CŒLOM-dwelling trematodes are very rare. The only monogenetic form ever found in the cœlom of a vertebrate is Dictyocotyle cœliaca Nybelin, 1941. A solitary specimen was found at Göteborg on April 1, ...
THE object of the author was to establish the fact that the system of blood-containing spaces pervading the body in Mollusca and in Arthropoda was not, as sometimes (and indeed usually) supposed, ...
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