. Text-book of zoology for schools and colleges. Zoology. CHAPTER Vin. SUB-CLASSES LUCERNARIDA AND GRAPTOLITID^. The last remaining group of the living Sydrozoa is that of the I/ucernarida (Lat. lucerna, a lamp), under which name are included a considerable number of forms, differing from one another to a great extent in exter- nal appearance. It will be sufficient here to describe one or two tjpical forms. One group of the Lucemarida is represented by Zaicernaria itself (Fig. 23), which occurs not uncommonly in temperate seas. In Lucernaria we have a cup-shaped body, of a more or less gelatin
. Text-book of zoology for schools and colleges. Zoology. CHAPTER Vin. SUB-CLASSES LUCERNARIDA AND GRAPTOLITID^. The last remaining group of the living Sydrozoa is that of the I/ucernarida (Lat. lucerna, a lamp), under which name are included a considerable number of forms, differing from one another to a great extent in exter- nal appearance. It will be sufficient here to describe one or two tjpical forms. One group of the Lucemarida is represented by Zaicernaria itself (Fig. 23), which occurs not uncommonly in temperate seas. In Lucernaria we have a cup-shaped body, of a more or less gelatinous consistence, usually found attached by its smaller extremity to sea-weeds, this end of the body being developed into a small sucker. like the Hydra, however, Iiucernaria is not fixed, but can detach itself at will, and can even swim freely by means of the alternate contraction and expansion of the cup-shaped body (or "umbrella," as it is termed). Round the margin of the cup are tufts of short tentacular processes, and in its centre is fixed a single polypite, furnished with a four- ». lobed mouth. The essential elements ce™,(wiaaw*irfa attached of reproduction are developed within to a piece of sea-weed (after .i / j r 7" • -i. li- j -j. Johnston). the body of Ijucernaria itself, and it does not give off any generative buds, as so commonly occurs in other Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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