ICHNEUMON IDiE. 



[ 410 ] 



ILLOSPOrJUM. 



steins and leaves of various plants. II. ru- 

 ffosmn has been placed by some authors 

 among liichens (as Oder/rapha macularis, 

 cpij^hei/a, Eug. I3ot.). It is common ou 

 smooth livhuj branches of oak and beech. 

 H. jmlicfire, II. Ituhi, H. Pini, and H. cul- 

 mi(/enu7n, the gvass-IIysteriimi and H.-folii- 

 colium, growing on leaves of hawthorn, ivy, 

 or oak, are common. The species with 

 septate spores (fig. 359) form the genus 

 Ilysteroyraphimn, Corda. 



Fig. 358. 



Fig. 359. 



Fig. 358. Hysteriumfoliicolium^Hederae. Anascus 

 containing eipht spores, magnified 100 

 diameters; with loose spores, maguifled 

 200 diameters. 



Fig. 359. Hysterium elongatum. Spores. Magnified 

 400 diameters. 



BiBL. Berk. Ilooh. Br. Fl. vol. ii. pt. 2. 

 293; Ann. N. H. 1851, vii, 185; Fries, 

 Sum. Veyet. 3G8 ; Greville, Sc. Crypt. Ft. 

 pis. 24, 26, 72, 87, 88, 129 & 167. 



I. 



ICHNEUMON'IDyE.— A family of Hy- 

 menopterous Insects. The ovipositor is an 

 interesting microscopic object. (West- 

 wood, Insects, ii. 140.) 



ICIITIIYDI'NA, Ehr.— A family of Ro- 

 tatoria. 



Char. No carapace ; rotatory organ sin- 

 gle, continuous, not lobed nor divided at 

 the margin. 



The rotatory organ is in the form of a 

 circle in Ptyyura and Glenophora ; in Ich- 

 thydium and C/ice/onotus it is long, baud-like, 

 and placed upon the ventral surface. 



The family is thus divided: — 



Eyes absent, 



Kc) hairs present, 



Tail-like foot simple and truncate... Tli/gura. 



forked Ichthydium. 



Having bristly hairs. 



Tail simple, truncate Dasydytes. 



Tail forked Chatonotus. 



Eye single, frontal Sacculus. 



Ej'estwo, frontal Glenophora. 



Dujardin places Ivhfhydimn and Chccto- 

 no/wA' among the lufiisuria; and Ityyura 

 among his MelicertLua. 



BiBL. Ehrenberg, Infus. 386 ; Dujardin, 

 Inf. ; Schultze, Mtill. Archiv, 185-3, 241. 



ICIiTII YDTUM, Ehr.— A doubtfulgenus 

 of Rotatoria, of the family Ichthydina. 



Clutr, Ej'es absent ; body without dorsal 

 hairs ; pediform tail forked ; locomotion 

 eftected by cilia placed upon the ventral 

 surface. 



Dujardin places this genus among his 

 symmetrical Infusoria. 



I.podura (PL 31. tig. 23). Body linear- 

 oblong, often slightly constricted near the 

 anterior turgid and sometimes trilobate 

 end ; foot short ; freshwater; length 1-140". 



BiBL. Ehrenberg, Infus. p. .j88. 



ICIITIIYOPHTHI'RI US, Fouquet.— A 

 S'enus of Holotrichous Infusoria. 



Char. Subglobose ; with an anterior 

 suctorial disk, including converging setie. 

 Somewhat like Pantotrichnm. 



I. muUlfiliis (PI. 53. fig. 19). Parasitic 

 on the trout, the loach, &c. ; forming milky 

 spots on the tins, giUs &c.; length 1-150". 

 (Kent, Inf 530.) 



IDMO'NEA, Lamx.— A genus of Infun- 

 dibulate Cj'clostomatous Polyzoa, of tiie 

 family Tubuliporidffi. 



Distinguished by the erect dichotomously 

 divided zoary ; and the tubular cells, on 

 one side only, in transverse rows, divided 

 into two sets by a median longitudinal line. 



I. atlantica. Branches roundish, tapering 

 to a point ; cells four in each row, the 

 innermost tubes, considerably protruded. 

 Height 4-10". On zoophytes. 



BiBL. Johnston, Br. Zooph. 278 ; Busk, 

 Br. Mus. Cat., Foss. Pol. Cray {Pal Soc.) ; 

 Ilincks, Pohjz. 450. 



I'DUNA, CI. & Lachm.— A genus of In- 

 fusoria, fam. Ervilina. 



Char. Those of Ervilina with a carapace, 

 the valves quite separate. 



I. sulcata. Right valve with four raised 

 longitudinal ribs ; left valve plane and 

 smooth. Northern sea. Length 1-180". 



BiBL. Clap, and Lachm. Infus. p. 283. 



I'DYA, V\i\\v^YL= Ca)ithocanq>ttis, pt., 

 Baird. I. furcatu=C. f. (l»rady, Copcp., 

 Pay Soc. ii. 171 ). 



ILIOl'SYL'LUS, Br. & Rob.— A genus 

 of Copepodous Entomostraca. 



/. coriaceuSf in sea-miid. (Brady, Copep. 

 ii. 143.) 



ILLICITOI. See Wintekeje. 



ILLOSPORIUM, Mart.— A genus of 

 Stilbacei (Ilyphomycetous Fungi), mo.stly 

 rose-red gelatinous bodies growing upon 



