NATURE UF EXCRETORY PROCESSES IN MARINE POLYZOA. 165 
EXPLANATION OF PLATES II and III, 
Illustrating Mr. Sidney F. Harmer’s paper “ On the Nature 
of the Excretory Processes in Marine Polyzoa.” 
(All the figures were drawn from living animals. ) 
PLATE II. 
Flustra papyrea (indigo-carmine experiments : all the figures were drawn 
with a camera lucida, under a Zeiss’ C objective). 
Fic. 1.—264th hour. Front view. The blue leucocytes are grouped 
round the “brown body,” in which can be clearly distinguished the remains 
of the tentacles and two green masses derived from the granules of the 
alimentary canal, which had taken up indigo-carmine in addition to their 
normal pigment. A young polypide bud, slung in a cord of funicular tissue 
attaching it to the “ brown body,” is already present. 
Fie. 2.—286th hour. Front view, showing the condition of the lophophore 
when half rotated (leucocytes not represented). 
Fics. 3—6.—Successive stages of a single polypide. 
Fig. 3. 305th hour. Front view. The “ brown body” is more compact 
than in Fig. 1, and is situated at the extreme proximal end of the 
zoecium. Its two green masses are approaching one another. The 
tentacle-sheath has met the new aperture, which is in process of 
formation. 
Fig. 4. 376th hour. Front view. The ‘“ brown body” has become 
much darker, and its two green masses (which are not very distinctly 
visible, lying, as they do, at the other side of the ‘‘ brown body ”’) 
are beginning to fuse. The cecum of the stomach has met the ‘‘ brown 
body,” and the proventriculus is growing out to meet the cesophagus. 
Fig. 5. 448th hour. Back view. The cecum has nearly half covered 
the ‘brown body.” The intestine is bent over to one side, and the 
rectum contains the ‘‘ meconium.” 
Fig. 6. 496th hour. Back view. The “brown body” is now much 
nearer the middle of the zocecium than in earlier stages, and has a 
process projecting into the lumen of the alimentary canal, indicating 
its approaching absorption (leucocytes not represented). 
’ 
For later stages in the absorption of the “brown body” in this 
species, see Haddon’s figs. 9, 10, and 11 (this Journal, 
vol. xxiii, Pl. XXXVIT). 
