. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 40 Arenicolidae mens of A. ecaudata. I also found crotchets^ in the posterior notopodia of a post-larval A. ecaudata, 8 mm. in length. This. Fig. 5.—A. ecaudata. Outline of the posterior end of a post-larval specimen, 8 mm. long, to show the chaetae. specimen has recently been subjected to further clearing, and this has rendered it possible to get a better view of the dorsal crotchets, which are not as short as they are drawn in the figure cited. Fig. 5 is a more accurate representation of this spec
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 40 Arenicolidae mens of A. ecaudata. I also found crotchets^ in the posterior notopodia of a post-larval A. ecaudata, 8 mm. in length. This. Fig. 5.—A. ecaudata. Outline of the posterior end of a post-larval specimen, 8 mm. long, to show the chaetae. specimen has recently been subjected to further clearing, and this has rendered it possible to get a better view of the dorsal crotchets, which are not as short as they are drawn in the figure cited. Fig. 5 is a more accurate representation of this specimen and of its two types of crotchets, which are shown more highly magnified in Figs. 6, 28 (p. 56). Elongate crotchets, similar to that of Fig. 6, are present in the last five notopodia of post-larval examples of A. hranchialis, 4'4 and 5 • 8 mm. long respectively. I have examined a series of larval and post- larval A. cristata for notopodial crotchets, which are already present in larvae with four or live chaetiferous segments. A larva, • 7 mm. long, with ten chaetiferous segments (Fig. 7), bears in each of the last six notopodia a crotchet of the long Fig. ^. ecaudata. ^IV^- ^^ ^^ oMcr Specimen, 2 • 6 mm. long, which of tii^'^posterior noto^ ^^^^ ^^^^ ^"^^ number (seventeen) of chaetiferous rhowu"fn^F'J-''r""''" segments, only one notopodium, the penultimate, contains a crotchet; and in a specimen 3 mm. long crotchets are not present in any of the notopodia. It is clear from these ol>servations that a crotchet, differing from 1 Figured in Q. J. Micr. Sci., xliii (1900), pi. xxiv, fig. 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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