. Earthworms and their allies . Fig. 4. The same species. Ventral view of segments xvi-xx (numbered in the figure) which form the clitellum, the posterior boundary of which is shown by a curved line on segment xx. The figure will be understood from the annexed description. minute pair of pores on segment xviii do not take up the position of the ventral setae; for these are present and to the inside of each pore. A groove, shaped something like a reversed 3 or the Greek letter X, connects the orifices of each side of the body, the middle part of the groove, where the two semicircular halves of

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• Image ID: MAAY2G
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• Dimensions: 2977 x 1679 px | 25.2 x 14.2 cm | 9.9 x 5.6 inches | 300dpi

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. Earthworms and their allies . Fig. 4. The same species. Ventral view of segments xvi-xx (numbered in the figure) which form the clitellum, the posterior boundary of which is shown by a curved line on segment xx. The figure will be understood from the annexed description. minute pair of pores on segment xviii do not take up the position of the ventral setae; for these are present and to the inside of each pore. A groove, shaped something like a reversed 3 or the Greek letter X, connects the orifices of each side of the body, the middle part of the groove, where the two semicircular halves of which it is composed meet, coinciding with the minute pores on segment xviii which are the orifices of the sperm ducts.