EUGLENIA. 



[ 247 ] 



EUPLOTA. 



in fine weather. These creatures require 

 further investigation, for the settlement of 

 the specific characters and the relations to 

 their congeners. (See Astasie^.) We can 

 only notice two or three of the forms. 



E. pyrian (PL 24. fig. 1). Body, when ex- 

 tended, oval, turgid, piriform, obliquely 

 furrowed, green ; tail nearly as long as the 

 bodv, acute. Aquatic j length 1-1150 to 

 1-860". 



E. viridis (PI. 24. fig. 2 «, &). Fusiform 

 when extended ; head narrowed, short ; tail 

 conical, short (not cleft) ; green, hyaline at 

 the ends. Aquatic; length 1-1150 to 

 1-240". 



E. longicauda, Phacus longic, D. (PI. 24. 

 figs. 3 & 63). Depressed, elliptical or oval, 

 frequently twisted on its long axis, green, 

 with longitudinal striae; tail as long as the 

 bodv, hyaline, subulate. Aquatic ; length 

 1-280 to 1-120". 



E. acus (PL 24. fig. 4). Fusiform, slender, 

 subulate, straight, green in the middle ; head 

 attenuate, somewhat truncate, hyaline ; tail 

 verv acute, hyaline. Aquatic: length 1-5/0 

 to 1-216". 



BiBL. Ehrenb. Infus. p. 104 ; Dujardin, 

 Iiifus. p. 358; Mon-en, Rubefaction des 

 Eaux. Brux. 1841. 



EUGLENIA, Duj. (Infusoria). See As- 



TASI^A. 



The essential character of this family is 

 the presence of a contractile integument ; 

 this is probably of little importance, as in 

 many cases the nature of the integument has 

 been shown to depend upon season, locality, 

 and stage of development. 



EUGLYPHA, Duj. — A genus of Infusoria, 

 of the family Rhizopoda. 



Char. Free ; single ; carapace membra- 

 nous, transparent, resisting, elongato-ovoid, 

 iu"ceolate, covered with rows of tubercles or 

 depressions; orifice toothed; expansions 

 numerous, simple. 



This genus ap])ears unnecessarily separated 

 from Difflugia, E. 



E. tuherculata (PL 23. fig. 53). Carapace 

 covered with oblique or longitudinal rows of 

 rounded tubercles. Aquatic; length 1-280". 

 Sometimes posterior spines are present. 



E. alveolata (PL 23, fig. 54). Carapace 

 covered with polygonal depressions, in re- 

 gular oblique rows. Aquatic; length 1-280". 

 Posterior spines also present. 



See DiFFLUGiA. 



BiBL. Dujard. Infus. p. 251. 



EUMERIDION, Kutz. — Consolidated 

 with Meridion. 



EUNOTIA, Ehr. — A genus of Diato- 

 maceae. 



Char. Frustules free, single or binate, 

 quadrilateral ; linear or linear-oblong in front 

 view, curved or concavo-convex in side view ; 

 valves with terminal puncta (nodules ?) and 

 transverse or shghtly radiating striae, but no 

 canahculi. Aquatic and fossil. Alhed to 

 Epithemia. 



Many of the species have undulations or 

 ridges upon the convex surfaces ; striae re- 

 solvable into dots, but in some species diffi- 

 cult to detect; transverse section of frus- 

 tule trapezoidal. 



Kiitzing describes forty -four species; 

 Smith admits seven as British. 



E. tetraodon {Himantidium tetr., K.) (PL 

 18. fig. 30; a, side view; 6, front view). 

 Frustules with four ridges ; striae distinct ; 

 length 1-5/0". 



E. monodo7i {Himant.monodon, K.). Side 

 view lunate, no ridges, slightly constricted 

 near the obtuse ends ; striae obscure ; length 

 1-800". 



E. triodon. Ridges three ; ends attenuate, 

 rounded; striae obscure; length 1-500''. 



BiBL. Kiitzing, Bacill. p. 36, and Sp.Alg. 

 p. 4 ; Smith, Brit. Diatom, i. p. 15 ; Ralfs, 

 Ann. Nat. Hist. 1844. xiii. p. 459. 



EUPHORBIA. — AgenusofEuphorbiaceae 

 (Dicotyledons) including the British spurges, 

 or devil's-milk plants, characterized by the 

 white milky juice which exudes from them 

 when bruised or broken. The milk-sap is 

 contained in special structures, called milk- 

 vessels, which abound most in the bark, and 

 in the peripheral part of the pith. For their 

 characters and that of the milky juice, see 

 Latex-vessels, and Latex. 



EUPLOTA, Ehr.— A family of Infusoria. 



Char, Body sm-rounded by a carapace; 

 two distinct alimentary orifices, neither of 

 which is terminal ( = Oxytrichina with a ca- 

 rapace). 



Locomotive organs consisting of cilia, 

 hooks, claws, or styles. Dujardin states 

 that the carapace undergoes diffluence like 

 the substance of the body. 



The genera are thus distinguished : — 



Cilia, rT\rmi+>i i 



claws, or •?>: . I Head distinct .... Discocephalus. 



hooks < r^Vh ) No distinct head . . Himantophorus. 



present ; jj^^^h with teeth Chlamidodon. 



no styles. L 



Cilia, claws, and styles present Euplotes. 



Dujardin includes this family in his Ploes- 



conina. 



BiBL. Ehrenb. Infus. p. 374; Dujard. 

 Infus. p. 429. 



