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[Quahog:]
Photograph taken from a model in the Museum of Natural History in New York. The different portions of the anatomy are indicated by the labels. The sympol A. A. and P. A. refer to the anterior and posterior adductor muscles, which hold the two valves of the shell together. The posterior part of the animal is represented by the siphon, which consists of two parts, an incurrent and an excurrent, through which the water enters and leaves the quahaug in the directions indicated by the arrows. In the mantle chamber the food is filtered from the water by the gills, which are here shown cut off near their base.

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