12 Mr. R. Kirkpatrick on Fiy. 3. Detached spicules of the envelope eiiclosiDg the gemmules. En-larged 100 diameters. Fig. 4. One of the monticules of gemmules, showing the irregularly-arranged cylindrical spicules of the outer layer ; these are par-tially weathered off at one end, and the surface of one of the gemmules is exposed. Enlarged 20 diameters. Fif). 5. A portion of the exterior surface of a gemniule, showing the natu-ral arrangement of the amphidisc-spicules. Enlarged 200 dia-meters. Fi(j. C. Detached amphidisc-spicules. Enlarged 6G0 diameters. Uruguay a pygniaa, n. sp. Fig. 7. A complete specimen, in which two oscules are developed. It is growing at the base of TJ. Macandreivi. Enlarged 8 diametei's. Fig. 8. A portion of the exterior surface, showing the arrangement of the spicules. Enlarged GO diameters. Fig. 9. Detached skeleton-spicules. Enlarged 100 diameters. Fig. 10. Detached amphidisc-spicules. Enlarged 660 diameters. Uruguaya Macandrewi, n. sp. Fig. 11. A fragment of the type specimen, showing its mode of growth and the character of the oscules. Natural size. Fig, 12. Cylindrical and immature acerate spicules of the skeleton. En-larged 100 diameters. Fig. 13. Detached spicules of the monticular envelope. Enlarged 100 diameters. Fig. 1-1. Detached amphidisc-spicules. Enlarged 660 diameters. Uruguaya corallioides, Bowbk., sp. Fig. 16. A fragment of the type specimen, showing the mode of growth and the arrangement of the oscules. Natural size. Fig. 16. Detached skeleton-spicules. Enlarged 100 diameters. [The originals of all the figures are in the British (Natural liistory) Museum.] II. — Poly zoa from Port Phillip. By R. KlRKPATrviCK, British Museum (Natural History). [Plate II.] A COLLECTION of Polyzoa dredged in the neighbourhood of Port Phillip by Mr. J. Bracebridge Wilson was sent by him to the Natural-History Museum. Tlie collection contains representatives of ninety-five species, of which six appear to have been undescribed, and fifteen have not been recorded from the locality. The genera Amatliia and Catenicella were most largely represented.
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