438 Mr. P. H. Carpenter on certain Points in These lists collectively furnish the final column (Q) of the Distribution Table. POLYZOA. A few of the soundings contained specimens of Polyzoa in more or less fragmentary condition. These have been iden-tified by my good friend the Rev. A. M. Norman as. follows : — No. 500. Menipea arctica^ Busk. Crisia eburneo-denticulata^ Busk. In this sounding, and also in No, 51(5, there are examples of a very interesting simple form, the type of an undescribed genus. No. 514 a. Idmonea atlantica^ Forbes. Crisia ehurneo-denticulata^ Busk. No. 515. Crisia eburneo-denticulataj Busk. No. 525. Lepralia Jeffreysii^ Norman. Idmonea atlantica, Forbes. Hornera lichenoides^ Linn^. EXPLANATION OF PLATE XXI. Fig. 1. Haplophragrnmm nanum, Brady, magnified 120 diam. : a, supe-rior lateral aspect ; b, inferior lateral aspect ; c, periphero-lateral aspect. Fig. 2. Reophax ai'ctica, Brady, magnified 120 diam. : a, lateral aspect ; 5, end view, with aperture. Figs. 3, 4. Hippocrepina indivisa, Parker, magnified 60 diam. : a, lateral aspect ; i, end view, with aperture. 4. Section, showing the interior. Fig. 5. iVb?iio?imao?-&2C2<?«m, Brady, magnified 65 diam, : a, lateral aspect ; b, periphero-lateral aspect. Fig. 6. Discorhina Wrightii,'Bva.dj, magnified 85 diam. : a, superior lateral aspect ; b, inferior lateral aspect ; c, periphero-lateral aspect. XLI. — On certain Points in the Morphology of the Blastoidea. By P. Herbert Carpenter, M.A., Assistant Master at Eton College. Since the appearance of the classical memoir by Eomer scarcely any attention has been paid upon this side of the Atlantic to the morphology of the Blastoidea. In America, however, the case has been very different. White, Shumard, Billings, Lyon, Hall, Meek and Worthen, and various other
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