Transactions of the Royal Society of New Zealand Volume 35 - Softcover
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...monograph. Generic description: Paludicella is one of the best marked of all the genera of fresh-water Polyzoa. The zooecia are club-shaped, each of which gives rise to two zooecia near their upper end, sharply separated from each other by complete septa. Lophophores perfectly orbicular. These, together with its internal anatomical details, remove it by a well-marked interval from the other genera. The present locality--Ross Creek Reservoir--is the most southerly of any of those hitherto recorded in the Old or the New World. On the first occasion on which I noticed specimens they had come through the ordinary town watersupply tap, about a mile and a half from the reservoir, and were floating in a white earthenware basin. They at once attracted attention in consequence of their very black colour. This apcears to be the normal winter condition, and the black membrane is said to act as a covering for the undeveloped buds, ready to be put forth when warmer weather comes round. This has been worked out in the elaborate monograph by MM. Dumortier and Van Beneden, ' On the Natural History of the Fresh-water Polyzoa."J Allman says, with regard to this condition, "These hybernaculae are gemmae which under the influence of a favourable temperature would have grown into the ordinary lateral branches of the Polyzoon, but which towards winter acquire a G. J. Allman, Monog. Fresh-water Polyzoa. London, 1856. Ray Soo. t Bull. Aoad. Brux., tom, vi., 2nd part. p. 278, fig. 1. See also the woodcut in the Cambridge Nat. Hist., p. 502, fig. 250.; Mem. de 1'Acad. Roy. des Sciences et Belles Lettres de Brux., 1848. conical form, and then become for a while arrested in their development. In this state, surrounded by a firm membrane of a blackish-grey colour, they contin...
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- PublisherRarebooksclub.com
- Publication date2012
- ISBN 10 1232251011
- ISBN 13 9781232251019
- BindingPaperback
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