PLATE XXX. 



FIG. I. 

 LEPAS BALANUS. 



RIDGED ACORN SHELL. 

 GENERIC CHARACTER. 



Animal Triton. Shell of many unequal valves ; affixed by a stem. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell conic, deeply furrowed, or wrought with prominent longi- 

 tudinal ridges. Operculum fharp pointed. 



Lepas Balanus : testa conica sulcata fixa, operculis acumunatis. 



Linn. Syst. Nat. p. 1 107. 

 Balanus majusculus valvis porcatis. Porcatus. Da Cost a , Br. 



Conch, p. 249. sp. 69. 



Frequent on the British coasts, adhering to rocks, shells, Sec- 

 It is a large and ftrong species, being seldom less than the size of a 

 filbert, of a conic form and rugged appearance, and is wrought with 

 very prominent longitudinal ridges. 



VOL. I. K 



