EXPLANATION OF PLATE XXVII. 



Gemmaria ivilleyi, sp. nov. 

 Fig. 1. Vertical section, x 28. 

 2. Transverse section through cesophageal region, x 23. 



Lithographed from drawings made by Mr. J. P. Hill. 



KEFERENCE LETTERS. c. Cuticle, ect. Ectoderm, ect. c. Ectodermal 

 canal, ect. m. Ectodermal muscle cell, ent . Entoderm. gr. Sulcar groove. 

 incr. Incrustation. I. Lacuna, m. Mesoglcea. m. c. Mesenteric canal. 

 TO. s. Mesoglceal sphincter, n. Nematocyst. ces. (Esophagus, p. m. 

 Peripheral mesoglcea. pb m. Parieto-basilar muscle, s. d. Sulcar direc- 

 tives, si. d. Sulcular directives, z. Zooxanthella. 



