EUGLTPHINA. 3 



Test hyaline, globular or oviform, glabrous, com- 

 posed of imbricated scales or plates; aperture terminal, 

 linear or circular. 35. Sphenoderia. 



Test small, transparent, oviform, formed of plates 

 arranged in alternating transverse rows ; aperture 

 small, terminal, oval ; plasma containing a orescent- 

 shaped chromatophore. 36. Paulinella. 



Test brown or yellow, retort-shaped, glabrous, 

 formed of imbricated circular scales or small discs on 

 a chitinous membrane ; circular or trigonal in trans- 

 verse section ; aperture circular, oblique. 



37. Gyphoderia. 



Test brown, chitinous, retort-shaped, glabrous, 

 covered with amorphous plates or discs, with or with- 

 out horn-like prolongations on the fundus ; aperture 

 circular, oblique, furnished with a thin membranous 

 disc-shaped collar. 38. Gampasmcs. 



Test hyaline, ovoid, unsymmetrical, formed of 

 circular, imbricated, silicious scales ; aperture circular, 

 oblique, invaginated. 39. Trinema. 



Test hyaline, ovoid or subcircular, unsymmetrically 

 compressed, formed of non-imbricated oval plates ; 

 aperture sub-circular or oval, oblique. 40. Gorythion. 



Genus 32. EUGLYPHA Dujardin, 1841. 



Difflugia Ehebnberg (pars) Infusionsth. (1838), p. 131. 



(Non Leclbec, 1815.) 

 Euglypha Dujaedin Zooph., Infus. (1841), p. 251. 



Test hyaline, ovoid or elongated, circular or elliptical 

 in transverse section, formed of circular, oval, or scuti- 

 form silicious scales arranged in alternating longitu- 

 dinal rows regularly imbricated ; glabrous or furnished 

 with silicioiis spines or oils ; aperture terminal, cir- 

 cular or elliptic, bordered by serrated or denticulated 

 scales ; the plasma colourless, only partially filling the 

 test, the central portion generally occupied by a stra- 

 tum of dark granules; nucleus large, placed centrally 

 towards the fundus ; one or two pulsating vesicles 



