PLATE I. 



Ziphius Layardi. 



Fig. 



1. Side view of skull. 



2. Upper view of ditto. 



3. Under view of rostrum, with section of ditto at *, in outline. 



4. Side view of mandible (parts broken restored in outline). 



These jSgures are l-6th nat. size. 



5. Summit of developed mandibular tooth, showing enamelled crown or portion, 



nat. size. 



6. Transverse section of mandibular tooth, nat. size. 



A recent species, from the Cape of Good Hope. 

 [The letters and figures are explained in the text.] 



