14 



BRITISH FRESHWATER RHIZOPODA. 



2. Arcella catinus Penard. 

 (Figs. 162 and 163.) 



Arcella vulgaris 



LEIDY (pars) Freshw. Rhiz. N. Amer. (1879), p. 171, pi. xxviii, 



ff. 6, 7. 

 Arcella catinus 



PENARD in Mem. Soc. Geneve, XXXI (1890), pp. 154-155, pi. v, f. 87. 

 LAGERHEIM in Geol. Foren. Stockholm Forh. XXIII (1901), p. 507. 

 BROWN in Ann. Scott. Nat. Hist. 1911, p. 228 ; in Naturalist, 1912, 



p. 180 ; in Scott. Natur. 1913, pp. 186, 206. 

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



pp. 14, 20. 



WAILES in Scott. Natur. 1912, p. 60. 

 PLAYFAIR in Proc. Linn. Soc. N. S. Wales, XLII, 4 (1918), p. 640, 



pi. xxxiv, f. 12. 

 Arcella artocrea 



PENARD Faune Rhiz. Leman (1902), pp. 404-406, 5 figs. ; Sarcodines 



in Cat. Invert. Suisse (1905), p. 80. (Non Arcella artocrea Leidy, 



1879.) 

 Arcella vulgaris var. compressa 



CASH Brit. Freshw. Rhiz. I. (1905), pp. 138-139, f . 28. 

 WAILES in Jrn. Linn. Soc., Zool. XXXII (1912), pp. 123, 131. 



FIG. 162. Arcella catinus. 1, upper view ; 2, oral view ; 3, side view 

 in outline, x 280. 4, Usual appearance of the surface of the test ; 

 5, part of the test near the aperture, with two pores. x 1000. 

 (After Penard.) 



This is the same as A. vulgaris var. compressa Cash 

 described in Vol. I ; it may we think be legitimately 

 considered an autonomous species. In the British 



