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EXPLANATION OF PLATE 59 



Fig. 1 . Eperetrmis typus: aboral view of one quadrant of the type-specimen, to show 

 tentacles, canal Kvstem, and manubrium. 



2. Aboral \ iew of a segment of the marginal zone, to show otocysts (0), and young 



(T') and old (T-) tentacles. (N), nematocyst pad; (V), velum. 



3. Dissection of the marginal part of the bell, to show the exumbral furrows {F), 



nematocyet pads {N) and old and young tentacles ( T^, T^) in cross section. 



4. Radial section of bell, showing gonad {G) and base of manubrium (3/). 



5. Part of the margin of the lip. 



6. A half-grown tentacle. 



7. Tip of adult tentacle, showing nematocyst rings and terminal nematocyst knob. 



8. Radial dissection of margin seen somewhat obliquely, to show position of the 



otocyst. {T.), entodermal core of half-grown tentacle; (iV), nematocyst 

 pad of same; (C G), circular canal; {Ca), capsule of otocyst; {OT), otolith; 

 (F), velum. 



