. Earthworms and their allies. Earthworms. 6 EARTHWORMS AND THEIR ALLIES [ch. on each of the segments xvii, xviii, xix are a pair of pores of which those on the xviiith segment are the least conspicuous. The large pair of pores on each of segments xvii and xix occupy the position of the ventralmost pair of setae, which are here absent, or rather replaced by a very long curved and ornamented seta, which projects out of the orifice. These two pairs of pores are the outlets of the prostatic glands as they have been termed. The. Fig. 4. The same species. Ventral view of segments xvi-xx (numbered i
. Earthworms and their allies. Earthworms. 6 EARTHWORMS AND THEIR ALLIES [ch. on each of the segments xvii, xviii, xix are a pair of pores of which those on the xviiith segment are the least conspicuous. The large pair of pores on each of segments xvii and xix occupy the position of the ventralmost pair of setae, which are here absent, or rather replaced by a very long curved and ornamented seta, which projects out of the orifice. These two pairs of pores are the outlets of the prostatic glands as they have been termed. The. 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 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 Beddard, Frank Evers, 1858-1925. Cambridge University Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1912
