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. 



