LEPRALIA. 



[ 459 ] 



LEPTOTHRIX. 



cracks, &c. Its habits are nocturnal. Its 

 beautiful silvery scales are used as TEST- 

 OBJECTS (PL 1. fig. 6). 



There are many other species, the scales 

 of which probably exhibit the same struc- 

 ture. 



BIBL. Gervais, Walckenaer's Apttres, iii. 

 p. 450 ; Lubbock, Linn. Trans. 



LEPRA'LIA, Johnst. A genus of Chei- 

 lostomatous Polyzoa, family Membranipo- 

 ridae (Escharidae, Hincks). 



Char. Polypidom adnate, crustaceous, 

 formed of a layer of juxtaposed urceolate 

 cells, closed in front, and spreading cir- 

 cularly. 



The very numerous species form white, 

 yellow, or reddish crusts upon rocks, shells, 

 and sea-weeds. Avicularia and vibracula 

 present in some, but absent in others. Mouth 

 of cells sometimes with spines. 



L. variolosa (PL 41. fig. 17). Cells 

 oblong, depressed, roughish, interstices 

 punctured ; orifice semioval or roundish, 

 margin plain. On stones and shells, com- 

 mon ; varieties occur with the lower lip 

 notched, or with a tooth. 



L. unicomis. Cells ovate, scaly, with a 

 short obtuse process or knob above the ori- 

 fice, which is roundish, with a distinct 

 notch in the upper margin ; common. 



BIBL. Johnston, Br. Zooph. 300 ; Busk, 

 Mar. Polyz. ; Hincks, Polyz. 297. 



LEPTOCLINUM, M.-Edw. A genus of 

 Tunicate Mollusea, of the family Botryllidae. 



Distinguished by the thin, sessile, in- 

 crusting mass of variable form, the nume- 

 rous systems, the six-rayed branchial ori- 

 fice, and the anal orifices opening into a 

 common more or less branched cloaca. 



Six British species: maculosum, asperum, 

 aureum,gelatinosum, Listerianum, and punc- 

 tatum, found upon the roots of Laminaria 

 and other marine algae ; the two former 

 common. 



BIBL. Forbes and Hanley, Br. Mollusca, 

 i. 16; Gosse, Mar. Zool. ii. 32 j M.-Edwards, 

 Mem. snr les Ascicl. comp. 



LEPTOCYSTINE'MA, Archer, = Go- 

 NATOZYGON, De Bary, 1856. 



LEPTODIS'CUS/Hertwig. A genus of 

 marine Flagellate Infusoria. 



L.medusoides, diam.^"; Messina. (Kent, 

 Infus. 400.) 



LEPTOGID'IUM, Nyl. A genus of 

 Collemacei (Byssaceous Lichens). L. den- 

 driscum, on mossy trees on high mountains. 

 (Leighton, Lick. Fl. 13.) 



LEPTO'GIUM. A genus of Collema- 



ceous Lichens. Thallus with a distinct 

 cortical layer, granula ; gonima monili- 

 form; apothecia lecanorine; spores eight, 

 multilocular, rarely simple. Species nume- 

 rous. On mossy trunks, walls. 



BIBL. Leighton, Lich. Flor. 25. 



LEPTO'MONAS, Kt. A genus of Fla- 

 gellate Infusoria. Free, narrowly fusiform, 

 flagellum single. 



L. Biitschlii, in the intestine of Trilobus 

 gracilis. (Kent, Inf. 243.) 



LEPTOS'CYPHUS, Allman. A genus 

 of Hydroid Zoophytes. 



Char. Capsules ovato-conic; polypes 

 cylindrical, proboscis conical ; reproduction 

 by free medusiform bodies. 



L. tennis, on Laminaria ; Stromness. 



BIBL. Allman, Ann. N. H. 1864 ; Hincks, 

 Br. Hyd. Zooph. p. 196. 



LEPTOSTRO'MA, Fr. A genus of 

 Sphceronemei(StylosporousFungi), probably 

 consisting only of the younger stylosporous 

 states of species of HYSTEBIUM or PHACI- 

 DIUM. Several species are recorded as 

 British, some common, occurring on the 

 stems and leaves of sedges, rushes, Pteris, 

 &c., forming small round flat spots, from 

 which the upper part of the perithecium 

 splits off, leaving a little margined scar, in 

 which are seated the stylospores. 



BIBL. Berk. Br. ^Y/ii.pt. 2. 297; Ann. 

 N. H. i. 257, vi. 365 ; Tulasne, Ann. N. 

 H. 2 ser. viii. 114. 



LEPTOTHRICH'E^. A subfamily of 

 the Oscillatoriaceae. Filaments very fine, 

 adnate, sheathed, indistinctly articulate ; 

 movement slow ; solitary or fasciculate ; 

 for the most part in broad and diffused 

 layers. 



BIBL. Eabenhorst, Fl. Alg. ii. 8 & 73. 



LEP'TOTHRIX,Kutz. A supposed ge- 

 nus of Oscillatoriaceae. Found on damp 

 stones, among wet plants, and in foul water ; 

 very probably consisting of the mycelial 

 filaments of mildew Fungi. 



The filaments are very slender, simple, 

 continuous or obscurely jointed. 



L. ochracea, K. (Oscttlatoria ochracea, 

 Grev.) is an obscure production, forming 

 yellowish-brown flocculent masses, common 

 in boggy pools. 



L, buccalis and L. insectorum, Ch. Robin, 

 probably belong to some Fungus. 



BIBL. Kiitz. Sp. Alg. 262 ; Tab. Phyc. i. 

 pi. 61. fig. 1 ; Robin, Vegtt. Parasit. 

 2nd ed. 345, 355; Mettenheimer, Mus. 

 Senckenb. 1857, 139 ; Moggridge. Jn. M. 8. 

 1868. 



