62 BRITISH FRESHWATER RHIZOPODA. 
variety differing only from the type iv its smaller size 
occurs, and may be distinguished as N. vitrea var. 
minor as suggested by Penard ; it is about 140 p to 
150 p in length: it has not vet been recorded from the 
British Isles and is rare in Switzerland, but at Lake- 
hurst in New Jersey it,is the dominant type. | 
ter 
1. Quadrulella symmetrica var. irregularis Penard. 
(Fig. 173.) 
Quadrulla symmetrica var. irregularis 
PENARD in Amer. Natur. XXV (1891), p. 1073; Faune Rhiz. Léman 
(1902), p. 378; Proc. R. Soc. Edinb. XXV, 8 (1905), pp. 595, 597. 
CasH Brit. Freshw. Rhiz. IT (1909), p. 182. 
Waites & PEenarD in Proce. R. Irish Acad. XXXI, txv (1911), 
p. 142, pl. vi, f. 31. : 
Waites in Jrn. Linn. Soc., Zool. XXXII (1912), p. 142, pl. xii, f. 20. 
J 
Fie, 173.—Quadrulella symmetrica vay, irregularis. x 250. 
Test larger than in the type, moderately com- 
pressed, the fundus, in broad side view, hemispherical 
with the sides tapering in nearly straight lines to the 
aperture; the aperture devoid of lips and without 
any constriction of the neck; plasma and pseudopodia 
as in the type. 
Length 130m to 160; breadth 55p to 604; 
aperture in greatest width 23 to 3830p. 
