132 BRITISH FBESHWATISE EHIZOPODA. 



dines du Loch Ness," mentions tbe variety irregularis 

 first found by him in 1891 in Sphagnum from the 

 Rocky Mountains, gathered at a height of 10,000 feet. 

 In the Loch Ness gathering (1905) examples were 

 found which might be referable to this variety. There 

 is a doubt, however, as to whether it was not an 

 abnormal form of typical Q. symmetrica derived from 

 the adjacent Sphagnum bogs. No figure was published. 

 i^. symmetrica var. irregularis is described in the 

 'American Naturalist,' December, 1891, p. 1073. 



2. ftuadrula irregularis Archer. 

 (Plate XXIX, figs. 4-9.) 



Qiiadrula irregularis Archer in Q. Jrn. Miur. Sci. (n s.) 

 XVII (1877), pp. 103, 113; and in Jrn. Dublin Micr. Club, 

 III, 2 (1877), pp. 128, 231 ; G-. S. West in Jrn. Linn. Soc, 

 Zool. XXVIII (1901), p. 824, t. xxix, ff. 19, 20 ; Penaed in 

 Arch. Protist. II (1903), p. 260, f. (p. 261) ; and in Rev. 

 Suisse Zool. XIII, 3 (1905), p. 599, t. xiii, f. 15; 

 AvEEiNTZEv in Trudui S.-Peterb. Obshch. XXXVI (1906), 

 2, p. 232; and in Zool. Anzeig. XXXI (1907), p. 244; 

 ScHOUTEDEN (pars) in Ann. Biol. Lacusfcre, I, 3 (1906), 

 pp. 352, 353; HooGENEAAD in Tvdschr. Nederl. Dierk. 

 Ver. (2) X, 4 (1908), p. 410. 



Quadrula moiiensis Cash in I'r. Manch. Micr. Soc. 1891 



' (1892), p. 50, t. ii, ff. 14-16. 



Quadrula glohulosa Penard in Arch. Sci. nat. (3) XXVI 

 (1891), p. 141, t.' ii, f. 4; in Rev. Suisse Zool. VII, 1 

 (1899), p. 51, t. V, f. 6; and Faune Rhiz. Leman (1902), 

 p. 380, ff. 1, 2 (p. 381) ; FoEEL Le Leman, III (1904), 

 p. 138. 



Quadrula discoides Penaed in Arch. Sci. nat. (3). XXIX 

 (1893), p. 178, t. ii, f. 20, 21; and Faune Rhiz.' Leman 

 (1902), p. 379, n. 1-0 ; Thiebaud in Zool. Anzeig. XXIX 

 (1906), p. 796. 



Quadrula subglohosa Lagerheim in Forh. Geol. Foren. Stock- 

 holm, XXIII (1901), p. 516, f. 6; and op. cit. XXIV 

 (1902), p. 346, ii. 3, 4 (p. 350). 

 Quadrula irregularis var. globnlosa Penaed in Arch. Protist. 

 II, 2 (1903), p. 263 ; and Sarc. grands Lacs (1905), p. 42, 

 2 iT. (p. 43) ; Le Rodx in Ann. Biol. Lacustre, II, 1 

 (1907), p. 6. 



