AiTIXOl'HIlYS SOL. 21 



Peritricha sol 



BORY DE ST. VINCENT Encjcl. moth., Zoophytes, 1824, p. 614. 

 Acti.nophrys sol 



EHRENBERG Abb. Akad. Berl. 1830. p. 42, pi. ii, f. 4. 



LEIDY Rep. U.S. Geol. Surv. XII, 1879, p. 235, pi. xl. 



PENARD Heliozoaires, 1904, p. 98, ff. 1 and 2. 

 A. (1 /ft'ormis 



EHRENBERG Abb. Akad. Berl. 1831 (1832), p. 102. 

 A. marina 



DUJARDIN Hist. Nat. Zoopli. Infus. 1841, p. 264, pi. i, . 18. 

 A. stella 



PERTY Z. Keimt. Kleinster Lebensformen, 1852, p. 160, pi. viii, f. 5. 

 A. oculnta 



STKIN Die Infusionsthiere auf Entw. miters. 1854, p. 157, pi. v, f. 25. 

 A. Eichhornii 



CLAPAREDE Arch. Anat. Phys. 1854, p. 398, pi. xv. f. 1-6. 



A. tuillti/K'X 



CLAPAREDE ET LACHMANN Etudes s. 1. Infusoires. Mem. Inst. 



Nation. Genevois, VI, 1859, p. 451, pi. xxii, f. 4. 

 A. fissipes 



LACHMANN Verb., nat. Ver. preuss. Rheinlande, XVI, 1859, Sitz 



Her. p. 61, 

 A. longipes 



LACHMANN T.c, p. 61. 

 A. tiiiiicata 



LACHMANN T.c. p. 93. 

 A. limbata 



LACHMANN T.c. p. 93. 

 A. i>nrinl<>,fa 



CARTER Ann. Mag. Nat. Hist. (3), XIII, 1864, p. 34, pi. ii, f. 20. 

 A. ///(/<< 



LEIDY Rep. U.S. Geol. Surv. XII, 1879, p. 241, pi. xlvi, f. 4. 

 A. alveoluta 



SCHEWIAKOFF Mem. Acad. St. Petersb. (7), XLI, No. 8, 1893, 



P. 8. pi. i. f. 4 

 / J[niiohi solitaria 



SCHEWIAKOFF T.c. p. 7, pi. i. f. 3. 



Body spherical with a fine membranous investment ; 

 ectoplasm containing numerous large vacuoles ; endo- 

 plasin granular, colourless, containing numerous small 

 vacuoles ; nucleus large, placed centrally in the body ; 

 contractile vesicle large, usually .single ; pseudopodia 

 radial, numerous, long, attenuate, each containing a 

 rigid axis arising from near the nucleus ; reproduction 

 usually by division with or without previous encyst- 

 ment or by syngamy of two individuals within a cyst ; 

 habit usually solitary but may be colonial especially 

 when young. 



Diameter of body when mature about 40 p to 50 /z ; 



