Archive image from page 207 of The Danish Ingolf-Expedition (1921). The Danish Ingolf-Expedition danishingolfexpe0509ingo Year: 1921 200 ACTINIARIA Anatomical description: The ectoderm of the column is almost lost, only in the uppermost part there are some fragments proving it to be thin. The mesogloea is very thick, of the same consistency as in Actinostola, fibrillar with scattered, small, often round cells. The endodermal circular muscles are weak. The sphincter is comparatively weak, the meshes placed in groups showing a tendency to transversal strati- fication; it is the strongest on th
Archive image from page 207 of The Danish Ingolf-Expedition (1921). The Danish Ingolf-Expedition danishingolfexpe0509ingo Year: 1921 200 ACTINIARIA Anatomical description: The ectoderm of the column is almost lost, only in the uppermost part there are some fragments proving it to be thin. The mesogloea is very thick, of the same consistency as in Actinostola, fibrillar with scattered, small, often round cells. The endodermal circular muscles are weak. The sphincter is comparatively weak, the meshes placed in groups showing a tendency to transversal strati- fication; it is the strongest on the upper part and gradually becomes weaker downwards. It occupies only one part of the breadth of the mesogloea and seems to be wholly separated from the entodermal circular muscles (textfig. 189). The ectoderm of the tentacles is high and provided with numerous typical nemato- cysts, which are rather broad in comparison to their length (26—34 X 4—Sn), and with very numerous spirocysts of very variable size (from 19 X 1,5—2 /z to 67 X 7 fi). The ectodermal longitudinal muscles are not strong, the folds are rather low and commonly not branched, but rather close (textfig. 191). There is no great difference in the development of the muscles on the adaxial and abaxial sides; at the base the muscles, however, are a little stronger on the Textfigs, 189—191. Epiparactis dubia. Transverse sections of sphincter (fig. 189), of part of the oral disc (fig. 190) and of part of a tentacle (fig. 191) cm: circular muscles of the column. adaxial side, and the mesogloea likewise a little thicker on the abaxial side of the base. Still we cannot speak of basal thickenings of the mesogloea. The meso- gloea of the tentacles is commonly rather thin. The radial muscles of the oral disc is also ectodermal (textfig. 190), in its outer part stronger than in the tentacles and provided with rather high, close folds, of about the same dimen- sion at the insertions of the mesenteries as at the ridg
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Keywords: 1900, 1920, 1921, americana, archive, arctic_ocean, biodiversity, blc, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, copenhagen_h_hagerup, danish_ingolf_expedition_1895_1896_, drawing, historical, history, illustration, image, ingolf_cruiser_, mblwhoi, mblwhoi_library, page, picture, print, reference, scientific_expeditions, vintage
