ISS 



MI.S07.0IC AND CAINOZOIC DI NOFL AGELL ATE CYSTS 



Processes can arise from any point on a plate within the simulate complex, some- 

 times even forming secondary rows, further strengthening the reticulum. 



The capsule is large, almost filling the pericoel apart from the horns. It has a thin 

 slightly granular wall. 



Occurrence. Eocene, London Clay ; Sheppey. 



Remarks. W. reticulata has an outline closely approaching W. articulata which 

 can occasionally have processes that are united distally, but never in the form of a 

 reticulum reflecting each individual plate constituting the pericoel. W. reticulata 

 differs from W. coleothrypta in the distal structure of the processes and in having two 

 well developed antapical horns. 



Wetzeliella (Wetzeliella) tenuivirgula sp. nov. 

 PI. 19, figs. 2, 4 ; Text-fig. 49 



Derivation of name. Latin, tenuis, thinned ; virgula, small twig — referring to 

 the processes. 



Diagnosis. Periphragm outline pentagonal to ovoidal, with each angle produced 

 into a well developed tapering horn — one apical, two lateral and one or two antapical. 

 Right antapical horn always the longer. Periphragm flattened in cross section, 

 save medially where it encloses the ovoidal capsule. Hollow, slender or branched 

 processes arising from periphragm and arranged in simulate complexes or occurring 

 haphazardly within complexes. Processes terminating distally in elongate, solid 

 secae, sometimes united to secae of adjacent processes ; giving rise to interconnec- 

 tions between processes on opposite sides of plate or remaining unconnected. Tabu- 

 lation typical of genus, with three sulcal plates. Archaeopyle usually formed. 



Fig. 49. Wetzeliella {Wetzeliella) tenuivirgula sp. nov. Left, tabulation of ventral (lower) 

 surface of holotype ; right, tabulation of dorsal (upper) surface. Shading indicates archaeo- 

 pyle. 



