Proceedings of the Royal Society of Victoria, Vol. 22

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Excerpt from Proceedings of the Royal Society of Victoria, Vol. 22: Part I, (Containing Papers Read Before the Society During the Months of March to July, 1909)Description.-carapace elongate, sub-oval. Right valve larger, and with the ventral Overlap well - marked. Seen from the side, dorsal line straight, ventral margin evenly curved, narrowly rounded in front and incurving at a sharp angle to the antero dorsal angle, widely rounded behind and meeting the dorsal border with little or no angularity, differing in this respect from the allied L. Marginata, Keyserling sp.1 Central tubercle situated in the middle Of a large, well-defined pro minence, and somewhat anterior in position. In front of this tumid area the surface of the valve is strongly compressed, and this is extended, as a narrow marginal ¿ange, more or less all round the carapace. C'asts of this ostracod show the marginal compression more uniformly. This latter feature was noticed by Keyserling, especially in his (2) adult or large example, and was ascribed to the presence Of an inverted ventral plate. Some of the casts in the present series also support the idea Of an internal ¿ange. Behind the central tubercle the surface Of the valve slopes, at first rather rapidly, and then gradually, to with in the area Of the posterior third. The lucid or muscle spot is best seen on the interior of the valves, appearing as a circular depression marked by a network Of fine polygonal grooves with a general adial arrangement. Anterior tubercle (eye-spot) small, round and always conspicuous situated closer to the antero - dorsal angle than in L. Balthica, His. Sp., and more exactly in the position shown by L. Marginata. The structure Of the valves is clearly brought out in weathered examples, and the coarse pittings and radial grooving in proximity to the central tubercle is then well seen.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.