ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 249 



have twelve to fifteen tentacles ; they were found in eight tentacled forms, 

 apparently Cunoctantha octanaria. 



Addendum to the Australian Hydromedusae.* — A fonrth addendum 

 is added by Dr. K. von Lendenfell to his monograph : t besides the two 

 species of Hydra already described by him, viz. H. viridis L. and H. oligactia 

 Pallas, a third and new one is formed, for a species which invariably has 

 sii equal tentacles. H. hexactineUa is perfectly cylindrical ; colourless, 

 except that the endoderm has a slightly yellow tinge. Two kinds of 

 cnidoblasts with difftrent cnido-cells are found on the tentacles. The 

 anthor doubts the ganglionic nature of the cells des<.Tibed by Jickeli as 

 snob, as he finds no nucleus in them. These cells are interposed between 

 the ectoderm and supporting lamella, and cause a pn^tuberance of the 

 former. These are deeply stained, and it is •' not quite impossible " that 

 they may be the nuclei of sensitive cells similar to the palpocils of Sarsia- 

 polyps. 



New Actinozoa.t — Dr. W. Koch has described some new forms among 

 the Actinozoa collected by Prof. Greelf on three islands of the GuK of Gninea. 

 One new Alcyonarian, three Gorgonias, one Antipathes, five sea-anemones, 

 and four Madrepores. The histology of Zoanthus and Palyihoa is also 

 discussed. 



Beef-€orals of the ' Challenger.' § — Owing to the great interest whicli 

 was found to attach to the corals collected in shallow water by the 

 ' Challenger,' it was arranged that Mr. J. J. Quelch should write a short 

 report on them ; owing to the necessary limitations the greater part of this 

 memoir deals with the description of genera and species ; there were 293 

 species belonging to 69 gent-ra ; 73 of the species are new and eight of the 

 genera. In addition to the descriptions, there is an important analysis of the 

 geographical distribution, and there are valuable hints as to the analysis 

 of the influence of local conditions fe. g. temperature, snnshine, composition 

 of water, depth of growth) on the chairacters of the species. 



Porifera. 



RLndia. , — Dr. G. J. Hinde, in a paper on the genus Hindia, opposes 

 some of the statements of Prof. P. M. Dxmcan, urges that the sponge occurs 

 under various mineral conditions, and especially throws doubt on the cha- 

 racters of the fossil alga Palaear.hbja perforans, which. Dr. Duncan has been 

 able to detect in a large number of various fossil forms. 



IsorapMnia texta and Scytalia pertasa.^f — Herr C. Lahalka reports 

 the discovery of the remains of these two marine sponges in the Turonian 

 strata to the south of the heights of Eohatctz, near Eaudnitz, in Bohemia, 

 which appear to be in an excellent state of preservation. The author agrees 

 with Zittel as to the generic position of the second form. 



Protozoa. 



Multiplication of Amcebae.** — Mrs. (or Miss) Lillie E. Holman records 

 that on the 4;th July, 1880, she was examining the forms of life contained 

 in a Holman life-slide, which had been tilled for several hours. It con- 



• Prcc. Linn. Soc. N.S.Wales, x. (1886) pp. 679-81 (1 pL). 

 t See this Joaxnal, 188.5, p. 2,52. 



X ' Neae Anthozoen,' &c., 8to, Marbur?, 1886, 36 pp., 5 pis. 



§ Report of the Voyage of H.Jl.S. ''Challenger,' Monograph, xJvi (4to, London, 

 1886), 203 pp. and 12 pis. |1 Ann. and Mag. Nat. Hiat., xix. (1887) pp. 67-79. 



^ SB. K. Akad. Wiss. Wien, xcii. (1>86) pp. 647-52 (2 pis.). 

 *• Proc. Acad. Nat. Sci. Philad.. 1886, pp. 346-8. 



1887. s 



