THE LINNEAN GENERA. * xiii 



SO. NERITA.— Plate 35. 

 Animal, a Limax. 



Shell, univalve, solid> somewhat globular, flat beneath ; aperture 

 semiorbicular : pillar-lip oblique relative to the axis of the shell, 

 flattish, truncate, and often toothed ; inner lip frequently 

 toothed or crenulated. 



31. HALIOTIS.— Plate 36. 

 Animal, a Limax. 



Shell, univalve, ear-shaped, generally flattish ; spire lateral, very 

 short ; aperture nearly as large as the shell ; disk perforated by 

 a row of pores in a line parallel to the edge. 



32. PATELLA.— Plate 87. 



Animal, a Limax. 



Shell, univalve, more or less conic, without a spire. 



33. DENTALIUM— Plate 38. 

 Animal, a Terebella. 



Shell, univalve, tubular, slightly arched, lessening insensibly towards 

 the extremity, and open at both ends. 



34. SERPULA.— Plate 38. 

 Animal, a Terebella. 



Shell, univalve, tubular, generally affixed to other bodies, open only 

 at the anterior extremity. 



