50 THE ROTIFERA. 



SP. CH. Lobes five, linear, knobbed ; setae, non-extensile. 



The corona has five long narrow knobbed lobes, nearly all of equal length, sepa- 

 rated by deep depressions, and forming a miniature coronet. The dorsal lobe is slightly 

 the longest, and the lobes are so set on the front of the body that a plane touching the 

 knobs would be oblique to its longitudinal axis ; the dorsal lobe being the furthest 

 forward. All the knobs carry long radiating setae, and the setae are continued all along 

 the edge of the trochal cup (PI. II. fig. 2). The true ciliary wreath and the eyes have 

 been seen in the adult by Cubitt (loc. cit.} ; but the former with difficulty. The lateral 

 antennae can be readily seen when the animal is favourably placed, as well as the delicate 

 muscular threads by which the longitudinal muscles act on the corona (PL II. fig. 2). 

 As many as seven male eggs have been seen in one tube. 



Length, ^ inch. Habitat. In ponds and marsh pools ; rare. Wandsworth Common 

 (Cubitt) ; Forfar, Fife (J.H.). 



F. MIRA, Hudson. 



(PI. III. fig. 1.) 

 Floscitlaria mira .... Hudson, J. Roy. Micr. Soc. 2 Ser. vol. v. 1885, p. G09. 



SP. CH. Lobes fw e, linear, knobbed ; setae extensile. 



The corona is very like that of F. ornata, which species the Rotiferon closely resembles 

 in every respect but two. First, the tube is much more like that of a Stephanoceros than 

 that of an ordinary Floscule. I have seen only one specimen, but Mr. Cocks (its dis- 

 coverer) tells me that the tubes of the half-dozen specimens which he has seen were 

 all of the same sort. Secondly, in its setae F. mira is not only unlike all other Floscules, 

 but is unique among the Rotifera : for each seta is in constant independent motion, 

 slowly extending or contracting like the pseudopodium of an Amoeba. When the 

 retracted seta begins to extend again, it is often bent into a whip-like shape, a wave 

 of motion overtaking, as it were, the resting anterior portion, and finally driving out 

 the latter with a characteristic flourish of its tip. The setoa are of amazing length and 

 abundance, exceeding the total length of the Rotiferon. This very rare and wonderful 

 creature was discovered by Mr. W. G. Cocks in June 1884. 



Length, r ^ inch. Habitat. Unknown ; found in an aquarium, in water that probably 

 came from Epping Forest or Walton-on-Thames (W. G. Cocks). 



F. OKNATA, Ehrenberg. 

 (PI. I. fig. 9.) 



Floscularia ornata. Ehrenberg, Die Infus. 1838, p. 408, Taf. xlvi. fig. 2. 



Peltier, Ann. Sci. Nat. Zool. 2 Ser. t. x. 1838, p. 41, pi. iv. 

 Dujardin, Hist. Nat. Zooph. 1841, p. G10, pi. xix. fig. 7. 

 Gosse, Tenby, 1856, p. 307, pi. xx. 



Popular Sci. Rev. vol. i. 1862, p. 160, pi. ix. figs. 1-3. 

 Pritchard, Infusoria, 1861, p. 675, pi. xxxii. figs. 384, 385, and xl. figs. 25, 26. 



Weisse, Sieb. u. K<M. Zeits. Bd. xiv. 1864, p. 107, Taf. xiv. figs. 1-5. 

 ,, Bartsch, Die Raderth. b. Tubingen, 1870, p. 24. 



SP. CH. Lobes five, triangular, knobbed ; dorsal lobe without any process. 



The corona has five knobbed lobes of moderate length separated by broad depressions, 

 the dorsal lobe being distinctly the longest and broadest, and the knobs crowned with 

 long radiating setre. Ehrenberg describes F. ornata as having usually six lobes, but 

 sometimes five, and draws an example of each case. No doubt it must have been a 

 difficult matter for one of the old observers with only a monocular microscope, and that 

 a poor one, to make out the shape of a delicately transparent and scolloped cup, pre- 



