556 



GENERAL HISTORY OF THE ESTFtTSORlA. 



from it. The lorica is combustible, and is something like a little die or 

 stamp, mounted upon a short stem. It is very irregularly formed, having 

 protuberances which make it appear four-cornered. The organ of locomo- 

 tion is a broad gelatinous variable process with smooth edges, not urdike 

 Amoeba verrucosa. Vacuoles have not yet been observed ; modes of propaga- 

 tion unknown. 



tion they might be seen to change their 

 places." Ehrenberg only once perceived 

 the locomotive organ of the animalcide, 

 situated under one corner, — upon which 

 it appeared to rest, and that so iirmly that 

 six out of the eight protuberances of the 

 die-like lorica were visible at the same 

 time. In fig. 26 the gelatinous variable 

 process is seen projecting from beneath 

 the lorica. Fig. 27 is a young specimen. 

 1-570" to 1-430". 



Cyphidium aureolum (xxii. 24-27). — 

 Lorica cubical, with protuberances ; pro- 

 cess colourless. "In March, 1835," says 

 Ehrenberg, "■ I first observed hundreds of 

 these creatm^es in a glass of water which 

 had stood throughout the winter, in com- 

 pany with some specimens of the Mi- 

 crasterias. Previously to discovering 

 these, the Amoiba verrucosa had been 

 abundantly generated, and afterwards 

 Arcella hyalina. The creatures were in- 

 active, although by attentive observa- 



Genus TEINEMA (Duj.). — Shell membranous but resistant, diaphanous, 

 ovoid elongated, narrower in front, with a large oblique orifice placed late- 

 rally ; expansions filiform, as long as the shell, very thin, and but two or 

 three in number ; entirely retracted when others are to be pushed out from 

 another side. The animal is moved onward by their alternate protrusion and 

 contraction. This genus is accepted by Eresenius. 



Trinema Acinus.— Difflugia Enchelys (Ehr.) (p. 553). 



Genus EUGLYPHA (Duj.). — Shell diaphanous, resistant, membranous, 

 elongated, ovoid, rounded at one end, terminated at the other by a very 

 large truncated orifice, with a dentated margin ; its surface marked by emi- 

 nences or depressions, in regular oblique series ; expansions filiform, nume- 

 rous, simple. 



EuGLYPHA tuberculata. — Lorica stri- E. alveolata (xxi. 11). — Lorica with 

 ated, with rounded tubercles. Termina- regular polygonal depressions in regular 

 tion of expansions extremely delicate, oblique (spiral) series, bearing spines at 

 1-295". Found in stagnant ponds. the upper or posterior end. 1-290". 



Genus GEOMIA (XXI. 12, 16) (Duj.). — Lorica smooth, yellowish -brown, 

 membranous, soft, globular, with a small round opening, from which the very 

 long branching expansions proceed, tapering to very fine extremities. Found 

 in both salt and fresh water. 



branching and anastomotic. 1-865" to 

 1-520". In rividets. 



" Notwithstandino- the absence of co- 



Gromia oviformis. — Globular, smooth, 

 aperture sorrounded by a short neck ; ex- 

 pansions very long, fibrous, branching, 

 slightly anastomotic, colourless or pale- 

 yellow, transparent; animal contents 

 of a yellow or reddish-brown colour; 

 the processes hyaline, permeated by a 

 current of granides. Shell 1-26" to 

 1-13". 



G. Jluviatilis. — Globular, or ovoid, 

 without a neck ; expansions palmate and 

 anastomotic. 1-290" to 1-104". 



G. hyalina (Schlumberger, A. S. N., 

 1845, p. 254). — Globular or rather ovoid, 

 smooth, soft, diaphanous, colourless ; 

 foramen round, with a very short neck, 

 formed by a reflexion of the lorica ; ex- 

 pansions filiform, numerous, very fine. 



lour in the shell," says Schlumberger, 

 "I arrange this species in the genus 

 Gromia. In size it also differs from the 

 other two species. The lorica, being 

 transparent, admits to view some bluish 

 globules, and a large hyaline glandular 

 ovoid body, like that in the interior of 

 other diaphanous Rhizopodes." 



G. D?yV/>Y///«V(Schidtze).— Shell sphe- 

 rical, ovoid ; more constant in figure than 

 G. oviformis, colourless or faint yellow, 

 with a short neck-like elongation at the 

 foramen, or none ; animal contents dark 

 sepia-brown ; processes hyaline, with no 

 moving granules. Diam. 1-2"'. Ancona. 



