. The Australian zoologist. Zoology; Zoology; Zoology. 190 A MONOGRAPH OP THE AUSTRALIAN LORICATES, out. we may note the general features follows:—Viewed with a lens it presents a spiny surface, the spines arranged in rows of about l(i, two near the middle being much larger and more strongly hooked than the others. The total length of the radula may, in the larger Loricates of our coasts, measure 10 mm., with a breadth of L mm. It is used to tear away the algal food by a forward thrust, the small particles of food being conveyed to the stomach by retracting the Fig. 4.—Loricate An
. The Australian zoologist. Zoology; Zoology; Zoology. 190 A MONOGRAPH OP THE AUSTRALIAN LORICATES, out. we may note the general features follows:—Viewed with a lens it presents a spiny surface, the spines arranged in rows of about l(i, two near the middle being much larger and more strongly hooked than the others. The total length of the radula may, in the larger Loricates of our coasts, measure 10 mm., with a breadth of L mm. It is used to tear away the algal food by a forward thrust, the small particles of food being conveyed to the stomach by retracting the Fig. 4.—Loricate Animal, as dried in shell (when alive the foot is generally more expanded hiding the gills). H. Head. M. Mouth. F. Foot (ventral surface). G. Gills. Ecology. This term is here applied to the position or station on the littoral or sea floor frequented by the,various genera, and their interrelation with sur- rounding conditions. Generally speaking, the Loricates are of littoral habit, the range extending from mean high water mark to a lew feet below low water mark. A small percentage of recorded species is found at greater depths below low walei-. those from the greatest depths being more or less degenerate forms. The station of the various genera differs, some being restricted to the upper side of the rocks; a much larger proportion being found on the under side of stones lie- low median tide mark; while others are found attached to the leaves or stalks of sea grasses. Those genera which are emerging and gradually becoming estab- lished in stations where they are exposed to the sun and air for the greater part nf each day are generally eroded or covered with marine growths which obliterate their sculpture. These forms appear to be sedentary. The occupants of the next lower zone are more nomadic, moving freely and changing their station in ac- cordance with the seasons and the varying surface temperatures of the water. Tt may be noted that these factors are not always synchrono
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1914
