. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 15. Sagariiogeion rnhtislus. Sphincter. 'ficult to determine Init I have oliservcd between 6 and 2 (seldom 1 cinclis) in each row. I have sectioned a ]iiece just above the ujiper end of the scapus but not found any cinclides here: It is therefore jjrobable that the cinclides occur only at the limbus of this .species. The soapulus is devoid of a cuticle and irregularly wrinkled, the margin is rather distinct. The tentacles were 170-180 in the uncontracted specimen. They are conical to
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 15. Sagariiogeion rnhtislus. Sphincter. 'ficult to determine Init I have oliservcd between 6 and 2 (seldom 1 cinclis) in each row. I have sectioned a ]iiece just above the ujiper end of the scapus but not found any cinclides here: It is therefore jjrobable that the cinclides occur only at the limbus of this .species. The soapulus is devoid of a cuticle and irregularly wrinkled, the margin is rather distinct. The tentacles were 170-180 in the uncontracted specimen. They are conical to more cylindrical in the contracted state and rather long, the inner tentacles twice as long as the outer ones. They are set and arranged in several cycles, but the arrangement is probably irregular as only one or two siphonoglyphs, the latter asymmetricallv arranged, were present. More than half of. Fig. 16. Sagdiiidgdoii nilnisliis. Section of a perfect mesentery in tlie region of lowest part of the actini)i)haiynx. the oral disc is occupied liy tentacles. The oral di.^c is radially sulcated, the furrows correspond to the insertions of the mesen- teries. The actino]iharvnx is longitudinally ridged. The sectioned specimen was jirovided with a well d<'\oloped siplmnoglyph. Anatomical description: The ectoderm of the .<capus is of ordinary thickness. The cinclides are partly invaginations from the ectoderm, partly evaginations from the endoderm, mostly the (fig. 14). The tenaculi recall as to their structure those of D. praeloiign, but the .stratilied cuticle forms not so many strata as those of s|)ecies (PI. V lig. .3). The mesogloea of the column is very thick at lea.^t in the contracted state of the body and contains numerous cells poor in protoplasm. The circular nmseles of the column are ordinarily dc\eloi)ed as also is the sphincter. It is broad and extendi'd over somewhat more than the half of the scapulus, ends rather abrn])tlv and is wholly dif
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
