282 ArORRHAID.E. 



Genus struthiolaria, Lamarck. 



Mantle with the outer edge simple. 



Operculum unguiculate, with the nucleus apical. 



Shell oblong-oval; spire acuminated, apex obtuse; 

 aperture with a short canal in front ; columella thickened, 

 polished, truncate anteriorly; outer lip thickened and 

 sinuous. 



Ex. S. vermis, Martyn, pi. 26, fig. 6. Operculum, 

 S. vermis, fig. 6, a. Shell, S. papulosa, Martyn, fig. 6, h. 



The species of this genus are not numerous, and are 

 inhabitants of the seas of New Zealand and Australia ; 

 the name is derived from the form of the aperture, which 

 is supposed to resemble an ostrich's foot. 



Species of Struthiolaria. 



canaliculata, Spengl. scutulata, Martyn. 



papulosa, Martyn. vermis, Martyn. 



Genus llALIA, Risso. 



Shell oblong-ovate, ventricose, thin, polished ; spire 

 produced, apex obtuse, papillary; columella curved, 

 truncate anteriorly; outer lip simple, thin, efluse, slightly 

 sinuated near the fore part. 



Syn. Pryamus, Sismonda. Priamus, Beck. 



Ex. H. Priamus, Meuschen, pi. 26, fig. 7. 



The type of this genus is the Bulla helicoides of 

 Brocchi, a fossil shell ; the only recent species is the one 

 mentioned above, the Halia Flemiugiana of Macgill- 



