JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



213 



Balanits niibilus Darwin. Fig. 2 



This is one of the small acorn barnacles, also very numerous on 

 the rocks at tide level. Here the plates, usually six in number, 

 although in some the lateral plates are divided, are closely joined 

 to each other without connecting pieces. 



Figure 3 Figure 4 



Mitella polymerus Sowerby. Fig. 3 



This is a very abundant species, and is found in great masses on 

 the rocks near the tide level. It is readily known by the numerous 

 irregularly arranged scales at the base of the capitulum. The 

 valves are usually much worn, and many cases of regeneration have 

 been noted. The peduncle is covered with fine scales. 



