AMCEBA GUTTULA. 55 



t. xiii, ff. 17, 18; CzERNYin Arch. f. Mikr. Anat. V (1869), 

 p. 162; TATEM in M. Micr. Journ. I (1869), p. 352; 

 FROMENTEL Etudes Microz. (1874), p. 347, t. xxiv, ff. 2, 

 3, 5; GEZA in Herausg. Ungar. Nat.-Mus. Budapest, I 

 (1877), p. 165; BUTSCHLI in Bronn's Thier-Reichs, I, 1 

 (1880), t.ii, f. 3 : COOKE in J. Quek. Micr. Club, vii (1880), 

 pp. 105, 106; PARONA in Boll. Scient. I, an. 2 (1880), 

 p. 24, and I. c. an. 4 (1882), pp. 51, 56 ; SACCHI in Boll. 

 Scient. Ill, an. 10 (1888), p. 41 ; PENARD in Mem. Soc. 

 Phys. Geneve, XXXI, no. 2 (1890), p. 132, t. iii, f . 2 ; in 

 Rev. Suisse Zool. VII, 1 (1899), p. 100; and Faune Rhiz. 

 Lernan (1902), p. 38, ff.; LONGI in Atti Soc. Ligust. V 

 (1894), p. 14; SCHEWIAKOFF in Mem. Acad. Imper. 

 Petersb. (7) XLI, no. 8 (1893), p. 5; RHUMBLER in Arch, 

 f. Entwick. VII (1898), pp. 118, 126, 139. 



Amseba guttula MAGGI in Rend. R. 1st. Lomb. (2) IX (1876), 

 p. 541. 



Hyalodiscus guttula BLOCHMANN Mikr. Thierw. Siisswass. 

 (1886), p. 10, t. 1, f. 3, and ed. 2 (1895), p. 12, t. i, f . i ; 

 DELAGE & HEROUARD Zool. concr. I (1896), p. 99. 



Guttulidium guttula FRENZEL Mikr. Fauna Argent. I, Prot. 

 4 (1897), p. 146, in Bibl. Zool. IV. 



In general character resembling A. limicola, but 

 shorter and broader in proportion to the length ; 

 during active movement ovoid and narrowed pos- 

 teriorly, without any caudal protuberance, but in place 

 of this with a few minute, nipple-like dentations occa- 

 sioned by a contraction of the ectoplasm at that point. 

 Movement effected by wave-like expansions of the 

 ectoplasm, anterior or lateral. The granular endo- 

 plasm contains a variable number of crystalline and 

 other particles, and occasionally minute diatoms. The 

 anterior ectoplasm is faintly bluish or hyaline ; the 

 whole organism is transparent ; the nucleus and con- 

 tractile vesicle are normally situated, the former 

 rounded, but susceptible of modification. 



Dimensions : Length 30-35 / ; breadth 20-25 /u. 

 In ponds, amongst submerged vegetation, frequent. 



This species was removed by Blochmann to Hertwig 

 and Lessor's genus Hyalodiscus, but there is really no 



