Identifier: transactionsofro81roya (find matches)
Title: Transactions of the Royal Society of New Zealand
Year: 1881 (1880s)
Authors: Royal Society of New Zealand
Subjects: Science
Publisher: Wellington, N.Z. : The Society
Contributing Library: Brigham Young University Hawaii, Joseph F. Smith Library
Digitizing Sponsor: Consortium of Church Libraries and Archives

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the other speciesof the genus, but the animal and dentition at once indicate its relationship.No doubt it will be found in many other localities. The central lobe ofthe median tooth is considerably produced ; the central denticle of thefirst lateral is rather larger than the others. The inner surface of theoperculum has some small granules at its anterior end; these are notcalcareous. EXPLANATION OF PLATE I., FIGS. A to H.A 1. Potamopyrgus cumingiana, x 5 times. 2. „ „ embryonic shells x 25 times. B 1. Potamopyrgus corolla, x 5 times. 2. „ „ animal x 5 times. C 1. Potamopyrgus antipodum, three varieties x 5 times. 2. ,, ,, operculum x 8 times. D Potamopyrgus pupoides, x 10 times.E Potamopyrgus cumingiana, teeth x 470 times.F Potamopyrgus corolla, median tooth x 470 times.G Potamopyrgus antipodum, median and first lateral teeth x 470 times.H Potamopijrgus pupoides, median, first and second lateral teeth x 470, and opercu-lum from the inside x 20 times. TRANS.NZINSTITUTEJOLMPLL
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F.WffMl. Z 3 lewTrealand //yn/?OB//M, and aFew C^e7tu^ of fl/SSO/M. HuTTON.—On a new Genus of Rissoinre. 147 Akt. XVII.—On a new Genus of Rissoin^e. By Professor F. W. Hutton.(Read before the Philosophical Institute of Canterbury, 3rd November, 1881.) Plate I. There is a small mollusc, common in the rock pools in Lyttelton Harbour,that I cannot bring into any genus in Adams Genera of Recent Mollusca.The shell is like that of Barleeia, but the operculum is sub-spiral, like thatof Rissoina, but witiiout the marginal ridge. The animal differs fromRissoina in having the opercular lobe simple, and the foot emarginatebehmd, as in Barleeia, but from this genus it differs in having the tentacleslong and setaceous, and the rostrum emarginate. From all other genera itis distinguished by the process on the operculum. Dardania. Gen. nov. Animal. Foot large, rounded in front, and emarginate behind ; opercu-lar lobe small, simple. Rostrum emarginate at the extremity ; tentacleslong, and setaceo

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