ROTATORIA 



167 



Figure 3. — KcralcUa quadrala (Miiller), dorsal aspect of lorica of A, B, f. divcrgcns (Voigt) Phashakuri, 

 K35; C, f. divcrgcns Ootacamund Lake NS; D, f. jrcnzcli (Eckstein), Sundar Khun, K26; E, f. quadraia 

 trans, ad divcrgcns, Tso Nyak, L71a; F, f. valgoides n, Tso Nyak, L71a; G, f. quadrata, Mitpal Tso, L76; H, 

 f. tcstudo (Khrenberg), Mitpal Tso, L 76. 



Spines but this may best be regarded as a transition to valgoides, though Wesenberg-Lund's 

 figures and our collection from Tso Nyak indicate that the latter form may probably appear 

 in a quadrata population without intermediate forms with unequal spines. The following 

 names are probably sufficient to describe the chief members of the cycle and to designate 

 the varieties present in single collections. 



KcratcUa quadrala (Miiller). 



Diagnosis : Six anterior spines, reticulate sculpture forming a median series of undivided 

 hexagons, maxinmiu breadth of lorica slightly greater than the posterior breadth, the latter 



