in^ELLA. 



[ 799 ] 



VALLISNEKIA. 



Fi{?. 790. 



U i 



a I 



Muscular elements from a uterus at five montha' ges- 

 tation, a, formative cells ; 6, young, c, fully developed 

 muscular fibres. Magnified 3o0 diameters, 



movmo- by means of two flagelliform fila- 

 lueuts, aud aggregated into spherical revol- 

 ving clusters. 



JJ. viresceiis (PI. 32. fig. 18). Bodies 

 ovate, rounded at each end, with two lateral 

 bright green bands. Diameter of clusters 

 1-288", length of bodies 1-2016" ; fresh- 

 water. 



The life-cycle of a cercomonad. — One of 

 the Uvellce has been described by DaUinger 

 and Drysdale. When mature it multiplies 

 by fission for a period extending over from 

 two to eight days. It then becomes pecu- 

 liarly amoeboid ; two individuals coalesce, 

 .slowly increa.se in size, and become a sUghtly 

 distended cyst. The cyst bursts, and incal- 

 culable hosts of excessively minute sporides 

 are poured out, as if in a viscid fluid and 

 densely packed ; these are scattered, and 

 slowly enlarging, acquire flagella. They be- 

 come active, attain rapidly the parent form, 

 and once more increase by fission. 



BiBL. Dallinger and Drvsdale, Mn. Mic. 

 Jn. 1873; Ehr. hif. 19;' Duj. Inf, 300; 

 Kent, Inf. 406. 



UVICtERI'NA D'Orb.— a genus of hya- 

 line Foraminifera, near Poh/morphina, Shell 

 made up of three series of inflated chambers, 

 alternating irregularly on an elongate spire, 

 often ribbed ; orifice central, round, tubular, 

 and lipped. The triserial alternation passes 

 sometimes into a biserial and even a uni- 

 serial growth (Sar/rina, restricted). Um/e- 

 rina is world-wide in its distribution, and 

 goes back to the Middle Tertiary I'eriod. 



U. pygmcsa (PI. 23. fig. 8). 



BiBL. D'Orbigny, Ann. Sc. Nat. vii. 209 ; 

 Carpenter, For. 169 ; Parker & Jones, riiil. 

 Tr. clv. 363. 



V. 



VAGINIC'OLA, Lamarck.— A genus 

 of Peritrichous Infusoria, fani. Vorticellina. 



Char. Bodies as in VorticeUa, single or 

 in pairs, in a membranous urceolate sessile 

 sheath. 



V. crystallina (PI. 32. fig. 19) = Cofhurma 

 crystallina. Sheath crystalline, urceolate, 

 straight, internal granules green ; length 

 1-216". 



Several species, salt and freshwater. 



BiBL. Ehr. Inf. 295 ; Clap. & Each. Inf. 

 126. 



_ VAGINULI'NA, D'Orb.— A Stichoste- 

 gian subgenus of Noclosarina, with oblique 

 chambers. 



V. hadenensis, D'Orb. (PI. 23. fig. 35). 



BiBL. Willia-mson,7<b?-«?«.21(Z>ento/zV?a) ; 

 Jones, Parker, aud Brady, Monoyr. For. 

 Crar/, 63. 



VALKE'RIA, Flem.— A genus of In- 

 fundibidate Ctenostomatous Polyzoa, of the 

 family Vesicular iidse. 



Char. Variou.sly branched ; cells oval, 

 irregidarly clustered ; eight tentacles, but 

 no gizzard. 



V. cuscnta. Stem with subverticillate 

 branches ; cells in clusters or opposite pairs ; 

 on marine Algae, shells &c. 



F. uva. Stem creeping, irregularly 

 branched ; cells scattered. 



V.jyustulosa.  Dichotomous or alternately 

 branched ; cells clustered, imilateral. 



V. tremella. Cells very small and slender. 



BiBL. Johnst. Br. Zooph. 373 ; Gosse, 

 Mar. Zool. ii. 20; Hiucks, Poh/z. 551. 



VALLISNETtIA, Mich.— An aquatic 

 genus of Angiospermous Flowering Plants, 

 belonging to the faniUy Hydrocharidacece. 

 V. sjnralis, a native of the South of Europe, 

 occurring wild also in North America, India, 

 &c., is commonly grown in jars for the sake 



