DESCRIPTION. 163 



Fig. 3. Patella fornicata. 



Shell oval, recurved towards the apex; lip 

 lateral, concave. 



Lister Conch. Tab. 545. Fig. 33. 



Specimen whitish, mottled and marked with 

 brown waved lines, darker towards the tip and 

 somewhat cinereous; lip white, prominent and 

 lunate ; margin acute. 



Inhabits the Mediterranean and West Indies. 



Fig. 4. P. equestris. 



Shell orbicular, wrinkled outwardly; lip verti- 

 cal, perpendicular. 



Lister Conch. Tab. 546. Fig. 38. 



Specimen white, hyaline, conical, obliquely 

 truncate at the base, covered with irregular folds, 

 wrinkles, and striae ; lip projecting, a little oblique, 

 open on one side, situated under the centre of the 

 vertex, formed like a canal. 



Inhabits the Indian and American Seas. 



Fig. 5. P. granatina. 



Shell angular, broader at one end, with nume- 

 rous muricate striae. 



