EXPLANATION OF THE PLATE. 
(ok GSI ee ea SS ee 
Deima Blakei, Théel, from above. 
The same, from below. 
Echinocucumis typica, Sars. 
Prolus operculatus, Pourt. 
Prolus tuberculosus, Théel. 
Prolus Pourtalesii, Théel. 
Prolus brasiliensis, Théel. 
Trochostoma Blakei, Théel. 
