500 



SYSTEMATIC HISTOEY OF THE INFXJSOKIA. 



Monadina generally, must be found in order to constitute the Heteromita 

 members of that family, — such as the absence of integument, the gelatinous 

 appearance of the entire mass admitting of agglutination to other objects, 

 and the drawing out of its substance into filamentous processes, together with 

 the existence of certain corpuscles, which can only have penetrated the inte- 

 rior as a consequence of the formation of vacuoles at the surface " (Dnj.). 



Heteromita ovata (xxvi. 6). — 

 Ovate, narrower anteriorly, containing 

 vacuoles, granules, and Naviculse. 

 1-1050" to 1-1150". 



This is probably the Bodo granclis of 

 Ehrenberg. His other Bodos are not 

 HeteromitcB, but imperfectly-observed 

 Cercomonads or Amphimonads. 



H. Gramdum. — Globular, surface gra- 

 nular. 1-2600". In rather putrid sea- 

 water. 



H. angusta. — Narrow, lanceolate, 

 slightly bent, tapering at each end, with 

 a flag'elliform and a second filament from 

 the same point anteriorly, erect at the 

 base, but floating freel}^ the rest of its 

 length. 1-1050". 



This is a doubtful species ; it is of the 

 shape of a lanceolate leaf, wUh. a mid- 

 rib or longitudinal fold. 



The following species are from Perty's work :- 



H. pusitla. — ^^Colourless, very delicate, 

 cylindrical or Euglena-like in figm-e, 

 constricted at the centre, often eniargi- 

 nate posteriorly ; filaments 2 to 2^ times 

 longer than the body ; movements in- 

 active, oscillating ; few fine gTanules in- 

 ternally. 1-3000" to 1-2160". AlHed 

 to, but smaller than, H. migusta, and 



like Amphimonas dispar, in which, how- 

 ever, both filaments are equal. In ponds 

 at Thun. 



H. exigua. — Oval or spheroidal, co- 

 lourless ; filaments about three times 

 the leng-th of the bodv ; movements in- 

 active. 1-7000" to 1-4800". In turf- 

 hollows on the Bernese Alps. 



Genus TEICHOMONAS (D.) (XVIII. 28).— Body ovoid or globular, capable 

 of being drawn out when adherent, and in this way presenting sometimes a 

 caudal prolongation. The anterior flageUiform filament is accompanied with 

 a group of vibratile cilia. 



turning on its axis. 1-1730". Found in 

 the intestine of Limax agrestis. 



T. Batrachiormn (Perty) (x\Tni. 28 a, 6, 

 c, d). — Widely oval, at times slightly 

 emarginate in front, mostly with a keel 

 along the back, colourless, and 8 to 10 

 cilia on the left side; resembles T. 

 Liimicis, but is more finely granidar. 

 1-2400" to 1-1300". 



Trichomonas vaginalis. — Gelatinous, 

 nodular, unequal, hollowed by vacuoles, 

 often adhering to other bodies ; nwve- 

 mcnt oscillating. 1-2600". 



T. Limacis. — Ovoid, smooth, pointed 

 at each end, and terminating in front by 

 a flageUiform filament, from the base of 

 which a row of vibratile cilia is directed 

 backwards ; progressive movement act- 

 ive, the animalcule at the same time ] 



Genus ANTHOPHYSA (D.) (XXYI. 2). —Animals ovoid or pyriform, 

 furnished with a single flageUiform filament, and collected in clusters at the 

 extremities of a branching stem, or polypidom, secreted by themselves; clusters 

 when detached resembling those of Uvella. 



The tree-like polypary is brown at the base, but clearer and even dia- 

 phanous at the termination of the branches, which appear nodular. The 

 groups of animalcules are easily detached from the stem, and then commence 

 a rotatory movement by the action of the filaments of each individual in the 

 group. Detached solitary animalcules move like the common monads with a 

 single filament. The branching support, at first soft and gelatinous, becomes 

 by degrees more consistent, brown, and of a horny character, appearing to 

 partake no longer of the vitality of the animalcules. 



A. Mulleri Avas erroneously placed by Ehrenberg in the genus Epistylis, 

 among the YorticelUna, and called E. vegetans. 



The delicate branched fibre or stem has been considered a microscopic 



