. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 70 Arenicolidae single statolith throughout life. In A. ecaudata and brancJiialis (Fig. 41) there is at first only one statolith. Later many others are formed, but the original one remains conspicuous by reason of its larger size. The statocysts of A. assimilis attain a much larger size than those of any other species : indeed, they are the largest known in the Polychaeta. There is some difference in the size of these organs in similar specimens of the same species from different localities. Fig. 38
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 70 Arenicolidae single statolith throughout life. In A. ecaudata and brancJiialis (Fig. 41) there is at first only one statolith. Later many others are formed, but the original one remains conspicuous by reason of its larger size. The statocysts of A. assimilis attain a much larger size than those of any other species : indeed, they are the largest known in the Polychaeta. There is some difference in the size of these organs in similar specimens of the same species from different localities. Fig. 38 A, B, which represent the statocysts of similar specimens of A. assimilis var. affinis, from Otago and the Falkland Islands respectively, illustrate an extreme instance of local variation in the size of these organs. The eyes are of simple structure. Each is formed of a lens. 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 Ashworth, James Hartley, 1874-1936; Ashworth, James Hartley. London, Printed by Order of the Trustees of the British Museum
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