. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 47. X IJOO Fig. ^4. pu«Ula. The end of a fractured chaeta, from a large speciiuen from T'n- alaska. Chaetae of Arenicola cliaetae, may attain a width of 15 to 20/a. The himina may be entire at its margin, and crossed by numerous tine oblique lines, or it may be breaking up, from the edge inwards, along the course of the oblique striae, so that its margin becomes denticulate. On the opposite side of the chaeta and pressed closely to the shaft, are Siigeblatter, the spines of which are smaller tha
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 47. X IJOO Fig. ^4. pu«Ula. The end of a fractured chaeta, from a large speciiuen from T'n- alaska. Chaetae of Arenicola cliaetae, may attain a width of 15 to 20/a. The himina may be entire at its margin, and crossed by numerous tine oblique lines, or it may be breaking up, from the edge inwards, along the course of the oblique striae, so that its margin becomes denticulate. On the opposite side of the chaeta and pressed closely to the shaft, are Siigeblatter, the spines of which are smaller than in A. cristata. Figs. 13 A, B (the latter an optical section) are drawn from the chaetae of A. marina, but the figures would serve also for some specimens of A. afisimilis. The chaetae of the latter species are, however, usually rather less hairy and the spines are smaller (Fig. 14) than those of A. marina, but examples from different localities have been found to exhibit variation in this respect. Chaetae of A. 2^7(silla also present con- siderable differences in the degree of their " hairi- ness," some closely resem- ble those of A. marina, than which, however, they are usually rather less hairy. The fractured end of a large chaeta, from a massive example of A. ijusilla, is represented in Fig. 15, and shows the Sagebliitter; the figure would serve almost equally well for a chaeta of A. marina. The chaetae of A. ccandata and branchi- alis are identical in form and characters. Although they are as stout basally as chaetae of the same lengtli from the caudate species, they begin to taper nearer to the proximal end, and their distal portion is consequently more slender. The newly formed chaetae of ^, ^-pmiiihiaiis. xipofauoto- •' nniiifil r'napta. surface \new Fig. 16.—A, A. ecaudata. Distal half of a notopodial chaeta, seen in optical section. podial chaeta, surface \ Please note that these images are extracted from scanned page images that may have been di
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