92 BRITISH FRESHWATER RHIZOPODA. 



Arcella hyaHna 



EHRENBERG in Abh. Akad. Ber'.in, 1841 (1843), pp. 300-368 passim, 



444, pi. i, II, f. 31 ; iii, vi, f. 6; iv, I, f. 34 ; iv, v, f. 3 ; op. cit. 1871 



(1872), p. 234; in Zweite Nordpolarf. II (1874), p. 460, pi. iii, f. 32. 

 Arcella enchelys (liyaUna) 



EHRENBERG in Abh. Akad. Berlin, 1847 (1849), table opp. p. 460; 



in Ber. Akad. Berlin, 1853, p. 255 ; Mikrogeol. (1854), pi. v, i, f. 39. 

 Arcella enchelys 



EHRENBERG Mikrogeol. (1854), p. xiv, f . 96 a ; p. 159, pi. xxxiii, iv, 



f . 1 ; pi. xxxiv, XII A, f . 7 ; p. 359, pi. xxi A, f . 5 ; xxi B, f . 5 ; in 



Monatsb. Akad. Berlin, 1856, p. 333. 

 Arcella enchelys a 



EHRENBERG Mikrogeol. (1854), p. 277, pi. xxxiv, v u, f . 3 ; pp. 260, 



262, pi. xxxv, A, ii, f. 2. 

 Trinema acinus 

 LEIDY (pars) Fresbw. Rhiz. N. Amer. (1879), pp. 226-228, pi. xxxix, 



ff. 34, 38, 43, 55-59. 

 Trinema lineare 

 PENARD in Mem. Soc. Geneve, XXXI, i, 11 (1890), p. 187, pi. xi, ff. 



5-17; in Jahrb. nassau. Yer. Naturk. XLIII (1890), p. 72; in 



Amer. Natur. XX Y (1891), pp. 1071. 1075 ; in Rev. Suisse Zool. 



IX (1901), p. 238 ; Faune Rhiz. Leman (1902), pp. 529-530, 2 figs. ; 



in Arch. Protist. II (1903), p. 272 ; Sarcodines in Cat. Invert. 



Suisse (1905), p. 110 ; in Proc. Roy. Soc. Edinb. XXY (1905), 



p. 595; in Arch. Protist. IX (1909), p. 265; in Brit. Antarct. 



Exped. I (1911), pp. 221, 254; in Deux, exped. antarct. fran9. 



(1911), pp. 4, 13. 



FOREL Le Lcman, III (1904), 1, p. 137. 

 MURRAY in Proc, Roy. Soc. Edinb. XXY (1905), p. 615; in Bathym. 



Surv. Scott. Lochs, I (1913), p. 326. 

 THIEBAUD in Ann. Biol. lacustre, I (1906), p. 796 ; op. cit. Ill (1908), 



pp. 66, 121. 



EVANS in Proc. R. Phys. Soc. Edinb. XYII (1907), table 1. 

 HEINIS in Zool. Anzeig. XXXIII (1908), p. 714 ; in Arch. Hydro- 



biol. Y (1910), p. 110 ; in Rev. Suisse Zool. XIX (1911), p. 256. 

 HOOGENRAAD in Tijds. Nederl. Dierk. Yer. (2) X (1908), p. 714. 

 COCKERELL in Univ. Colorado Stud. YI (1909), p. 30. 

 BROWN in Naturalist (1910), p. 93 ; op. cit. 1912, p. 181 ; in Jrn. Linn. 



Soc., Zool. (1910), pp. 362, 366 ; in Brit. Assoc. Handb. Sheffield 



(1910), pp. 500, 501 ; in Ann. Scott. Nat. Hist. 1911, pp. 229, 230; 



in Scott. Natur. 1913, pp. 186, 208, 210. 

 HOPKINSON in Irish Natur. 1910, p 3. 

 WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV (1911), pp. 19, 



60, 61. 

 WAILES in Scott. Natur. 1912, p. 61 ; in Jrn. Linn. Soc., Zool. XXXII 



(1912), pp. 126, 152; loc. cit. (1913), p. 213; in Murray's Nat. Hist. 



Bolivia and Peru (1913), pp. 32, 40 ; in Naturalist, 1913, p. 148. 

 EDMONDSON in Univ. Colorado Stud. IX (1912), p. 69. 

 CTJNHA in Mem. Inst. Oswaldo Cruz, IX (1913), p. 108. 

 Trinema enchelys forma j8 

 AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXYI, n (1906), p. 312. 



Test small, hyaline, elongate, smooth ; composed of 

 small circular plates ; transverse section circular or 



