ICHNEUMONID^E. 



[ 410 ] 



ILLOSPOPJUM. 



stems and leaves of various plants. H. ru- 

 ffosum has been placed by some authors 

 among Lichens (as Odegrapha macularis, 

 epiphega, Eng. Bot.). It is common on 

 s.nooth living branches of oak and beech. 

 H. pulicare, If. Rubi, H. Pini, and H. cul- 

 migenum, the grass- Hysterium and H.'folii- 

 colium, growing on leaves of hawthorn, ivy, 

 or oak, are common. The species with 

 septate spores (fig. 359) form the genus 

 Hysteroyraphium, Corda. 



Fig. 358. 



Fig. 359. 



Fig. 358. Hysterium foliicplium ft Hederae. An ascus 

 containing eight spores, magnified 100 

 diameters ; with loose spores, magnified 

 200 diameters. 



Fig. 359. Hysterium elongatum. Spores. Magnified 

 400 diameters. 



BIBL. Berk. Hook. Br. Fl vol. ii. pt. 2. 

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

 Sum. Veget. 368 ; Greville, So. Crypt. Ft. 

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



I. 



ICHNEUMON'IDJE. A family of Hy- 

 menopterous Insects. The ovipositor is an 

 interesting microscopic object. (West- 

 wood, Insects, ii. 140.) 



ICHTHYDI'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 Ptygura and Glenophora ; in Ich- 

 thydium and Chcetonotus it is long, band-like, 

 and placed upon the ventral surface. 



The family is thus divided: 



Eyes absent, 

 'No hairs present, 



Tail-like foot simple and truncate... Ptygura. 



forked Ichihydium. 



Having bristly hairs, 



Tail simple, truncate Dasydytes. 



Tail forked Chcetonotus. 



Eye single, frontal Sacculu*. 



Eyes two, frontal Glenophora. 



Dujardin places Ichthydium and Chceto- 

 notus among the Infusoria; and Ptygura 

 among his Melicertina. 



BIBL. Ehrenberg, Infus. 386 ; Dujardin, 

 Inf. ; Schultze, Mutt. Archiv, 1853, 241. 



lCHTHYD'IUM,Ehr. A doubtful genus 

 of Rotatoria, of the family Ichthydina. 



Char. Eyes absent ; body without dorsal 

 hairs ; pediform tail forked ; locomotion 

 effected by cilia placed upon the ventral 

 surface. 



Dujardin places this genus among his 

 symmetrical Infusoria. 



I.podura (PI. 31. fig. 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. 388. 



ICHTHYOPHTHI'RIUS, Fouquet. A 

 genus of Holotrichous Infusoria. 



Char. Subglobose ; with an anterior 

 suctorial disk, including converging setae. 

 Somewhat like Pantotrichum. 



I. multi/illis (PL 53. fig. 19). Parasitic 

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

 spots on the fins, gills &c. ; length 1-150". 

 (Kent, Inf. 530.) 



IDMO'NEA, Lamx. A genus of Infun- 

 dibulate Cyclostomatous Polyzoa, of the 

 family Tubuliporidas. 



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. Crag (Pal Soc.) : 

 Hincks, Polyz. 450. 



I'DUNA, 01. & 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, Philippi= Canthocamptus, pt., 

 Baird. I. furcata=C. f. (Brady, Copep., 

 Ray Soc. ii. 171). 



ILIOPSYL'LUS, Br. & Rob. A genus 

 of Copepodous Entomostraca. 



I. coriaceus. in sea-mud. (Brady, Copep. 

 ii. 143.) 



ILLICIUM. See WINTERED. 



ILLOSPORIUM, Mart. A genus of 

 Stilbacei (Hyphomycetous Fungi), mostly 

 rose-red gelatinous bodies growing upon 



