22 Dr. M, Couglitrey 07i New-Zealand Hydvoida. EXPLANATION OF PLATES I. & II. Fig. 1. Terehraiulina ? Davidsoni, R. Etheridge, jun-, natural size. Ter-tiary Coralline Limestone, Mount Gambier, S. Australia. a, view of ventral valve ; b, view of dorsal valve and foramen of ventral valve ; c, interior of dorsal valve. Fig. 2. Waldheimia Garibaldiana, Davidson, natural size. Tertiary Co-ralline Limestone, Mount Gambler, S. A. a, ventral valve ; b, dorsal valve and foramen of ventral valve. Mg. 3. TF. Taylori, R. Etheridge, jun., natural size. Tertiary Coralline Limestone of the Murray-River Clifis, S. A. a, ventral valve ; 5, dorsal valve, with the groove indicating the position of the septum, and the foramen of the ventral valve ; c, lateral view of both valves. Fig. 4. W. gambiercnsis, R. Etheridge, jun., natural size. Tertiary Co-ralline Limestone of Moimt Gambler, S. A. a, view of ventral valve ; b, dorsal valve and foramen of ventral valve ; c, lateral view of both valves ; d, view of sinuate front margin. (The figure 4 a is partially restored on the left-hand side, the shelly matter being there broken away.) Fig. 5. TerehrateUa cojnpta, G. B. Sowerby. Tertiary Coralline Lime-stone of Mount Gambler, S. A. a, view of ventral valve ; 6, view of dorsal valve and foramen of ventral valve, both en-larged one and a half times ; c, interior of ventral valve ; d, in-terior of dorsal valve, showing the dilated portion of the mesial septum : the two latter figures are of the natural size. Figs. S a,b, c are from drawings kindly made for me by the late Mr. C. R. Bone, of the Museum of Practical Geology, shortly before his death ; for the remainder I am indebted to the artistic skill of my friend Mr. B. N. Peach (of the Geological Survey of Scotland). III. — Critical Notes on the New-Zealand Hydroida, Suborder Thecaphora. By MiLLEN CoUGHTREY, M.B., CM. Edinb. Univ., Hon. Fellow Historic Soc. Lane. & dies., President of the Dunedin Naturalists Field-Club, N.Z., &c. &c. [Plate III.] To the last volume (no. vii.) of the ' Transactions of the New-Zealand Institute I contributed a paper on the New-Zealand Hydroida*, in which I gave the results of an ex-amination of the type specimens of Capt. F. W. Hutton's paper on the New-Zealand Sertularians f, and of several new specimens I obtained on the New-Zealand coasts. Contrary to my usual practice, and with many misgivings on my part, these notes were rather prematurely published ; and I regret now that I did not hold them back until I had more works of * Vol. vii. pp. 281-293, plate xx. t Trans. N.Z. Inst. vol. v. 1872.
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