ABSTRACT
Under the last species I have shown that the porose parietes, but solid basis, distinguish this species easily from all the others, with the exception of B. porcatus, from which it can readily be known by the characters of its opercular valves, as already thereunder stated. Judging by external appearances alone, which ought never to be trusted to in. the identification of any sessile cirripede, this species might easily be confounded with Bal. dolosus, found fossil in the same deposits.
