OF THE OXYTEI CHINA. 639 



the latter, destitute of a contractile reticulated integument. The type of this 

 genus is the AmpTiileptus Anser of Ehrenberg ; and the A. margaritifer (Ehr.) 

 is also referable to it. 



DiLEPTUs Folium (Duj.) (xxvi. 26). 

 — Very flexible ; lanceolate, contracted 

 in front, -vsdth nodidar reticulated and 

 irregular stripes, like the veins of a 



leaf. In river- water. 1-175" to 1-130", 

 Perty remarks that this organism can- 

 not be a species of Dileptus. 



Genus LOXOPHYLLUM (Duj.) (XXVI. 32).— Very depressed, lameUar, 

 oblique, very flexible ; sinuous or undulated along the borders ; mouth lateral ; 

 cilia in wide parallel rows. 



Ehi'enberg has comprehended Loxopliyllum with Amphileptus. Perty 

 makes the separation. 



LoxoPHYLLUM 3Ieleagris, the type of 

 the crQ\\vis=^ Amphileptits 3Ieleagris(Fhr.^. 



The Trachelius Melcagris (Ehr.) pro- 

 bably represents also another Loxo- 



phyllum, as weU as the Kolpoda ochrea 

 of Miiller, which Ehrenberg states to 

 agree with his Amphileptus longicoUis. 



Genus PLEURONEMA (Duj. and Perty) (XXVI. 23), represented by 

 the Paramecium Chrysalis (Ehr.), is thus defined by Dujardin : — ''Body oval, 

 oblong, depressed ; having one large lateral orifice, from which a tuft of long, 

 floating and contractile filaments issues." It has nothing in common with 

 Paramecium, he adds, besides its oblong figure ; whilst the bundle of long 

 filaments has no analogy, except in the genus Alyscum. However, he places 

 it in his family Parameciens, whilst Perty introduces it as the sole represen- 

 tative of a family " Aphthonia," characterized as having, besides locomotive 

 cilia, other longer ones or filaments. 



Pleuronema crassum = Paramecium 

 Chrysalis (Ehr.). — Ovoid, much elon- 

 gated, rather depressed; with obtuse 

 ends ; finely striated. Lateral oriflce at 



the anterior fourth of the body, with 

 long filaments, some proceeding from 

 the border, others from the posterior ex- 

 tremitv. 1-120". In the Mediterranean. 



Genus OTOSTOMA (Carter, ^.A^^. 1856, xvii. 117) (XXVIII. 24^26).— 

 Body ovoid, of a light brown colour, covered with longitudinal lines of cilia. 

 Mouth ear- shaped, in a depression situated about the junction of the anterior 

 with the middle third of the infusorium ; buccal cavity broad, short, curved 

 do^vnwards, and a little upon itself outwards, plicated longitudinally in 

 parallel lines. Anus terminal ; gland or nucleus long, fusiform, situated 

 between the buccal cavity and the contracting vesicles, which are double 

 and connected with a set of vessels something like those of Parameciiun 

 Aurelia. 



" It is," adds Mr. Carter, " a Paramecium closely allied to NassuJa, and, 

 from the likeness of the oral orifice to the human ear, I propose for it the 

 name of ' Otosfoma.^ " Its cysts have been discovered on Nitella, and give 

 exit to monadiform beings approaching the parent Otostoma in form. 



FAMILY XL— OXYTBICIIIXA. 



(XXV. 336-344; XXVIII. 43-47.) 



Possess two separate alimentary orifices, neither of them situated at the 

 extremities, and are not encased by a de'nse integument (lorica). Their loco- 

 motive organs are various, consisting of set®, vibratile cilia, and non-vibratile 

 styles or uncini, variously situated, and render the creatures active. (Poly- 

 gastric cells, disposed upon an alimentaiy tube, were represented by Ehren- 



