PLATE XIX. 
LETTERING ON THE FIGURES. 
6. can., . . . . basal canal. mest. fil. . mesenterial filament. 
br.m., . . . .« brachycnemice mesentery. mes. sph. m., . . mesogloea sphincter muscle. 
c.isl., . . . . Cell-islets. MP. Mey « macrocnemic mesentery. 
@ct.,, ectoderm. Gs, 6 = © « esophagus: 
ect. Mm. . . . . ectodermal muscle. @s. gr... . . . cesophageal groove. 
end.,. . . . . endoderm. p-9v . +. . « pigment granules. 
mer., . . . . inerustations. Shits 6 sulcar directive mesenteries. 
mer, lac., . . . lacune produced by removal of sl. d., + +. §gulcular directive mesenteries. 
incrustations. 8.5 . ». » « « spermaria. 
ME3.y. »« « » » mesoglea. iy 0 6 og 0 a Wendie 
Figure. 
11 
Palythoa mammillosa (Ell. and Sol.), (p. 359). Vertical section through a portion of the upper 
free part of a polyp, from which most of the incrustations have been dissolved, x 50. 
. Palythoa mammillosa (Ell. and Sol.), (p. 859). Transverse section through the cesophageal region 
(diagrammatic), x 35. 
. Palythoa mammillosa (Ell. and Sol.), (p. 859). Transverse section through the cesophageal region 
of a younger polyp (diagrammatic), x 35. 
. Palythoa mammillosa (Ell. and Sol.), (p. 859). Transverse section through a partially extended 
polyp, passing through a portion of the grooved part of the disc, x 50. 
. Palythoa caribea, Duch. and Michl. (p. 865). Vertical section through a portion of the upper free 
part of a polyp, x 50. 
. Palythoa caribaa, Duch. and Michl. (p. 365). Transverse section through a fertile mesentery, 
x 50. 
. Palythoa caribea, Duch. and Michl. (p. 365). Transverse section through the cesophageal region 
(diagrammatic), x 35. 
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