OF THE VORTICELLINA. 



597 



accurately to decide what the being I U. Di(jardiun= Vorticella hursata and 

 which :Mliller met with is, from the ac- I V. utriculata (Miill.).— Capsular or utri- 

 count he has left us. I cular in shape, bellied posteriorly, cili- 



U. //;n«e<V?rt.— Sessile, cylindrical, dia- ; ated on the anterior margin. Midler 

 phanous ; orifice truncated, with 2 or 4 distinguished this being under two fonns, 

 indistinct cilia (according to Miiller), or, ; one of which he described as having a 

 as we mav presume, with a circlet of : projecting papilla at the centre oi the 

 cilia around the margin of the wider ex- ! anterior surface, capable of elongating it- 

 tremity, and a collection of cilia at the : self. In sea-water. 

 naiTower base, by which the animal at- 

 taches itself. Parasitic on the tentacles 

 of Bidla and Planorhk. 



These species of Miiller appear to us 

 too indistinct to insist on as independent 

 forms. 



Genus CHiETOSPIRA (Lachmann) (XXXIX. 5, 6).— The surface gene- 

 rally covered with cilia, like the genus Stentor, from which it is distin- 

 guis^hed by having that part of the parenchyma of the body which bears 

 the ciliaiy spii^al and the anus (which in all the Stentorinoe lies on the dorsal 

 siuface of the body, close under the ciliaiy spiral, and not in a common pit 

 with the mouth) tow^n out into a thin process. This process is narrow 

 and bacillar ; the series of cilia commences at its free extremity, and only 

 forms a spiral when in action by the rolling-up of the lamina. The process 

 bears the anus. The animalcules inhabit a sheath or tube, of a mucilaginous 

 or even horny density. " It is possible that the free-swimming SticJiotricha 

 secunda of Perty, which he arranges with the Oxytrichinae, is allied to Chce- 

 tospira ; his figiu'e, however, is very inexact, and might perhaps represent a 

 Loxodes or Amj)hileptus FascioJa ; and, as he does not desciibe the position of 

 the anus, which he never figm^es, any more than the contractile vesicle and 

 the nucleus, I do not ventiu'e to place his Stichotricha with the Stentorinae. 

 K it should tui-n out that it belongs to that family, it must be placed beside 

 the analogous sheath-inhabiting Chcestosjnra, as a genus not inhabiting a 

 sheath." 



Ch^tospiea 3//7//m (xxix. 5,6).— Ch.«»^c/oo/«.— Enclosing tube mucous 

 Slender. Thefirst cilia of the series upon in consistence; animalcule shorter and 

 the process are somewhat, but not re- more compressed; the roUed-up ciliary 

 markably longer and stronofer than the ! process does not form a complete turn of 

 rest ; when roUed up, the ciliated bacillar I a spiral ; the first cilia are considerably 

 process forms more than one turn of a ', larger than the rest, the first one espe- 

 spiral. Sheath fla^sk-shaped and horny, j cially being nearly t^dce as long as most 

 Hitherto found only in the open cells of 

 torn leaves of Lemna triscidca, growing 

 in fresh water near Berlin. 



of the others. 



Genus CCEXOMOPPHA (Perty) (XXYIII. 27-30).— SmaU, hyaline, of a 

 beU-like or hemispherical figure, concave at its truncated base, which has an 

 irregularly notched margin, and a tail-like process depending from it at its 

 centre. Rim of the bell furnished with long cilia. Except in the absence of 

 the long tentacula, these beings, according to Perty's figures, have a general 

 resemblance to minute campanulate Medusce ; or, otherwise, they may be 

 likened to miniature parasols with fringed edges and a short handle. 



Perty has placed this genus in his family IJrceolarina, which is equivalent 

 to that called Stentorina by Lachmann. But, to oiu' mind, much doubt must 

 attach to this assigned position, for not only is there a very great departure 

 from the general form of every genus of YorticeUina, as Perty himself could 

 not fail to remark ; but, from his figiu-es, no characteristic, no internal organ- 

 ization appears to establish the organic affinities of these curious beings. 



