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Show MR. F. F. LAIDLAW OX THE [Apr. 21y The penis (p.) itself is small and projects into the antral chamber at the upper anterior end of the latter. The penis is a fleshy organ, composed of longitudinal and circular fibres which exhibit numerous nuclei (see Plate XXIII. fig. 2). It is armed with a chitinous stylet. The base of the penis is entered by the short ductus ejaculatorius (d.e.) which leads to the prostate region. It turns shortly after leaving the penis and runs in a backward direction, so that a Text-fig. 51. Male organs of Notoplana evansii. For explanation of lettering, see p. 318. transverse section passing through the penis passed also through the prostate (see PI. XXIII. fig. 2 and also text-fig. 51). The prostate consists of a number, some nine in all, of small chambers (pr.c.) which lie about the ductus ejaculatorius and open into it at their distal ends. The ductus, elsewhere with muscular walls, here is lined only with a very flattened epithelium, outside which lies a second layer of similar * cells belonOg inOg to the |