OF THE MONADINA. 



491 



M. procUyiosa. — A very minute red 

 Monad, so named by Ehrenberg- from 

 its sm-prisingly rapid development. It 

 is tliis animalcide wbich has produced 

 the blood-like spots occasionally appear- 

 ing mysteriously on bread and other 

 ist nimibers in the saltmarsh-Avater ' farinaceous substances, and which have 



tion vacillating. In stagnant and foul 

 water. 1-3600". 



M. scintillam. — Fusiform, very active ; 

 motion vacillating. Amongst fresh- 

 water Conferv£e, &c. 1-6000" to 1-4600". 



M. Dumalii. — Of a deep red colour : 



of the Mediterranean, to which they 

 give a deep blood-colour. Discovered 

 by M. Joly. 



ever been a cause of ten'or to the super- 

 stitious. Cohn asserts this organism to 

 be a Vibrio, and not a Monas, 



Being desirous of making this manual as complete as possible, the following 

 species, described by M. Dujardin, are inserted ; but it may be that some of 

 them refer to Monads akeady characterized, but differently named. 



M. Lens (x^^^. 10, 21). — Roimded or 

 discoid 5 surface in appearance tuber- 

 cidar. 1-5200" to 3-5200". This spe- 

 cies, one of the most frequent in animal 

 or vegetable infusions, has been recog- 

 nized by most of the ancient microgra- 

 phers. It sends out obliquely a flagel- 

 lifomi filament, three, four, or even five 

 times as long as the body, and mobile in all 

 its length. Probably =M. Guthda(Ehx.). 



M. concava. — Circular, concave on one 

 side, thin in the centre, margin tumid ; 

 filament long, moveable throughout. In 

 marsh water, Toulouse. 1-2080". 



Isl. ghhidosa (x%Tn. 17). — Globular; 

 form mostly constant; compressed at 

 origin of filament ; more globular than 

 M. Lens, and its sm'face smooth. In sea- 

 water at Cette, France. 1-2000". 



M. elongctta. — Elongate ; nodidar, 

 flexible, of vaiiable form. 1-1200". 

 In marsh -water. 



M. attenuata (xvni. 19). — Ovoid, ta- 

 pering at each extremity, nodidar, va- 

 cuolse large and distinct, as is also its 

 filament. 1-1660". 



M. oblonga. — Ovoid, oblong, unequal, 

 tubercular, hollowed by vacuolae. 

 1-3600". In veo-etable infusions. 



M. nodosa. — Oblong, irregular, nodose, 

 tapering behind, truncate in front, fila- 

 ment arising from centre of truncate ex- 

 ti-emity. 1-2170". In sea-water at 

 Cette, France. 



M. gihhosa. — Oblong, angular, irregu- 

 larly distended and gibbose ; filament 

 springing mostly from an anterior con- 

 striction. Length 1-2000". In infu- 

 sions of gelatine. 



M. varians. — Oblong, narrower in 

 fi'ont, very soft, and variable in form. 

 1-650" tol-700". 



M. intestinalis. — Yerj elongated, form 

 constantly changing, or one end rounded, 

 the other tapering to terminate in a long 

 filament ; motion imdulatory. 1-1600". 

 Found in the excrement of a newt 

 (^Triton palmipes). '^I think this is one 

 of the species of Bodo, described by 

 Ehrenberg as met vnth. in the intestines 

 of frogs" (Duj.). 



M. jiuida., — Soft, semifluid; form 

 variable, iiTegularly ovoid, sometimes 

 constricted posteriorly, hoUowed by large 

 vacuoles. 1-2600". 



M. constricta. — Elongated, four or five 

 times longer than broad ; constricted, 

 often much so at the centre. 1-1300". 



Pertyhas distinguished the following Monadiform beings by specific names: — 



rarely pointed behind ; colom-less, trans- 

 parent, with large vacuoles ; filament 

 twice the length of body; movement 

 active and revolving. In water contain- 

 ing decomposing Anodonta, and foul 

 pond-water. 1-1800". 



M. cordata. — Cordate seen on one 

 side, on another oval and ti'uncate ; 

 rounded anteriorly ; hyaline or greyish 

 from internal granules ; swims tolerably 

 fast with an oscillating motion, and sel- 

 dom revolves ; occurs singly and not 

 often; filament extremely difiicult to 

 see, more than double the length of the 

 body. 1140" to 1080". In freshwater 

 ponds. 



MoNAS curvata. — A variety of 3L 

 Lens ; tapering posteriorly. 



M. astasioides. — Of variable form, often 

 with one or two longitudinal lines, and 

 a central vacuole. 1-1340". 



M. irregularis. — more or less globular, 

 sometimes with capillary or angidar pro- 

 cesses; nimierous dark internal mole- 

 cules. 1-2000" to 1-1250". In ponds, 

 Beme. 



M. pileatorum. — Irregularly oval ; 

 pointed anteriorly; colomiess; motor fila- 

 ment short, scarcely 1^ times the length 

 of the body ; movement sluggish; nearly 

 resembles M. socialis. 1-1400". 



M. SHccisa. — Oval ; usually truncate. 



