INFUSORIA. 



INFUSOUIA. 



spiral pk 

 Oms4 



*MUnav 



t ftifonn, or fill- 



~. :: -.: v. 







cylindrical or fusiform, and 



scxMrtMMoasly dividing iUelf 



in laoptodiaU or oblique 



direction. 



A. No TwUgM of eyes. 

 Oenus AHatia. 



A Piquet rudimentary eyes, 

 ft. One eye. 

 AUiL 



:. .-.-/ .. 

 XotsjL 



Genus .4WyopAi'. 

 U. Two eyes. 



Genus Duliffma. 



Section i 



Body ciliated ; mouth ciliated or nude ; no psendo pediform 

 prolongations. 



Epilridta undo. 

 Family 4. Cfdadina. 

 A. Body with vibratory cilin. 

 . CUiat in aimple row*, lotigitu- 

 tudinal or drooler. 



ma. Cilic scattered. 



Qtam famtttridmm. 

 B. Body deprived of cilisr, 

 furnished with bain 

 Tibntile. 

 Oeniu duztomoma*. 



Kpilrifha lorieata. 

 Family ^.Peridina. 



A. Simple. 



Genus Peridinium. 



B. Compound, reproduced by in- 



terior division and rupture 

 of the envelope. 

 6. No eyes. 



but Envelope compressed, 

 not Genus (ionium. 



Envelope globular. 

 t Ciliated. 



Genus I'o/rox. 

 tt Tentaculated. 



Genus Spkarotira. 

 66. With eyea. 



Genus Eitdorina. 



Section 8. TViK/ojxx/ia. 

 Body furniabed with variable peeudo pediform prolongations. 



Pmdtpedia Wo. Pieudopodia lorieata. 



Family 6. Amaba. Family 4.BaciUaria. [DlATO- 



Genus A*utta. MACUL] 



The envelope dividing with the 

 animal 



A. Free, never fixed. 



a. Solitary or agglomerated. 

 * Envelope oblong. 



Genus AorifWo. 

 * Envelope wider than long. 



Genus Kuattrum. 



aa. United in form of riband*, 

 polymorphous ; the indivi- 

 dual* of the group have some 

 freedom of movement with- 

 out becoming detached ; cui- 

 rass equally thick throughout, 

 and prismatic. 



QtoMAsjOMft 

 aaa. United in bundles, and not 

 polymorphous, afterwards 

 disunited. 



Oenus Fragillaria. 

 nnnn. United in a fan shape, with- 

 out foot; cuirass thicker in 



(: ',:'. 



Oenus Exilaria. 



B. Fixed when young, afterwards 



free. 



6. Sessile. 



Genus Synrdra. 



W. Pedicellated, often dichc- 

 tomous by ramification ; 

 body reduced below, cunei- 

 form. 



Oenus Comphmtma. 



666. Pedicellated, often dichoto- 

 mous; body contracted to- 



wards each extremity, snb- 

 fiuiform. 



Genus Coeeonema. 

 6666. Pedioellated, united in n fan 

 nhape, and often dichoto- 



I110UB. 



Genus BckvuUa. 



Family 5. Arcdliaa. 

 Envelope undivided. 



A . Envelope urceolate. 



Oenus Diflwjia. 



B. Envelope ncutclliform. 



Genu* Aretlla. 



1. Diat*ma tulfarit ; it, natural nine ; b, e, marnited. 2. Diatomn Stcartzii, 

 magnified ; , end riew. 3. FragUlaria tuiipvxctata, magnlflcd. 



Legion 2. Enltrodtla, 



Mouth and anus dUtiuct, opening into an intestine, round which 

 are grouped the stomachal vesiculi. 



Section 4. Anopittltia, 

 Mouth and anus contiguous. 

 Anopitthia nutla. 

 Family . rorlietllina. 

 A. Body pedicellated, fixed, after- 

 ward* detached, becoming 

 often dichotomous. 

 a. Pedicle simple or branched, 



contracting into a spiral. 

 * Pedicle solid, the interior muscle 

 indistinct. 



Oenus rorlietlla. 

 " Pedicle tubular, the interior 

 muscle often distinct, be- 

 coming arborescent by the 

 spontaneous divisions of the 

 animal. 



t Animalcula of the same group 

 similar. 



Genus Ccurchaivm. 

 ft Animalcula dissimilar in the 

 same group. 



Genus Zooeladium. 

 no. Pedicle not contracting in 

 spiral, rigid, with no interior 

 tube. 



Genus Epittylit. 



n. Body not pedicellated and free. 

 6. Cilite in a single crown. 

 Genus Trichodina, 

 66. Cili.T in a spiral row con- 

 ducting to the mouth. 

 Oenus Stntor. 



loncaia. 

 Family 6. Opkrydina. 



A. Body surrounded by gelatine 



and not pedicellated. 

 Genun Ophrydium. 



B. Body inclosed in a membranous 



sheath. 



6. Pedicellated. 

 Sheath sesxile. 



Genus Tintinnut. 

 " Sheath pelicellsted. 



Genus t'litliurnia. 

 66. Not pedicellated. 



Genus Vayitiicola. 



