550 



SYSTEMATIC HISTOKT OF THE IMFUSORIA. 



the extremities, of the same length as 

 the body, and mostly branched. 



Other varieties of these pecidiar beings 

 are referred to, but not specially described, 

 by Dujardin ; for one, however, he pro- 

 poses the name of Amceha injiata. 



A. quadrUineata (Carter). — 1-350". 

 Mr. Carter has given this name to a 

 supposed new species (A. N. H., 1856, 

 xviii. pp. 243, 248), of which he gives a 

 diagi'am, but no specific description. 



A. lateritia (Fresenius). — Bounded or 

 oval, or drawn out at one end and rounded 

 at the other. Processes thin, linely 

 pointed ; points very numerous • colour 

 of a brick-red, becoming brow^ner after 

 death. In water at Walldorf with >S)^i- 

 rotcenia. 1-20 to 1-10 millim. 



A. actinophora (Auerbach) (xxii. 12- 

 18). — When without processes, its form 

 is more or less globular ; and even when 

 pseudopodes are protruded, the figure is 

 usually not much altered, those pro- 

 cesses being thin and spicular with 

 pointed ends (fig. 13), though they do 

 not exceed in length more than 1^- the 

 diameter of the body. This species is 

 remarkable for the number of crystalline 

 particles found in its interior, and for 

 the processes never being entered by the 

 granules of the interior of the JDody. 

 Auerbach believes that the Actino- 

 phnjs viridis of Ehrenberg is probably 

 no other than a large specimen of this 

 Amoeba. It is closely allied to A. hilim- 

 hosa, but is smaller, its surface smooth, 

 its processes radiating and simple, not 

 forked, its envelope thinner : it contains 

 the peculiar crystals, and has no starch- 

 globules as seen in the latter. 1-110'" to 

 1-70"'. In water at Breslau. 



A. hilimhosa (Auerbach) (xxn. 7-11, 

 20-23). — Figure more or less globular 

 when processes absent or few ; pseudo- 

 podes vary, being either wdde and laminar 

 with a spinous or dentate terminal mar- 

 gin, or elongated and tubular. 1-50'" to 

 1-35"'. 



A. porrecta (Schultze) (xxi. 3). — Hy- 

 aline ; processes numerous from all sides 

 of the irregularly-shaped mass, from 

 eiglit to ten times longer than the latter, 

 divergent like so many fibres, with in- 

 tercommunicating branches. Fissure 

 very changeable and rapidly so ; remark- 

 ably locomotive. The tine granules seen 

 to circidate through the processes. In 

 fresh and salt water. 



A. (/lohidaris (Schultze) (xxi. 2). — 

 Granular, delicate, yellowish-brown, 

 central portion surrounded by a hyaline 

 cortical lamina, from which the short, 

 stumpy processes are very slowly pro- 

 truded and withdra\Mi. Most of the 

 processes are also remarkable from their 

 rounded truncate ends being terminated 

 by a retractile spine. Ancona. 



A, polypodia (Schultze). — Processes 

 numerous, long, slender, wdth rounded 

 or truncate extremities, and hyaline ; 

 movements tolerably active. Lagoon- 

 water, Venice. 



A. Schidtzii (xxi. 1). — A species indi- 

 cated but not named by Schultze ; to 

 distinguish it, w^e have applied to it 

 that eminent naturalist's name. Central 

 portion granular ; surrounding lamina 

 hyaline; no granules enter the interior. 

 Processes short, tubercular, with rounded 

 extremities. Possibly the same as A. 

 verrucosa (Ehr.), In long-kept water 

 from Ancona. 



Supplementarif Genera, or Subfamily of AMGEBIIS'A. 



Geniis COEYCIA (Diij.). — An Amoebiform being, covered by a very expan- 

 sible, elastic, flexible membrane or sac, which becomes folded in different 

 dii'cctions by the movements and contractions or expansions of the animalcule, 

 — the whole organism sometimes, after it has several times tiuTied on itself, 

 looking like a folded piece of linen. The membrane remains distinct after the 

 animalcule is torn by needles, and the sarcode particles evacuated. The latter 

 contract themselves into little balls, and, by the property of vacuolation, become 

 hoUowed by little cavities in larger or smaller numbers. The contents con- 

 sist, besides sarcode, of granules, vacuoles, and foreign pai-ticles ; the first- 

 named move in currents from one part to another. The expansions are not 

 pushed forward, nor do they glide along the surface of reptation like those of 

 ArceUina or of naked AmoehcB ; they proceed from various points of the general 

 mass or body, and seem to seiwe rather to change the centre of gravity than 

 to furnish a point d^appui. 8-100'" to 20-100'". 



The name is suggested by the membranous envelope, which preserves the 



