Note 112 — 3. Genus—TETRACLITA. Pl. 10, 11.

The synonymy of this species is complicated. De Blainville gives no description under the article Conia, published in 1818, or in the vol. published in 1822; but I believe, from the figures of the opercular valves, that I have correctly identified this species with his C. radiata. Mr. Sowerby gives no description of C. Lyonsii, or any figure of the opercular valves, but his drawing of the shell is much better than de Blainville’s, and I believe it is the same species. Whether de Blainville’s or Sowerby’s plate appeared first I cannot ascertain. In the second edition of Lamarck, Conia radiata of Blainville is given as a synonym to Balanus radiatus of that work; but this is quite erroneous. I may add that if de Blainville’s name does not apply to the present species, it must to T. cœrulescens, and as the latter is the older name it will be permanent. In this case, T. radiata might be allowed to stand as my own name, considering that Mr. Sowerby’s figure is imperfect and is not accompanied by any description. At first I thought that the present species might be the Lepas mitra of Spengler, (‘Skrivter af Naturhist. Selskabet,’ 1790, Tab. 6, fig. 5), but the parietes are not described as porose; and the folds on the walls are too broad; on the other hand, his description of the opercular valves makes me think this may be the same species.