Note 26 — 1. Family BALANIDÆ, (or Sessile Cirripedes).

I regret that I have used this term “tubuli”; for the threads thus designated, I believe, are not the same with the tubuli of Dr. Carpenter, which are not left after dissolution in acid. I have seen tubuli, as called by me, in the shell from the leg of a crab, after having been placed in acid.