622 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



B. lateritia (T?'ichoda ignita, M.). — colour. With Lemnae, ConfeiTse, &c. 

 Compressed, ovato-triangular, with the 1-430" to 1-144". 

 front sharply crested, of a brick-red 



b. Frontonia. — Anterior 'part of the body (hroiu) irrojeds beyond the mouth, 



and is convex. 



B. vernaUs (Leucophra vi7'escens,'M.). — 

 Oval, tiu'gid, rounded at the ends, and 

 attenuated posteriorly. The mouth has 

 a wreath of stiff, short bristles, resembling- 

 teeth ; nimierous digestive vacuoles are 

 often fiUed wdth large Oscillatoriae, Na- 

 viculge, &c. (and contain a reddish bile, 

 Ehr.). The progressive digestion of the 

 OsciUatorise is interesting to follow : — 

 they are at first elastic and rigid, and of 

 a beautiful blue-green colour, then di- 

 stinctly lax, flexible, and bright green, 

 becoming afterw^ards yellowish green, 

 and resolved into separate segments, 

 which at length turn yellow. Amongst 

 Oscillatoriae in spring. 1-144" to 1-120". 



B. leucas (xxiv. 295 -, xxx. 1). — Ob- 

 long, cylindrical; extremities nearly equi- 

 convex (bile colouiless). This creature 

 has a contractile bladder, with a cmious 

 j agged margin near the long open mouth. 

 With Oscillatoriae, and on the surface of 

 water. 1-144". 



B. Fiqjci (xxiv. 296).— White, ovate- 

 oblong, rather acute posteriorly j mouth 

 inferior, and near the frontal apex (see 

 f. 296). 1-280". In chalybeate w^ater, 

 Germany. 



B. Jlava. — Ovate-oblong, often acute 

 at the posterior extremity; the mouth 

 occurs in the flat concavity immediately 

 behind the round brow. In bog- water. 

 1-140" to 1-96". 



^' This species," says Pei'ty, " differs 

 much, both in its flgm-e and its narrow^er 

 oral tissm'e, from true BuisaricB, and 

 ranges better with Pa/wphrys.^^ Dujar- 

 din, again, considers JB. jiava, B. leucas, 

 and B. vernalis to be merely three va- 

 rieties of his Panophrys farcta. 



B. {Opalina) Nucleus. — Small, white, 

 ovate, attenuated anteriorly; extremities 

 convex. In Rana toiiporaria and P. es- 

 culenta, 1-240". Vide notes on B. En- 

 tozoon. 



B. (Opalinci) Ranarum. — Ovate-lenti- 

 cular and compressed, subacute ante- 

 riorly; the back and belly carinated ; often 

 tnmcated posteriorly; mouth inferior, 

 near the frontal apex. 1-210" to 1-72". 



The mouth here described has been 



diligently sought for by Stein and others; 

 but they can find nothing more than a 

 fold of the surface, with no orifice in it, 

 as sho^Ti by reagents. This species is 

 therefore a member of the mouthless 

 group Opalinaea (vide subclass Opali- 

 n^a, p. 269, and Pis. xxn. 46, 47 ; xx^i. 

 28, 29). 



B. (?) aurantiaca, — Ovate-oblono-, an- 

 teriorly obtuse, posteriorly acute ; it has 

 an ash-colom-ed spot near the mouth. 

 Amongst OsciUatoiiae. 1-280". 



B. arhorum. — Oblong, compressed; 

 A'ery finely ciliated; ends rounded; mouth 

 situated in the anterior third of the body, 

 reaching its fi'ontal extremity; a wreath 

 of larger cilia extending around and 

 backw-ards from the mouth. Length 

 1-40"', double the breadth; vacuoles 

 nimierous, and tw^o globular nuclei seen. 

 On moss of trees. 



B. triquetra. — Ovate-lenticular ; very 

 finely ciliated ; dorsimi flat; venter tm-gid 

 and slightly keeled, hence an imperfect 

 triquetral figm-e of the animal ; anterior 

 extremity subtruncate ; oral flssm-e long, 

 extending from the frontal end, fi-inged 

 with a row of strong cilia extending 

 backw^ards; nuclei tw^o, smaU; vesicle 

 large, contractile, simple, near the pos- 

 terior extremity. Swims slow^ly. 1-36"'. 

 On moss of trees. 



B. Blattarum (Stein). — Is very like 

 B. cordiformis, but more compressed; 

 roimded in front, where there is a very 

 opaque, sharply-defined, coarse-granular, 

 and posterior to it the transverse oval 

 nucleus. In intestine of Blatta. 



B, patula (Duj. and Perty)=ieMCO- 

 pkrijs patula (Ehr.) ; Bursaria virens 

 (Perty) = Spirostominn virens (Ehr.) ; 

 and Bursaria spirigera. 



B. Loxodes ('Pertj) = Loxodes Bursaria 

 (Ehr.). — Under no circumstances can 

 this species (says Perty) be reckoned with 

 Loxodes (Ehr.), or wath Pelecida (Duj.). 



B. Ztimh'ici (Stein) = Plagiotoma Lum- 

 hrici (Duj.) = Paramecium compressum 

 (Ehr.) is a Bursaria, not a Parame- 

 cium, having a row of longer cilia about 

 the mouth and ventral sm-face. 



Genus SPIROSTOMUM (XXIV. 296*-298).— Body elongated, or ribbon- 

 shaped, flexible and ciliated, the frontal region continnous ; mouth lateral, 

 spiral-shaped, devoid of teeth, but with a tremulous flap. The locomotive 



