Plate 9. 



All figures based on colored sketches made from life on board the " Albatross." 

 Fig. 1. Periphyllopsis braueri, natural size. The marginal lappets are somewhat 



restored. The coronal furrow is well marked. 

 Fig. 2. Periphylla hyacinthina (" dodecabostrycha " stage) ; oral view of very young 



specimen, 10 mm. in diameter, to show restriction of endodermic pigraeut to 



the central stomach and rhopalia. 

 Fig. 3. Atolla wyvillei ; seen obliquely from the side, showing exumbral furrows of 



central disc. From a specimen 20 mm. in diameter. 

 Fig. 4. Aeginura grimaldii ; oral view of female specimen. The secondary tentacles on 



the margins of the lappets are somewhat restored, x 4. 



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