1. Busk of course based his divisions on zoarial characters and these though somewhat improved by Dr. Ortmann [No. 1 pp. 3 4] are now quite inadequate..
2. Schizoretepora n. gen. for which at present the subfamily diagnosis also serves as the diagnosis is the type genus; it includes the sehizostomatous Reteporas of which8. (B.) tessellata(Hincks) [No. 2 p.358 pi. xix. figs. 9–12] is a convenient type.
3. Sehismopora Macgillivray [No. 4 p. 29] is the type genus andS. costatathe type species: it does not appear to have been formally diagnosed; but the list of six species with the figures of their opcrcula published in the ‘ Prodromus' leaves no doubt as to its nature. [Maegillivray No. i dec. xvii. pp. 168 figs. 1–6. See also Maegillivray No. 2 pt. v. pi. ii.].
4. Loricaria americana Lamouroux No. 2 p.7 pi. lxv. fig. 9.
5. Gemellaria prima Reuss No. 7 p.170 pi. vii. figs. 6 7.