124 UNIVALVES. 



PATELLA Grceca. 



CANCELLATED LIMPET. 



Specific Character. Shell ovate, thick, opaque, 

 strongly reticulated,* some of the longitudinal 

 ridges much coarser than the rest, and frequently 

 tuberculated by the crossing of the transverse 

 striae ; apex lateral, not much elevated, truncated 

 and furnished with an oblong perforation : colour 

 pale, dull brown, or yellowish white ; inside 

 smooth, white, sometimes rayed with dull red or 

 brown ; margin crenated, sometimes indented ; 

 length about three quarters of an inch, breadth 

 scarcely half an inch, height a quarter. It is 

 rarely found on the British coasts of a superior 

 size ; some of the foreign specimens are an inch 

 long. This shell belongs to the modern genus 

 Fissurella. 



PATELLA Pdludda. 



BLUE RAYED LIMPET. 



Specific Character. Shell sub-conical, thin, 

 pellucid, smooth ; summit slightly recurved, 

 lateral ; of a dusky brown colour, rayed with 

 dotted lines of the brightest azure blue which 

 vary in number from three to seven, length nearly 

 an inch, breadth not quite three-quarters. 



* Reticulated, crossed like net work, from the Latin, 

 reticul m, a small net. 



