Biology of the Antarctic Seas VII

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Published by way of the yank Geophysical Union as a part of the Antarctic learn Series.

This is the 7th quantity within the Antarctic learn sequence that bargains with marine biology. It includes 4 papers. 3 describe organisms from the bathypelagic area and from shallower depths, and the fourth offers with ciliated protozoans from shallow marine and freshwater habitats.

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The few mantle chromatophores are mostly of the large reddish brown type and appear to be arranged in transverse rows of 10-12 around the anterior half. They are slightly smaller and closer together on the ventral surface. Posteriorly, the rows break down, and the arrangement seems to be random. There are undoubtedly more chromatophores pres­ ent in life than are described here, but the total num­ ber is small, and the overall impression of the live animals is one of extreme transparency. Me'tnbranes and mantle chambers.

Dentition of the suckers consists of very few irregular incisions in the young animals and progresses gradually to more regular, blunt teeth. Regular, pointed teeth develop only in the distal sucker rings of larger individuals. Protective membranes and keels develop in small individuals (jess than 50-mm ML) but are very easily damaged and often lost. In addition, shrinkage in preservation often obscures the structures, so the complete progression of development could not be determined. The tentacles were strongly developed in the ear­ liest stages seen.

The paired oviducts (Figures 6f and 6g) lie in the wall of the most lateral extensions of the coelom, across the dorsal surfaces of the branchial hearts and accessory branchial hearts. As in other squids they are composed of three portions, the relative propor­ tions of which are quite different from descriptions in the literature [Williams, 1908 ; Young and Roper, 1967l . The terminology applied to these parts is modified from the work by Williams [19081 . The inner portion of the oviduct (the 'internal oviduct' of Williams [ 1908] ) is a thin-walled tube, tightly coiled in a flattened spoon-shaped proj ection above the inner dorsal side of the accessory branchial heart.

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