240 WILSON. 
DESCRIPTION OF THE FIGURES. 
In the larvze, the supporting membrane is represented as a heavy black line; the 
jelly, where present, as light brown. In the adult, and in the complete section of 
Cerianthus, the supporting substance is uncolored. All the sections were drawn with 
the camera. Zeiss lenses are referred to, and the figures are reduced to one-half the 
size of the original drawings. 
The following letters have been used uniformly in the figures : — 
c.b, Calycoblast Layer. Oe. (Esophagus. 
C. Costa. Py, Peristome. 
Col. Columella. RP. Randplatte or Extra-thecal Part of 
D.M. Directive Mesenteries. Polyp. 
ec. Ectoderm. S. Septum. 
en. Endoderm. T. Tentacle. 
Mo. Mouth. dT Aeenbneca: 
Mes. Mesentery. Ud, Ventro-lateral Ciliated Tracts. 
Ml. Mesenterial Lobes. 
DESCRIPTION OF PLATE I. 
Fic. A. Corallum of a Manicina colony, viewed from above. Natural size. 
Fic. B. Side view of same, to show the pedicel. The randplatte extends but a 
short distance below the rim of the theca; its lower limit is marked by a slight accu- 
mulation of irregular lamine. 
