DIFFLUGIA. 



[ 263 ] 



DIMORPHINA. 



BIBL. Berk. Hook. Brit. Flor. v. pt. 2. 

 357; Ann. N. H. 1840, vi. 438; Greville, 

 So. Crypt. jF7.pl. 212. fig. 1 (as Stilbospord); 

 Tul. Carp. ii. 120. 



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 multifid tentacular 

 expansions. Freshwater. 



The carapace is membranous, incrusted 

 with minute grains of sand (and carbonate 

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

 pressions or tubercles ; these form the genus 

 Euglypha, D. D. Enchelys forms gem- 

 mae, and also resolves itself into four 

 " spores." 



Species very numerous. 



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

 rapace oval or almost spherical, covered 

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



D. oblonga, E. (D. ylobulosa (?), D.). 

 Carapace oval, oblong, or rounded, smooth, 

 brownish; length 1-200". 



BIBL. Leclerc, Mem. Museum, ii. 474 ; 

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

 jardin, Inf. 248; Schlumberger, Ann, Sc. 

 Nat. 1845, iii. 254 ; Schneider, Ann. N. H. 

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

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

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

 1877, xvii. 115. 



DIGLENA, Ehr. A genus of Rotatoria, 

 of the family Hydatinsea. 



Char. Eyes two, frontal ; foot forked. 



There are no other appendages than the 

 foot and the rotatory organ. 



Nine species. 



D. lacustris (PL 43. figs. 21, 22). Body 

 oval, transparent, truncate in front ; foot 

 suddenly attenuate, somewhat more than 

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

 part of the foot in length ; 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- 

 riorly in the form of a swan's neck, with 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. (PL 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 

 1-160 to 1-120". 



D. anser (Amphileptus anser, E.). 



D. margaritifer (Amphileptus marg., E.). 



Dujardin separates these species from the 

 genus Amphileptus, on account of their not 

 possessing a reticulated integument, and 

 their undergoing diffluence. 01. & Lachm. 

 unite them with Amphileptus. 



BIBL. Duj. Infus. 404. 



DILOPHOS'PHORA, Desm. A genus 

 of Sphaeronemei (Stylosporous Fungi), con- 

 sistingofSphferia-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). 



D. graminis, Desm. = Spharia Alopecuri, 

 Fries. Sometimes very destructive to wheat- 

 crops in the south of England. 



BIBL. Desmazieres, Ann. Sc. Nat. 2 se>. 

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



DIMASTIGOAU'LAX, Dies. = Peridi- 

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

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



DIMEREGRAM'MA, Pritch. A genus 

 of Diatomaceae. 



Char. Frustules quadrangular, two or 

 more together; valves (undulate, Rab.) with 

 transverse costae interrupted by a smooth 

 longitudinal line. 



Several species. 



BIBL. Pritchard, Inf. 123 ; Gran. Wien. 

 Verh. 1862; Gregory, Diat. of Clyde. 22; 

 Rabenhorst, Flor. Alg. i. 123. 



DI'MONAS, Kent. A genus of Flagel- 

 late Infusoria. 



Char. Free, ovate or pyrif orm j flagella 

 2, equal ; mouth very dilatable. 



Two species ; in infusions, fresh and salt ; 

 hay. (Kent, Inf. 421.) 



DIMORPHI'NA, D'Orb. A hyaline 

 Foraminifer, in which the early chambers 

 have the alternate growth of a Polymor- 

 phina, and the later ones the linear arrange- 

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



