156 



ERRATA. 



Page 17, for "worl" read "whorl." 

 „ 37, for " Solenida" read " Solenea." 

 „ 44, for " Lithophagi" read " Lithophaga." 



„ 79, 6th genus of Family Ostracea omitted. 



6. Genus Crania. PI. TX. 

 Ayiimal. See Anomia. 



Shell. Orbicular; the upper valve gibbous and conical; lower 

 valve flat, with three perforations. Inhabits the Indian Ocean. 

 One species. 



Crania orbicula. 



