, family Campauulariidse." 



