Published online by Cambridge University Press: 15 September 2014
The nephridia of Hirudo medicinalis, as is well known to biologists, are in pairs extending from the second to the eighteenth segments (somites). Each nephridium consists of a much convoluted cellular tube. The cells of the tube are perforated by small ducts. The nephridia (“segmental organs”) open externally on the ventral side of the body.
* Proc. Roy. Soc, No. 240, 1886, and Philos. Trans., 1886.Google Scholar
† “Researches on the Problematical Organs of the Invertebrata, especially those of the Cephalopoda, Gasteropoda, Lamellibranchiata, Crustacea, Inseeta, and Oligochseta,” read before the Eoyal Society, Edinburgh, May 16, 1887.Google Scholar
‡ Proc. Roy. Soc, vol. xlii. (1887), p. 392.Google Scholar