586 PROCEEDINGS OF THE NATIONAL MUSEUM 



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Figure 15. — Acerotisa rugosa: a, very small specimen; b, specimen of medium size; c, mature 

 worm. (Explanation on page 597.) 



branches of the intestine, of which a few are shown in the lower left 

 of figure 15c, do not anastomose, at least not to any extent. 



Keproductive system: As there is only one fully mature specimen, 

 I have forborne to section it. However, most of the details of the 

 reproductive system could be ascertained in the cleared, mounted 

 worm. The female gonopore, encircled by radiating cement glands, 

 is located just behind the root of the pharynx (fig. 15c). To each side 

 of it are seen the coils of the spermiducal vesicles. Extending back- 



