BY" R. VOX LENDENFELD, PH.D. 491 



176. DICORYME ANNULATA. Nov. sp. 

 Plate XVII., Fig. 30. 



Hydrocaulus composed of slightly branched stems, which attain a 

 height of about 1cm., arising from a reticulated Hydrorhyza. The 

 Perisarc of the Hydrocaulus annulated throughout. Slight strictures 

 also visible on the Hydrorhyza. Terminal cup-shaped extentions a 

 little larger than in Dicoryne conferta. The generative Zooids are 

 similar to those of the European species. 



T found this Hydroid in Port Phillip. 



EXPLANATION OF PLATES (1.) 



Plate XII. 



Fig. 8.— Plumularia tripartita, longitudinal section through an alimentary 

 zooid, and an inferior Machopolyp drawn from sketches of 

 optic and real sections made with DD., Oc. I. 



Fig. 9. — Plumularia tripartita, skeleton of colony. AA., Oc. III. 



Fig. 10. — Plumularia tripartita, a growing terminal end of a branch, optic 

 longitudinal section. DD., Oc. II. 



Plate XIII. 

 Fig. 11- — Section along the Symmetry-plane of the skeleton of a branch 



of Plumularia rubra. C, Oc. I. 

 Fig. 12. — Horizontal projection of the same. 

 Fig. 13. — Section along the Symmetry-plane of the skeleton of a branch 



of Plumularia Torresia. C, Oc. 1. 

 Fig. 14. — Horizontal projection of the same. 



Plate XIV. 

 Hydromedcs.^ in natural size. 

 Fig. 15. — Plumularia rubra. 

 Fig, 16. — Plumularia Torresia. 

 Fig. 17. — Plumularia gracilis. 

 Fig. 18. — Pentandra Balei. 

 Fig. 19. — Pentandra parvula. 



(1.) The letters and numbers indicate Zeiss's lenses. 



