Stkphknson — Certain Actiniaria collected off Ireland. 159 



55. Verkill, A. E. — Descriptions of imperfectly known and new Actinians, 



with critical notes on other species. Anier. Journ. Sci. and Arts, 

 Vol. vii, 1899, pp. 41, 143, 205, :'.75. 



56. Walton, C. L. — Actiniae collected by the s.s. "Huxley" in the North 



Sea during the summer of 1907. Journ. Mar. Biol. Assoc, 

 Vol. viii, 1908, p 215. 



57. Wassilieff, A. — Japanische Actinien. In Doflein, Beitr. Naturg. 



Ostasiens. Abhandl. K. Bayer Akad. Wiss. Suppl. Bd. i, 

 1908. 



EXPLANATION 



Explanation of Letterin 



a. actinopharynx. 



b. cavity of basal cup. 

 b. en. body- wall endoderni. 



b. w. body-wall. 



c. " coronal " tubercle, 

 c'. coelenteron. 



c. /. ciliated lobe of mesenterial 



filament. 



d. d. dorsal directive. 

 ec. ectoderm. 



e. c. m. endodermal circular muscle. 

 /'. mesenterial filament. 

 //. /. glandular lobe of mesenterial 



filament. 

 /. m. longitudinal musculature. 

 in. mesogloea. 

 vies, mesentery. 

 m. f. mesenterial filament. 

 n. mesogloea. 

 n. /. nerve layer. 

 o. oral disc. 

 obj. objective. 

 oc. eyepiece. 

 0. d. oral disc. 

 p. pennon. 



ji. bm. parieto-basilar muscle. 

 p. d. pedal disc. 

 p. m. parietal muscle. 

 /■. " ridge," or basal swelling of a 



OF PLATES. 

 g and Abbreviations. 



fourth-cycle tentacle in Art in - 



angr richardi. 

 r. in. radial musculature. 

 s. actinopbaryngeal groove (siphono- 



glyphe). 

 si. actinopharyngeal groove (siphono- 



. glyph*)- 



sph. sphincter. 



t. tentacle. 



t". tentacle. 



t. b. tentacle base. 



t. hi. transverse musculature. 



'f.'IS. transverse section. 



t. sph. tentacular sphincter. 



11. is placed in the mesogloea in 

 PI. XVIII, fig. 5, to indicate 

 which is the upper extremity 

 of the sphincter. 



v, d. ventral directive. 



x-x. indicates two mesenteries be- 

 longing to the same pair. 



x marks the upper extremity of the 

 sphincter in the single figure 

 of Bolocera longicoi-nis ( PI. XX, 

 fig. 7). 



y. indicates a single mesentery be 

 longing to a different pair from 

 those marked x-x in PI. XVII I 

 fig. 17. 



