PLATE 18 



Wetzeliella (Wetzeliella) articulata Eisenack 

 Fig. i. Specimen dorsal side uppermost showing archaeopyle, dorsal view. ¥.51955(2). 

 X33o. 

 Fig. 2. Specimen, ventral side uppermost. ¥.51961(1). X330. 



Fig. 3. Isolated periphragm operculum from archaeopyle of outer shell. Processes, except 

 for central use, arranged in simulate complexes. ¥.51763(2). x 700. 



Fig. 4. Isolated endophragm operculum from archaeopyle of inner body. ¥.51763(2). 

 X700. 



Wetzeliella (Wetzeliella) articulata var. conopia nov. 

 Fig. 5. Specimen, dorsal side uppermost, with periphragm archaeopyle. Slightly displaced. 

 ¥.51962. X330. 



Wetzeliella (Wetzeliella) clathrata Eisenack 

 Fig. 6. Narrow strips of minutely perforate membrane connect the distal ends of the pro- 

 cesses. ¥.51958(2). X330. 



Wetzeliella (Wetzeliella) homomorpha var. quinquelata nov. 

 Fig. 7. Specimen showing restriction of processes on the dorsal side to the simulate com- 

 plexes. Periphragm operculum slightly displaced. ¥.51963(1). X330. 

 Wetzeliella (Wetzeliella) coleothrypta sp. nov. 

 Fig. 8. Holotype. ¥entral view. ¥.51753(3). X330. 

 Fig. 9. Specimen with more numerous spines. ¥.51964(1). X330. 



Wetzeliella (Wetzeliella) ovalis Eisenack 

 Fig. 10. Dorsal view of specimen with operculum slightly displaced. ¥.51965(1). X330. 



