IQB EXPLANATION OF PLAtES. [December, 



PtATE VIIT. 



Fig. 1. Zoanthus Sohndri: three individuals united to- 

 gether. In a section of one of them one sees 

 at b, the cavity in which the tentacula.are con 

 tracted; a, cavity of the stomach; c, the ova- 

 ries; the foregoing letters «, b, are ^Dlaced on 

 one of the membranes which forms the interior 

 chamber. 



Fig. 2. A group o^ Mammillifera Auricula* 



Fig. 3. Horizontal section of the same, which shows the 

 comparative size, and the number of the inte> 

 rior membranes. 



Fig. 4. Oblique section of the same. 



Fig. 5. A detached part of the same: a, lower apertare; 

 6, one of the interior membranes; c, arcuated 

 organ; J, nervous filaments; e^ upper aperture 

 or mouth; f^ ovaries. 



Fig. 6. A group of the Corticifera^glareola, 



Fig. 7. This figure represents two individuals of the same, 

 one 5een in front, the other in profile. 



Fig. 8. Vertical section of the same. 



Fig. 9. A detached portion of the same: a, lower aper- 

 ture; b^ interior membrane of the chamber; 

 r, arcuated organ; c/, appendix of the stomach; 

 e^ mouth; f^ horizontal section; g, ovaries; 

 i, filaments or nerves. 



Madreporic Animals. 

 Fig. 10, Caryophyllia solitaria: a, animal seen in profile 

 and expanded; b, the expanded animal viewed 

 from above; magnified. 



