TAB. XVI. 



Fig. 



1. Natica Guillemini, jyr/^p 142. 



a. Ijack view. 

 h. front view. 



2. Natica clausa, /;. 147. 



a. back view. 

 h. front A'iew. 



3. Natica helicoides, p. 145. 



a. back view. 

 h. front view. 



4. Natica proxima, p. 143. 



a. back view. 

 h. front view. 



.5. Natica liemiclausa, p. 144. 

 «. back view. 

 h. front view. 



6. Natica varians, 7;. 143. 

 a. front view. 

 ^A back view. 



7. Natica cirriformis, /». 145. 



a. back view, 

 i. front view. 



8. Natica catena, p. 142. 



a. back view. 

 h. front view. 



9. Natica multipunctata, j?;. 148. 



ft. back view of spotted specimen. 

 h. front view, same specimen. 



c. specimen with operculum in situ. 



d. front view of var. /3, from Cor. 



Crag. 

 I", back view of same specimen. 

 /. operculum, from Cor. Craa;. 



10. Natica catenoides, p. 141. 

 a. back view. 

 h. front view. 



