A i IANTHOCYSTIS MYEIOSPINA. 



57 



">. Acanthocystis myriospina Penard. 

 (Text-fig. 191.) 



Acunthocystis nujrin*i>!>L<i 



PENARD Jahrb. Nassau. Ver. Natiivk. XLIII, 1890, p. 23 ; Helio- 



'/A >aires, 1904, p. 230, tig. 

 Acanthonystis ? sp. 



| LEiDYRep. U.S. Geol. Snrv. XII, 1879, p. 268, pi. xliii, ff. 8, 11, 13. 

 ? Seterophrys pusilla 



ZACH ARIAS Zool. Anz. XXV, 1902, p. <iH5. 



FIG. 191. Acanthocystis myriospina. (After Penard.) 



Body small, spherical ; outer envelope composed of 

 one or two layers of minute scales from which originate 

 very numerous, delicate radial spines ; ectoplasm, clear 

 or of a blue or bluish-green tint, often containing 

 yellow or dark-coloured food particles; endoplasm 

 placed eccentrically; nucleus small, placed eccentrically; 

 contractile vesicles one or more near the periphery ; 

 pseudopodia numerous, long, attenuate, granuliferous. 



Diameter of body 12-20 /x, usually about 15 /x. 



Spines about the diameter of the body in length. 



