80 BRITISH FRESHWATER RHIZOPODA. 



Pelomyxa villosa LEIDY Fresh. Rhiz. N. Amer. (1879), 

 p. 73, t. v; HITCHCOCK Synops. Freshw. Rhiz. (1881), 

 p. 8; G-RUBER in Zeits. f. wiss. Zool. XLI (1885), p. 189, 

 t. xiii, ff. 1-4; CERTES Cap. Horn. Zool. VI (1889), Prot. 

 p. 20; BOURNE in Q. J. Micr. Sci. XXXII, n.s. (1891), 

 p. 362, etc.; CASH in Trans. Manch. Micr. Soc. 1891 

 (1892), p. 48; FREXZEL Mikr. Fauna Argent. I, Prot. 1 

 (1892), p. 21, t, iii, f. 18, and -4 (1897), p. 147, in Bibl. 

 Zool. IV; LORD in Trans. Manch. Micr. Soc. 1891 (1892), 

 p. 56; BLOCHMANN in Biol. Centralbl. XIV (1894), pp. 86, 

 115; ? SCOURFIELD in Proc. Zool. Soc. 1897, p. 787; 

 PENARD in Rev. Suisse Zool. VII, no. 1 (1899), p. 16, t. i, 

 ff. 7-19 ; WILSON in Amer. Nat. XXXIV (1900) p. 548, etc. ; 

 ISSEL in Atti Ace. Torino, XXXVI (1901), p. 68; G-. S. 

 WEST in Journ. Linn. Soc., Zool. XXVIII (1901), p. 310; 

 CASH in Journ. Linn. Soc., Zool. XXIX (1904), p. 218. 



Amoela laureolata PENARD Faune Rhiz. Leman .(1902), 

 p. 131, ff. 



In structure and general character closely resem- 

 bling the preceding species, differing from it mainly in 

 its somewhat smaller size, and in the possession of a 

 caudal bulb, which is bordered with villi. Leidy 

 describes the organism as nearly opaque, except when 

 young, appearing, by transmitted light, brown or 

 black, with a hyaline border, but by reflected light 

 yellowish white, varied with other colours dependent 

 on the contained food. The body is spheroid or oval, 

 in the resting condition slightly compressed ; but in 

 active movement it is generally more or less ovoid, 

 with the broad extremity in advance, movement being 

 effected by broad wave-like expansions of the anterior 

 ectoplasm. The villi covering the terminal bulb are 

 closely compacted, filiform, straight, simple or ramose, 

 with a tendencv in some individuals to become short 



/ 



and papillary. Frequently at the posterior extremity 

 a bundle of pseudopodal processes, digitate or conical, 

 composed of clear ectoplasm, will form either in the 

 vicinity of the villous bulb or at some short distance 

 from it, or they may be developed, singly or otherwise, 

 on various parts of the body-surface. They disappear 

 during the animal's activity. The contractile vesicles 



