20 



.T. LINDAHL, PENNATULID-SLÄGTET UMBELLULA CUV. 



m. lougitudinal muscles, 

 c. conncctive tissue, 

 e., €. epitheliuni. 



Fig. 9. A zoöid and sectioii of the wall of rachis; (! X n. s. 



e. epithelium, liuing thc ducts of rachis, 

 t.m. traiisversal muscles, | 

 c.c. cyliiuler-epithclinra, 



f.e. epithelium, consisting of rouiided, flatteiied cells, 

 )n. the luouth. 



Fig. 10. Trausversc section of a zoöid close to the surface of rachis; 80 X n- s. 

 r.m. radial muscles, 

 l.m. lougitudinal » , 



c. conncctive tissue, 

 c.e. cylindcr-epithelium, 

 c, :., z. three adjaceut zoöids (not detailed). 



Fig. 11. Zoöidbearing area; 6 X u. s. 



z. zoöids, 



//. the l)ases of t«o lateral polypes. 



Tafl. II. 



Unbelhila miniaeea n. sp. Fig. 12 — 19. 



Umbelhda encriniis L. Fig. 20. 



Fig. 12. The entire coral; 0,5 X n. s. 



Fig. 13. The duster of polypes; 2 X n. s.; sce Fig. 19. 



/ — XII lateral polypes {VII thc basal polype, VIII — A7/ imperfectly developed polypes). 

 D.4, D.5, D.6. dorsal polypes, 

 z., z. zoöids, 



s. the upper swelling of the peduncle. 



Fig. 14. The duster of polypes, as seeu from above. 2 X n. s. 



T. terminal polype, 

 / — IV lateral polypes, 

 cl. 2. dorsal polype, 

 z. zoöids. 



Fig. 15. Lateral polypes iu diflereut, stages of development, prcvious to the appearance of their teutaclcs; 

 S X u. s.; see Fig. 13 & 19. 



VII Proximal end of the basal polype, 

 VIII — XII polypes destitute of tentacles {VIII with 5 folds iu the tentacular disk, IX 

 with 4 folds; in each of the other three polypes also 4 very faint folds raay 

 be distinguished). 



Fig. 16. Tentacle of a lateral polype; 5 X u. s. 



i. the oral surface, 

 b. the back surface. 



Fig. 17. A zoöid, scen from above; the epithelium being removed; 90 X n. s. 



Fig. 18. The bulb and the basal swelling of the peduncle, cut across at # for supplying materials to the sec- 

 tions, represented by Fig. 1 — 4; n. s. 



Fig. 19. Diagram, showing the arrangement of polypes, their successive appearance aud relative size. 



r. the distal point of rachis, 

 T. terminal polype, 



/ — XII lateral polypes, VII basal polype, VIII — XII imperfectly developed polypes), 

 D.l. — D.C., d.l. — d.4. dorsal polypes {d.4 imperfectly developed). 

 z. zoöidbearing areas. 



