300 DESCRIPTION OF [Polygastrica. 



neck, body destitute of cilii, mouth lateral, and devoid of 

 teeth. The motion of these creatures is produced by the 

 vibration of this powerful wreath of cilii over the mouth. 

 Ehrenberg says cilii 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 posteriorly. 

 Self-division probably transverse. 



492. PHIALINA vermicularis (Trichoda vermicularis, 

 M.) The white Phialina. Body egg-shaped, attenuated 

 anteriorly, neck very short. The white colour of this 

 animalcule is caused by its ova. Found with lemna. Size 

 1 -240th. 



493. PHIALINA viridis. The green Phialina. Body 

 bottled-shaped, anterior part acute, the posterior gradually 

 attenuated, neck very short. (Fig. 299.) Length l-280th. 



Genus CXV. GLAUCOMA. The pearl Animalcules are 

 characterized by having the body covered with cilii, and a 

 mouth provided with a tremulous flap, but no teeth. The 

 reception and discharge of food, and the presence of diges- 

 tive cells, indicate, according to Ehrenberg, the existence of 

 an alimentary canal. The 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 trans- 

 verse or longitudinal. 



494. GLAUCOMA scintillans (Cyclidium bulla, M.) The 

 tremulous Glaucoma. Body elliptical or ovate, slightly 

 depressed ; ventricles large. The vibrating flap appears 

 to be a semi-oval proboscis, with stiff margin. The cilii are 

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



