Fig. 22. Nidalia atlantica STUDER, ?/,. Belongs to the Museum fär Naturkunde, Berlin. 
» 23. Eunephthya florida (RATHKE), !/,. Belongs to the Bergen Museum. 
» 24. Aleyonium digitatum (LINNÉ), ?/,, young specimen, seen from the side. 
) 25. » » » ?/,, young specimen, seen from above. 
» 26. "The same, a part, 5/, magnified. 
» 27. Anthomastus purpureus (KOR. and DAN.), '/,, the colony seen from above. 
Plate 3. 
Fig. 28. Section through Gersemia uvaeformis, the upper part of a branch. 
» 29. Section through the point of the trunk of Gersemia clavata var. truncata. 
» 30. Section through a branch of Gersemia fruticosa. 
» 831. Vertical section through a part of the colony of Alcyonium digitatum var. norvegicum (KOR. 
» 32. Section through a branch of Gersemia fruticosa. 
» 33. Transverse section through the colony of Aleyonium digitatum var. norvegicum. 
» 384. Vertical section through the colony of the same. 
» 35. Vertical section through the colony of the same. 
» 36. Vertical section through the colony of the same. 
Abbreviations. 
Bs = basal canals. 
Cn = coenenchym. 
DK = direct canals. 
En = entoderm. 
Ek = ectoderm. 
& = gonads. 
GE=empryo. 
Gr = gastral tube = coelenteron. 
IK = indirect canals. 
Ms = mesenterial filament. 
P = polyp (anthocodia) fully developed. 
p = polyp, not developed. 
Pg = gastral tube of a young polyp, recently budded. 
Sp = the cavities from the spicules. 
Contents. 
Introduction 
KUNGL. SV. VET: AKADEMIENS HANDLINGAR. BAND 5l. N:o ll. 
Review of Northern and Arctic leNonacca 
Morphological Section 
Structure of colonies in Aleq otlacea 
Canal system 
Connection between the Tamification, Så canal ANC 
Summary of the development of the canal system 
The colony and its substratum 
Relationship within Aleyonacea 
Systematic Section 
93 
and DAN.) 
