Ophrydina.'] infusorial animalcules. 549 



Vaginicola Ampulla. — ]\riillcr dcsoribcd this as larger than inost 

 animalcules dwelling in a bottle-shaped sheath, very contractile, grev, 

 and soft, and occupying various positions within the case. Found 

 in the Baltic, and, by Mr. Brightwell, at Lowestoff. 



V. ovata (Duj.) — Body of a lengthened ovoid figure, placed in an 

 urccolate case. Length of body 1- 1000th, of case 1 -550th. Appa- 

 rently distinct from V. crystallina. Found on Zygnema in pond w^ater. 



V. .'' (Brightwell). — Body double, of a green colour. 



Probably undescribed. Found on duck weed and other small aquatic 

 plants. It is doubtfid. whether this being is other than a Vaginicola 

 in process of spontaneous fission. 



Genus Cothurnia. Tlie stilt little hell Animahules possess divisbility 

 of the body, hut not of the lorica, which is urceolate in shape, and 

 supported on a rigid pedicle. A wreath of cilia is placed upon the 

 flat frontal region ; and the mouth, joined with the anal opening, lies 

 sideway within it. The body is elastic, and can withdraw itself 

 within the stifi" lorica ; polygastric apparatus and longitudinal self- 

 division have been observed in two species. The sexual structures 

 ai'e not satisfactorily seen. 



C. imberlis ( Vorticella folliciilata, M.) — Pedicle much shorter than 

 the lorica, the body of a yellowish colour. Ehi'enberg remarks, 

 " This animalcule had often swallowed green Monads, and yet 

 accepted indigo. TricJwdina vorax is the enemy of this species.'' 

 Found upon Cyclops quadricornis. {Mic. Cab., plate viii. group 257.) 

 Length of lorica 1 -280th. 



C. maritima. — Pedicle much shorter than the hyaline lorica; body 

 hyaline and whitish. Length of lorica l-570th. 



C. Uavniensis. — Pedicle much longer than the hyaline lorica; 

 body whitish. Size, without the stalk, 1 -280th 



Family.— ENCHELIA. 



We now arrive at Infusoria which possess a much higher organiza- 

 tion than those hitherto described, having a distinct alimentary 

 canal, with a mouth and cHscharging opening at opposite extremities 

 of the body. These animalcules are destitute of lorica ; organs of 



