PLATE I. 



Zapiirentis incondita (page 7). 



Figure 1. Base of a specimen. 



" la. Half of a transverse section. 



" \h. Longitudinal section, showing the undulated diaphragms. 



Zaphrentis rugatula (page 8). 



Figure 3. Upper part, including cup. 



" da. Longitudinal section, showing the depth of the cup. 



Zaphrentis corticata (page 9). 



Figure 4. A specimen, perfect to the base. 



" 4'Z. Transverse section of the same. 



" 46. Base of a specimen. 



" 2. ^ 



" 2a. \ Supposed to be of this species. 

 « 2b.) 



Figure 5. 



Zaphrentis cingulosa (page 10), 



The onlj specimen collected. 



