LEPAS BARNACLE. 203 



LEPAS Tintinnabulum* 

 BELL-SHAPED BARNACLE. 



Specific character. Shell sessile, the valves 

 irregularly and strongly ribbed longitudinally, 

 and the interstices delicately striated trans- 

 versely ; the form is sometimes conical, some- 

 times cylindrical ; the colour is pinkish incli- 

 ning to purple ; the diameter, which is some- 

 times exceeded by the height, varies from half 

 an inch to two inches. 



This shell is found in the West Indies, and 

 coasts of Africa, and often on the bottom of 

 ships arriving from more southern attitudes; 

 but its claim to be considered as a native of 

 Britain is very doubtful. 



LEPAS Anatifera. 

 DUCK BARNACLE. 



Specific character. Shell compressed, some- 

 what triangular, composed of five valves ; the 

 two lower ones are large, triangular, and faintly 

 striated ; the two superior valves long and tape- 

 ring downwards to an obtuse point, the upper part 

 angular on each side, the top rounded ; these 

 valves are also slightly striated ; the dorsel valve 

 is long, slender, and rounded ; the cartilages that 

 connect the valves and the peduncle are usually 



* Plate X. figure 6. f Plate X. figure 7 



