536 ORDER HOLOTRICHA. 



HAB. Pond water and vegetable infusions in company with Cyclidium 

 glaucoma. 



This species, in common with Enchelys farrimen, is one of the most abundant 

 Ciliate types developed in hay and other vegetable infusions, the attraction 

 there being the abundant harvest of monadiform animalcules upon which it in 

 like manner feeds voraciously. The cuticular surface in this animalcule is exceed- 

 ingly soft and flexible, permitting it to assume the most protean contortions as it 

 forces its way among the vegetable debris contained in the infusion. When swim- 

 ming freely in the water, it moves swiftly forwards or backwards in a straight line, or 

 progresses leisurely, mouth downwards, after the manner of an Enchelys. 



Trichoda carnmm, Ehr. sp. 



Body elliptical, slightly narrower anteriorly, rather over twice as long as 

 broad, the oblique oral fossa of considerable dimensions ; oral and cuticular 

 cilia conspicuous ; contractile vesicle single, postero-terminal ; endoplast 

 subcentral, spheroidal ; colour white. Length 1-430". 



HAB. Animal macerations, and water from dung-hills. 



This species is identical with the Leucophrys carnium of Ehrenberg. 



Trichoda pirum, Mull. sp. 



Body pyriform, widest posteriorly, narrowest and pointed anteriorly, 

 twice as long as broad ; cuticular and oral cilia conspicuous, oral fossa not 

 so distinct as in T. carnium; colour white. Length 1-1250" to 1-400". 



HAB. Pond water, with Euplotes charon, and Polytoma uvella. 



This animalcule is apparently identical with the form first described by Bory de 

 St. Vincent under the name of Enchelys pyriformis, and since referred by Ehrenberg 

 to the genus Leucophrys. It was originally figured by O. F. Miiller under the title 

 of Kolpoda pirum. It would seem highly probable, as already suggested by Dujardin, 

 that Ehrenberg's Trichoda carnium must be also accepted as a synonym of this 

 species. 



Doubtful Species. 



The four following species, referred by Ehrenberg to the genus Trichoda, are too 

 meagrely described for present identification. No evidence as to their possessing 

 vibratile oral membranes being recorded, they might with equal justice be referred 

 to the genus Enchelys. 



Trichoda nasamomum, Ehr. Body cylindrical, extremities equally obtuse ; mouth 

 large, elongated laterally. Length 1-288". 



Trichoda ovata, Ehr. Body ovate, turgid, attenuated anteriorly ; mouth small, 

 lateral. Length 1-480". HAB. Egypt. 



Trichoda (?) athiopica, Ehr. Body oblong, attenuated posteriorly; under side 

 flat ; mouth large. Length 1-600". 



Trichoda asiatica, Ehr. Body oval, oblong, cylindrical, rounded at both ends ; 

 mouth small. Length 1-800". 



The Trichoda angulata of Dujardin thus defined : Body oblong, obliquely 

 angular, often containing one or more superficial vacuoles. Length 1-300". 

 Inhabiting water with decaying plants is apparently, from the figure given, allied 

 to or identical with Colpoda cucullus. 



GENUS V. LEMBADION, Perty. 



Animalcules free-swimming, persistent in form, more or less ovate, 

 entirely ciliate; oral fossa terminal, capacious, its right side supporting 



