Archive image from page 129 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5cpt9daniuoft Year: 1899-1953 ii6 ACTINIARIA well developed, almost as long as half the length of the column or, at any rate, more than one tliird of it, and provided with numerous high folds. Onlj- one siphonoglj'phe is present at the ventral directives, it is distinguished from the other furrows in the actinopharynx by its larger breadth and shows no aboral pro- longation. Anatomical description: The proximal part of the column is — as far as I can see — of usual structure. I
Archive image from page 129 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5cpt9daniuoft Year: 1899-1953 ii6 ACTINIARIA well developed, almost as long as half the length of the column or, at any rate, more than one tliird of it, and provided with numerous high folds. Onlj- one siphonoglj'phe is present at the ventral directives, it is distinguished from the other furrows in the actinopharynx by its larger breadth and shows no aboral pro- longation. Anatomical description: The proximal part of the column is — as far as I can see — of usual structure. In the very few fragments left of the ectoderm of the column I have found very sparse nema- tocysts, about 14—17 // in length. Just Textfigs. 144—145. Siphonaciinnfysis laevis. Fig. 144; section of mesentery iu the reproductive tract. Fig. 145: Transverse section of the outer part of a mesentery. below the tentacles and above the crene- lations on the column fragments of the ectoderm were left. In these fragments I observed closely packed nematocysts and very sparse spirocysts, the latter possibly belonging to the ectoderm of the tentacles. These nematocysts were a little larger (17—20 // long) than those of the other part of the column. Pos- sibly we here have to do with pseudo- acrorhagi, the occurrence of which can- not, however, be added to the diagno- sis, until it has been stated on better preserved material than mine. The cir- cular nmscles of the column are weak and form no sphincter. The ectoderm of the tentacles contains numerous spi- rocysts, 36—38x5//, and nematocysts, 22—29 X 2 fi in size. The longitudinal ectodermal muscles are well developed, with palisade-shaped folds. The oral disc is of the same structure as the ten- tacles, the nematocysts are, however, sparser. The ectoderm of the actinophar>'nx is of ordinary thickness and much thinner than the mesogloea. The granular gland-cells are very numerous, the tjjical nemato- cysts le
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