116 Rev. T. Hincks's Contributions towards a Fig. 9. An A. actinophora with a distinct cortical layer (rs), and a tuft of pseudopodia at one end (Hartuack, oc. 3, obj. 7). Fig. 10. Another with few pseudopodia, distinctly showing-how they break through the cortex. (Rather too large in proportion to the following figures.) Fig. 11. The same example a short time afterwards. The cortex (?• s) is almost everywhere liquehed, and has become converted into a clear space ( h) : n, the nucleus, which is distinctly visible in this state. Fig. 12. The same, with the cortex completely dissolved, v c, contractile vacuoles. Fig. 13. The same, in slow flow in the direction indicated by the arrow, r s, the newly reconstituted cortex. Fig. 14. Another example, in which the cortex has just become liquefied, but is still retained at one spot, together with two pseudopodia. Fig. 15. An Atnaba in which the cortex has dissolved before two pseudo-podia (;;s) were retracted. These become liquefied soon after-wards. In this and Fig. IG the granular protoplasm is sharply separated from the hyaline zone. This, however, only lasts for a few moments, to give place to the state in fig. 12. Fig. 17. An Ainoeha in which the liquefaction of the cortex had just commenced on one side, treated with osmic acid. The cortex (r s) appears finely punctate, as also the hyaline sarcode ; the nucleus at n. XV. — Contributions towards a General History of the Marine Polyzoa. By the Rev. Thomas Hincks, ]3.A., F.R.S. [Continued from vol. viii. p. 136.] [Plate v.] IX. FOREIGN CHEILOSTOMATA (Miscellaneous). Family Flustridae. Flustra, Linna3us. Flustra dentigera, n. sp. (PI. V. figs. 7, 7 a.) Zoarium of a ratlier dark-brown colour and a somewliat waxy appearance, with a narrow smooth edging, dividing dichotomously into tall, linear, strap-like segments, expand-ing very slightly upwards, which are not divergent, but con-tinue in close proximity throughout their length. Zooecia alternate, elongate, arched above and somewhat expanded, usually narrowing slightly below the middle, a line of uume-
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