Sentence:  The pseudembryo or echinopzrdium, at first cilisted and spheroidal, becomes after a time wedge-shaped; at its broad end appears the mouth or psaudostome, and at the other the anus or <WSD>pseudoproct</WSD>. 
Meaning of the word marked with <WSD> tags:  The anal opening on the pseudembryo of an echinoderm.