DIFFLUGIA. 



[ 263 ] 



DLMORPIIINA. 



BiBL. Berk. Kooh. Brit. Fl,r. v. pt. 2. 

 357 ; Ann. N. II. 1840, vi. 438 ; Grcville, 

 8c. Cnipt. i^/.pl. :?12.ti<r. 1 (as Stilhosjjora); 

 Till. Carp. ii. li'O. 



DIFFLU'GIA, Leclerc— A genus of 

 Rhizopoda, of the family Arcellina. 



Char. Contained in a spherical or oblong, 

 urceolate, incrusted carapace, from the an- 

 terior extremity of which are emitted 

 variable numerous or niultifid tentacular 

 expansions. Freshwater. 



The carapace is membranous, incrusted 

 with minute grains of sand (and carbonate 

 of lime ?) ; in some it is covered with de- 

 pre>-sions or tubercles; these form the genus 

 EiKjhjpha, D. D. Enchebjs forms gem- 

 mie, and also resolves itself into four 

 " spores." 



Species verv numerous. 



D. proteiformis, E. (PI. 30. fig. 39.) Ca- 

 rapace oval or almost spherical, covered 

 with minute grains of sancl; length 1-240". 



D. oblo)if/a, E. {D. i/lobulosa (:-'), D.). 

 Carapace oval, oblong, or rounded, smooth, 

 brownish; length 1-200". 



BiBL. Leclerc, Mem. Muricum, ii. 474 ; 

 Ehr. Inf. 130 ; and Berl. Ber. 1840 ; Du- 

 jardin, //i/. 248; Schluinberger, Ann. Sc. 

 Nat. 184o, iii. 254; Schneider, Ann. N. II. 

 1854, xiv. 332 ; Clap. & Lachm. Inf. 447 ; 

 Lauix, Qu. Mic. Jn. 1865, 285 ; Tatem, M. 

 M. /. 1870, iv. 313; Archer, Qu. M. J. 

 1877, xvii. 115. 



DIGLEXA, Ehr.— A genus of Rotatoria, 

 of the family Hydatinaea. 



Char. Eyes two, frontal ; foot forked. 



There are no other appeudages than the 

 foot and the rotatory organ. 



Nine species. 



D. lacmtris (PI. 43. figs. 21, 22). Body 

 oval, transparent, trimcate in front ; foot 

 suddenly attenuate, somewhat more than 

 l-4th of the body in length ; toes l-3rd 

 part of the foot in lenoth ; freshwater ; 

 length 1-70". 



BiBL. Ehr. Infus. 441 ; Gosse, Ann. N. 

 H. 1851, viii. 200. 



DILEP'TUS, Duj.— A genus of Infuso- 

 ria, fam, Trichodina. 



Char. Body fusiform, prolonged ante- 

 ri(jrly in the form of a swan's neck, ^^dth a 

 lateral mouth at the base of the prolonga- 

 tion ; entire surface covered with vibratile 

 cilia, which are more distinct in front and 

 near the mouth. 



D. folium, D. (PI. 30. fig. 40). Body 

 very flexible, in the form of a lanceolate 

 leaf, narrowed in front ; with nodular, reti- 



culated, irregular ribs j freshwater; length 

 1-1()0 to 1-120". 



I), anscr (Amphileptus anser, E.). 



D. margaritifer {Amphile2)tus marr/., E.). 



Dujardin separates these species from the 

 genus Amj)hil('pfus, on account of their not 

 possessing a reticulated integument, and 

 their undergoing diilluence. CI. & Lachm. 

 unite them with A?nphileptu.ji, 



BiBL. Duj. Infus. 404. 



DILOPHOS'PHORA, Desm.— A genus 

 of Sphferonemei (Stylosporous Fungi), con- 

 sisting of »S/iA<re/7a-like plants (without asci), 

 growing upon the leaf-sheaths and glumes 



Fig. 177. 



Dilophosphora graminis. 

 Spores. Magnified 800 diams. 



of grasses ; remarkable for the curiously ap- 

 pendaged spores (fig. 177). 



I), graminis, Desm. = Sjyhrvria Ahpecun, 

 Fries. Sometimes very destructive to wheat- 

 crops in the south of England. 



BiBL. Desmazieres, Ann. Sc. Nat. 2 ser. 

 xiv. p. 4. pi. 1. fig. 2. 



DIMASTIGOAU'LAX, Dies. = Peridi- 

 niutn cornutum, Ehr., Ceratium c, Clapa,- 

 rede & Lachmanu. (Kent, Inf. 462. ) 



DBIEREGRAM'MA, Pritch.— A genus 

 of Diatomaceae. 



Char. Frustules quadrangular, two or 

 more together; valves (undulate, Rab.)with 

 transverse costfe interrupted by a smooth 

 longitudinal line. 



Several species. 



BiBL. Pritchard, Inf. 123 ; Grun. Wien. 

 Verh. 1862; Gregory, D/«;^. (/ Clgde, 22; 

 Rabenhorst, F/or. Alg. i. 123. 



DI'310NAS, Kent.— A genus of Flagel- 

 late Infusoria. 



Char. Free, ovate or p^i'iform ; flagella 

 2, equal ; mouth very dilatable. 



Two species : in infusions, fresh and salt ; 

 hav. (Kent, Inf 421.) 



DIMORPHI'NA, D'Orb. — A hyaline 

 Foraminifer, in which the early chambers 

 have the alternate growth of a Polgmor- 

 pliina, and the later ones the linear arrange- 

 ment of a Nodosaria. D. tuberosa, D'Orb. 



