OF THE KOLPODEA. 



637 



transparent. Amongst Lemnse. 1-120" 

 to 1-96". 



A. Fasciola ( Vibrio Anas, Fasciola, et 

 intermedius, Paramecium Fasciola, M.) 

 (XXIV. 314-316 ; xxix. 19, 20).— Wliite, 

 depressed, linear, lanceolate, convex 

 above, flat beneath. Wlien viewed from 

 above, from ten to twelve longitudinal 

 rows of delicate cilia may be seen, and 

 in the middle of the body two round 

 nuclei, and behind them a contractile 

 vesicle (xxiv. 314, 315, 316). In infu- 

 sions, in marshy ponds, &c. Perty states 

 that he has found it at an elevation of 

 5000 feet on the Alps, and also beneath 

 the ice. Cohn has watched its power of 

 encysting itself. (Siebold's Zeitschr. 1854, 

 V. p. 430). 1-720" to 1-144". 



A. 3Ieleagris {Kolpoda, M. ; Loxophyl- 

 liim 3Mcagris, D.). — Large, compressed, 

 membranous, broadly lanceolate in 

 shape, with the crest of the back denti- 

 culated. The colour of this interesting 

 animalcide is white. On the under side 

 there is a more or less distinct row of 

 eight to ten bright colourless spots. 

 These spots are, however, in no constant 



number, as Ehrenberg supposed ; for they 

 are nothing more than coloured-food 

 vacuoles, which sometimes completely 

 fill the animalcule. With Lemnae. 

 1-72". (See notes on Nassula, p. 625.) 



A. longicollis (Kolpoda ocJirea, Trichoda 

 Felis, M.). — Dilated ; turgid posteriorly ; 

 attenuated and elongated anteriorly, like 

 a sword. Amongst Lemnae. 1-120" to 

 1-96". 



A. (?) papillosas. — Depressed, lanceo- 

 late, fringed with papiUie ; tail and pro- 

 boscis smooth. Amongst Confervae. 

 1-600" to 1-430". 



A. Sphagni. — Depressed, linear or 

 linear-lanceolate ; proboscis truncate 

 and keeled ; tail acute ; fringed with 

 cilia on one side ; green corpuscles oc- 

 cupy the centre, leaving the extremities 

 of the body colourless or hyaline. 1-48" 

 to 1-12". Proboscis is one-fourth the 

 length of the body. Nucleus ovate; 

 cilia disposed spirally. Vacuoles some- 

 times enclose Bacillaria. Ovules (?) 

 large. Approaches A. Fasciola in general 

 characters. On submerged Spliagnum. 



Genus UROLEPTUS (XXY. 333).— Fm^nished with a tail; eye-speck, 

 tongue-like process, and proboscis absent. Locomotion effected by the cilia, 

 which cover the body, and are, in three species, evidently disposed in rows. 

 Numerous vacuoles and a mouth have been demonstrated by coloured food ; 

 but a discharging orifice has not been satisfactorily determined. Green- 

 coloured granules are e^ident in two species, but no nucleus or vesicle. 



This genus of Ehrenberg (says M. Dujardin), judging from the figures of 

 most of its species, should be in part united with O.vgtricJia. Thus Uroleptus 

 Piscis seems identical with Oxytriclia caudata (Duj.) ; U. Musculus (Ehr.) is, 

 in figure, an Oxytricha ; whilst U. (?) Lamella is probably a Trachelius, and U. 

 Filiim is rather allied to Sj^irostomum amhiguum. If these views be correct, 

 Uroleptus should be erased from the list of genera. Three species counted in 

 this genus by Ehrenberg are rejected from it by Perty, and allied with Oxy- 

 tricha, — \\z. U. Musculus, U. Piscis, and U. Lamella. 



UnoLEPTUS Piscis (Trichoda Piscis, 

 M.). — Green ; in figure like an elongated 

 top, gradually attenuated posteriorly, 

 forming a thick tail, covered with cilia, 

 those at the mouth largest. Found, in 

 February and March, amongst the 

 floccose bro-WTi coat upon dead sedge- 

 leaves, along with Chlamydomonas and 

 Cryptomoncis. Hampstead ponds. 1-288" 

 to 1-44". 



Perty doubts if there is any real di- 

 stinction between this animalcule and 

 the Oxytricha caudata (Ehr.). 



U. Musculus {Trichoda Musculus, M.) 

 (xxY. 333).— ^^Tiite, cylindrical, pear- 

 shaped, thickened posteriorly, where it 

 abruptly terminates in a "^tail. The 



movement rolling. It is inactive and 

 rigid. With Oscillator ice. 1-220". 



L^. Hosjjes. — Greenish, ovate-oblong 

 and turbinate in shape ; obliquely trun- 

 cated and exca^'ated anteriorly { poste- 

 riorly terminated by a styliform acute 

 tail. In frog- and snail-spa^Nii. 1-240". 



U. (?) Lamella. — Transparent, linear- 

 lanceolate, depressed, flat, very thin. In 

 infusions. 1-220". 



U. Filum {Enchelys caudata, M.). — 

 White, filiform, cylindrical ; rounded 

 anteriorly ; attenuated posteriorly, form- 

 ing a straight long tail. It is considered 

 a Spirostomum by Dujardin and Perty 

 {vide ante, p. 623). In stagnant spring- 

 water, kc. 1-48". 



