576 DESCRIPTION OF [ Poli/gastrico . 



anterior or top of the brow runs a long ciliated furrow. Figures 

 297 and 298 represent this creature. In swimming they extend 

 themselves, and are thus readily perceived by the naked eye. Found 

 in ditches, among decaying oak leaves and rotten wood. Length 

 l-12th; ova 1-12000. It is visible to the naked eye. 



Genus Phialina. The hottle Animalcules have the frontal ciliated 

 portion separated from the body by a consbiction, forming a sort of 

 neck ; body destitute of cilia ; mouth lateral, and devoid of teeth. 

 The motion of these creatures is produced by the "vibration of the 

 powerful wreath of cilia over the mouth. Ehrenberg says cilia may 

 be present upon the surface of the body, as Miiller saw them in 

 Trichoda mellitea. The propagative organs are green or white ova 

 granules, and a contractile bladder (perhaps two), situated poste- 

 riorly. Self- division probably ti'ansverse. 



P. vermicularis {Trichoda vermicula/ris, M.) — Body egg-shaped, 

 attenuated anteriorly, neck very short ; colour white, caused by its 

 ova. Found with Lemna. Size 1 -240th. 



P. viridis. — Body bottled-shaped, anterior part acute, the poste- 

 rior gradually attenuated; neck very short, (f. 299.) Length 

 l-280th. 



Genus Glaucoma. The pearl Animalcules. — Body oval, compressed, 

 covered with cilia ; mouth provided with a tremulous flap, but no 

 teeth. The reception and discharge of food, and the presence of 

 digestive cells, indicate, according to Ehrenberg, the existence of an 

 alimentary canal. The large mouth, with its vibratory valve, is 

 situated on the inferior side, near the middle. The reproductive 

 organs are a large ovate gland, a star-like contractile bladder, and 

 ova granules. Self-division transverse or longitudinal. 



Glaucoma is comprised by Dujardia among his ' Parameciens.^ 

 G. scintillans {Cyclidium bulla, M.) — Body elliptical or ovate 

 colourless, slightly depressed ; ventricles large. The vibrating flap 

 appears to be a semi-oval proboscis, with stifi' margin. The cilia 

 are seen by employing colour, or by pressing or drying them. 

 Figures 300, 301, and 302, represent different views of this crea- 

 ture ; the latter shows it while undergoing transverse self-division. 

 Found both in natural and artificial infusion. Size 1 -280th. 



G. viridis (Duj.) — Body green, oval, short, mouth large, situated 



