PLATE XX. 



LETTERING ON THE FIGURES. 



eu., cuticle. 



e. isl., .... cell-islet. 



eet., ectoderm. 



ect. m., .... ectodermal muscle. 



enc. sin., . . . encircling sinus. 



end., endoderm. 



end. spit, m., . . endodernial sphincter muscle. 



gl. c, .... gland-cells. 



incr., .... incrustations. 



mes., mesogloea. 



mes.fil., . . . mesenterial filaments. 



mest., .... mesentery. 



mth., .... mouth. 



nem., 

 ner. I., 

 nuc, . 

 mes. sp) 

 mr. m., 



p. b. m. 



r. ect., 

 t u . 

 h, ■ 

 s. d., . 



nematocyst. 



nerve layer. 



nuclei. 



mesoglceal sphincter muscle. 



macrocnemic mesentery. 



oesophagus. 



parieto-hasilar muscle. 



pigment granules. 



reflected ectoderm. 



outer row of tentacles. 



inner row of tentacles. 



sulcar directive mesenteries. 



spermaria. 



Figure. 



1. Epizoanthus minutus, n. sp. (p. 369). Vertical section through, a portion of the column-wall, 



showing the sphincter muscle, tentacles (cut obliquely), disc, oesophageal wall, and mesentery, 

 x 50. Polyp extended. 



2. Epizoanthus minutus, n. sp. (p. 369). Transverse section through a portion of the column-wall 



and the grooved part of the disc in a partially extended polyp, showing the united bases of 

 the tentacles, x 50. 



3. Epizoanthus minutus, n. sp. (p. 369). Transverse section through a portion of a tentacle, x 200. 



4. Epizoanthus minutus, n. sp. (p. 369). Transverse section through a portion of the column-wall, 



and the mesenteries below the oesophagus, x 50. 



5. Parazoanthus Swiftii (Duch. and Michl.), (p. 372). Vertical section through a portion of the 



column-wall, base, and ccenenchyme, x 50. 



6. Parazoanthus Swiftii (Duch. and Michl.), (p. 372). Transverse section through a portion of the 



column-wall and a fertile mesentery, x 280. 



[ 384 ] 



