HARDWICKE'S SCIENCE-GOSSIP. 



8:; 



Nucleus, or Cont. vesicle visible. Fig. 6i, a form 

 with rather conical pseudopods, sarcode stretched 

 over a long Diatom. The Rhizopods of this germs. 

 possessing no definate or constant figure, species 

 mongers have taken foil advantage of their oppor- 

 txmities, and have given specific names to a number 

 of slightly different forms. There are, however, a 

 few, which exhibit permanent differences, which in 

 the present state of our knowledge, it may be as well 

 to distinguish in this way. 



Amxla villosa, which is locally tm common, differs 



63, larger form with three anterior lobes, Nncleos, 

 and two or three Cont. vesicles. 



Amaha radwsa is another small and inactiTe 

 spedes, very rare here. Indeed, so rare is it, that I 

 have never found it in any of the numerous places 

 where I habimally collect. My first and only 

 specimens were taken from a plate which had been 

 under a Fem-case. There were literally thousands 

 of them, among the floccose sediment, along with 

 other obscure Rhizopods (Vampyrella, dec.) and 

 Rotifera vulgaris and PhUodjna erytlwthaJma. They 



Fig. c:. — .-:. radijsa. 



Fig. 6-. — A. z-err:i::rs. 



Tig- ^5 — A. radidia. 







Fig. 6S. — A. Z'rrntcesa. 



Tig. 6^ — PeJjmryjca •riUoia 

 begrnning to pet forth its 

 pseudopodia. 



r^M2^^, 



Fig. 66. — A. tHZosa. 



>>^< 





M 







Fig. -^.—FcS- 



.: ;z Tulasa in motian. 



ffom the preceding in several particulars ; it has a 

 distinct anterior and posterior region ; the villous 

 part, which is knob-like, is always posterior, and is 

 covered with persistent, prickle-like pseudopodia ; 

 the anterior pan is broadish ; ectosarc, a well-defined 

 zone, and its general form is irregularly cl::vate, 

 occasionally with two or three broau, anterior lobes. 

 There is a single, generally large Cont- vesicle 

 posteriorly situated, and a little in front of this the 

 Xncleas. Size from ^ to -jlj, of an inch. Found 

 among mosses, Algs, and frequently in Sphagnum. 

 Fig. 62, small form with Cont. vesicle. Fig. 



have from two or three to a dozen tapering pseudo- 

 pods, and these may be short or two or three times 

 the diameter of the body. This form has little 

 colour, and I never found any with food-balls or 

 ccdouTed drops of any kind. There is generally a 

 distinct Nucleus, and one or several Cont. vesicles. 

 It is when freely floating that they exhibit their 

 characteristic radiate form ; when crawling this is 

 somewhat lost, as the pseudopcKiia are either retracted, 

 or a few only are put forth in the direction of motion. 

 WTien calmly floating the pseudopodia may be seai 

 shortening or lengthening, or slowly bending back- 



