70 THE FOEAMINIFERA 



Species of this genus are sometimes found in 

 fresh water, and sometimes are marine. 



Examples from Fresh Wateii. —Ci. flu viatilis, Du- 

 jardin, ' Hist. Nat. Zooph. Infusoires,' 1841, p. 255, 

 pi. i. fig. 17 ; pi. ii. fig. 182. This species measures 

 from '09 to '25 mm. in breadth. Found upon Cerato- 

 pJiylluin, an aquatic plant growing in stagnant water. 



G. lujaUna, P. Schlumberger, ' Ann. Sci. Nat.,' 

 ser. 3, vol. iii. 1845, p. 255. This species has a 

 breadth of -03 to "05 mm. 



Marine Examples. — G. or//br7«/-v, Dujardin, 'Ann. 

 Sci. Nat. Zool.,' ser. 2, vol. iv. 1835, p. 345, pi. ix. 

 figs. 1, 2. Measures 1 to 2 mm. in length. Found 

 among marine plants. (Plate 1, fig. C.) 



G. TJiijardinii, Schultze, ' Organismus Poly thai.' 

 1854, p. 55. 



Diaphorojwdon, Archer. 



Test large, ovate ; built up of foreign bodies 

 (diatoms and the like). Pseudopodia of two sorts ; 

 the one long, branching and arborescent, issuing from 

 the mouth ; the other fine and hairlike, not reticu- 

 lated, springing from between the shell particles 

 (perhaps not true pseudopodia). Nucleus single, 

 large. Contractile vacuole present. 



Example. — ]>. mobile, Archer, ' Quart. Journ. 

 Micr. Sci.,' N.S., vol. ix. 1869, p. 394, pi. xx. fig. 0, 

 and vol. x. 1870, p. 123. Habitat, fresh-water pools 

 in Ireland. (Plate 1, fig. D.) 



