. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 50 Arenicolidae number, (2) gradual reduction and eventual loss of. the teeth behind the rostrum, (3) increase of the angle between the rostrum and shaft, and (4) elongation of the rostral region, which is seen only in crotchets from very large specimens. The crotchets of other species of Arenicola exhibit corre- sponding changes. A. assimilis}—Crotchets from a post-larval example of the var. afinis, 7' 6 mm. long, are shown in Fig. 21. The left one is drawn with the rostrum almost in optical sec- t
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 50 Arenicolidae number, (2) gradual reduction and eventual loss of. the teeth behind the rostrum, (3) increase of the angle between the rostrum and shaft, and (4) elongation of the rostral region, which is seen only in crotchets from very large specimens. The crotchets of other species of Arenicola exhibit corre- sponding changes. A. assimilis}—Crotchets from a post-larval example of the var. afinis, 7' 6 mm. long, are shown in Fig. 21. The left one is drawn with the rostrum almost in optical sec- tion ; the right one, which is shown. Fig. 20.—.4. tnarina (250 mm. long). The ventral end of a neuropodial chaetal sac, showing tlie formation of 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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