L52 DB A. MILNE3 MARSHALL ON" THE PENNATULIDA, ETC. 



Fig. i'.). —Dubenia abyssicola var. smaragdina. Portion of rachis from dorsal surface. Shows 



arrangement of polyps and zooids. x 17. 

 Fig. 20. — Dtibenia abyssicola var. smaragdina. Tentacle of polyp, showing rib of calcareous 



spicules, x 70. 

 Fig. 21. — Dubnn.it abyssicola var. smaragdina, one of large spicules of spicular plate, x 55. 

 Fig. 22. — Funiculina quadrangularis. Portion of rachis of young specimen from left side. 



Shows shape of polyp in state of extreme contraction; also extension of spicules 



down whole length of polyps and on to rachis. x 7. 



Plate XXIV. 

 Kophohelemnon stellifcrum var. durum. 



Fig. 23. — Whole specimen, dorsal surface ; showing typical arrangement of polyps, x 2. 



Fig. 24. — Tentacle of polyp; showing rib of calcareous spicules extending whole length of 

 tentacle and along pinnules, x 20. 



Fig. 25. — Transverse section of tentacle, showing tentacular cavity and extension into pinnules, 

 also arrangement and shape of spicules, x 70. 



Fig. 26. — Two large spicules from spicular rib of tentacle, x 55. 



Fig. 27. — Transverse section of stalk ; showing arrangement of spicules and muscles ; als^ 

 shape of stem and of main longitudinal canals, x 30. 



Fig. 28. — Transverse section of rachis passing through three polyps at different portions of 

 their length. The left-hand polyp is cut horizontally (cf. fig. 23), and shows stomo- 

 daeum, mouth, and tentacles ; the right-hand polyp is cut transversely through the 

 lower portion of the stomodaeum, and shows arrangement of retractor muscles and 

 position of plane of symmetry of polyp ; the third or dorsal polyp is cut trans- 

 versely at a still lower leyel, and shows the two mesenterial filaments and a 

 number of ova. The section also shows several zooids and the shape and position 

 of the stem aud of the main ventral canal, x 30. 



Plate XXV. 



Umbellula gracilis. 



-Whole specimen; dorsal surface, x 1. 



-Eachis ; ventral surface. Shows arrangement of polyps and zooids. x 2. 

 -Tentacle of polyp ; shows alternation of large and small pinnules, x 10. 

 -Apex of rachis; ventral surface. Shows shape and arrangement of lar^e zooids 

 with pinnate tentacles, x 14. 

 Fig. 33. — Longitudinal section of one of the large zooids; shows the tentacle with its pinnules 



mouth, stomod;eum, mesenterial filament, &c. x 55. 

 Fig. 34. — Section of septum bearing ova, and of the part of the body wall of the polyp from 

 which the septum arises. Shows also the disposition of the retractor muscle, 

 x 70. 

 Fig. 35. — Section of ovigerous septum close to its free edge, showing various stages in the 

 early development of the ova. x 470. 



Fig. 



29. 



Fi". 



30 



Fig. 



31 



Fig. 



32 



