BURSARINA. 



[ 103 ] 



BUXBAUMIACE.E. 



water ; some in the intestines of the frog and 

 Nais. 



B.vernalis(Panophrys,D.) (PI. 23.fig. 19). 

 Body ovate-oblong, turgid, green, rounded at 

 each end, somewhat narrowed posteriorly, 

 the mouth placed behind the anterior third 

 or fourth of the body; aquatic; length 1-130 

 to 1-110". 



B. ranarum (Opalina ranarum) (PI. 24. 

 fig. 47). Body ovate, lenticular, compressed, 

 large, white, the dorsal and ventral surface 

 keeled, anterior part subacute, often truncate 

 posteriorly, mouth inferior, near the anterior 

 pointed end; length 1-210 to 1-70". In the 

 intestines of the frog. 



The genus Bursaria of Dujardin, agrees 

 in part only with that of Ehrenberg. The 

 characters given are, 



Body ciliated, ovoid, usually broader and 

 rounded behind, with a large mouth, obliquely 

 situated at the end of a row of cilia arranged 

 spirally and arising from the front end. 



It contains six species of Ehrenberg's 

 genus, as well as the Leucophrys patula and 

 sanguined, Spirostomum virens and Loxodes 

 Bursaria of Ehrenberg. 



BIBL. Ehrenb. In/us.; Duj. Infus.; Stein, 

 Die Infus. auf ihr. Entwickel. 



BURSARINA,Duj. Afamilyoflufusoria. 



Char. Body very contractile, of variable 

 form, usually oval, ovoid or oblong, ciliated 

 all over ; a large mouth surrounded by cilia 

 forming a fringe or arranged spirally. 



Dujardin recognises five genera : Plaai- 

 otoma (Paramecium compressum, E.) ; Oph- 

 ryoglena, E. ; Bursaria (E. in part) ; Spiro- 

 stomum, D. ; and Kondylostoma, D. 



BIBL. Duj. Infus. 



BUTTERFLIES. See LEPIDOPTERA. 



BUXBAUMIACE^.-A family of oper- 



Fig. 88. 



Fig. 89. 



Fig. 90. 



Buxbaumia aphylla. 



Fig. 88. A. male antheridiferous plant, magnified 40 

 diameters. 



Fig. 89. An autheridium burst and discharging sperma- 

 tozoids, magnified 100 diameters. 



Figs. 90, 91 and 92. Archegoniferous plant, in different 

 stages, magnified 40 diameters . 



Fig. 91. 



Buxbaumia apbylla. 



Fig. 92. 



Fig. 93. 



Fig. 93. A young fertile plant elevating its sporange, 

 covered by the calyptra, magnified 15 diameters. 



Fig. 94. 



Fig. 95. 



Fig. 96. 



Fig. 94. A ripe capsule, magnified 15 diameters. 



Fig. 95. A plant in which the capsule has burst and lost 

 the spore-sac, &c., magnified 15 diameters. 



Fig. 96. Spore-sac exposed by removal of the wall of 

 the capsule, showing the filaments by which the spore-sac 

 is suspended within the latter, magnified 40 diameters. 



culated Acrocarpous Mosses, of very dwarf 

 stemless habit, arising from a minute tuft of 

 radical filaments (figs. 88, 90, &c.). The leaves 

 are small and flat, composed of few minutish, 

 hexagonal or polygonalparenchymatous cells, 

 empty, destitute of chlorophyll (fig. 90) . The 

 capsule (fig. 94), seated on an elongated, 

 thick, fleshy and very scabrous stalk, is more 

 oblique than in any other Mosses, very ven- 

 tricose on one side, obliquely erect on the 

 other, dorsal side, cup-shaped at the base, 

 articulated on its stalk, fungoid in general 



