208 MULTIVALVES. 



LEPAS Tintinndbulum* 



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 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 Anatifem.^ 



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 tapering downwards to an obtuse point, the 

 upper part angular on each side, the top roun- 

 ded ; these valves are also slightly striated ; the 

 dorsal valve is long, slender and rounded ; the 

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



