208 MULTIVALVES. 



LEPAS Tintinnabulum* 



BELL-SHAPED BARNACLE. 



Specific Character. Shell sessile, the valves 

 irregularly and strongly ribbed longitudinally, 

 and the interstices delicately striated transversely ; 

 the form is sometimes conical, sometimes cylin- 

 drical ; the colour is pinkish inclining to purple ; 

 the diameter, which is sometimes 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 latitudes ; 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 stria- 

 ted ; the two superior valves long and tapering 

 downwards to an obtuse point, the upper part 

 angular on each side, the top rounded; these 

 valves are also slightly striated ; the dorsal 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. 



