. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . d without. The ventral margin of the valves issinuous and gapes slightly at a central point for the accommodation ofthe byssus. (Plate LXXVIII.) FAMILY MYTILIDJEGENERA Mytilns, Modiola The Mytilidm are a large family, including the mussels, so com-monly found between tides upon all shores. The two ordinarygenera Mytilus and Modiola, which often occur associated to-gether upon our eastern coast, may readily be distinguished onefrom the other by the position of their beaks. In t
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . d without. The ventral margin of the valves issinuous and gapes slightly at a central point for the accommodation ofthe byssus. (Plate LXXVIII.) FAMILY MYTILIDJEGENERA Mytilns, Modiola The Mytilidm are a large family, including the mussels, so com-monly found between tides upon all shores. The two ordinarygenera Mytilus and Modiola, which often occur associated to-gether upon our eastern coast, may readily be distinguished onefrom the other by the position of their beaks. In the formergenus the beak is terminal, that is, it is situated at the very tip-end of the shell; in the latter genus it is not quite from this simple feature, the genera are practically thesame, the animals being identical. Mytilus and Modiola, com-monly known as mussels, have acquired the stationary habit andare provided with a relatively small foot (in some species amount-ing to 110 more than a mere tubercle); but in place of a usefulfoot is a well-developed byssogenous gland, which secretes an ex-.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
