. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. II. 23 Manubrium broad, cylindrical, about as long as the bell cavity (textfig. 17), broadly attached to the middle of the subumbrella. According to the state of contraction there may be a slight indication of a stomachal pe- duncle (as in Plate I, fig. 8), or tlie apical wall of the stomach maybe a little arched upwards into the apical jelly (as in textfig. 17). The gonad encircles tlie manubrium, leaving a short part free at both ends. The mouth opening is simple; it is surroun
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. II. 23 Manubrium broad, cylindrical, about as long as the bell cavity (textfig. 17), broadly attached to the middle of the subumbrella. According to the state of contraction there may be a slight indication of a stomachal pe- duncle (as in Plate I, fig. 8), or tlie apical wall of the stomach maybe a little arched upwards into the apical jelly (as in textfig. 17). The gonad encircles tlie manubrium, leaving a short part free at both ends. The mouth opening is simple; it is surrounded by a slightly elevated ectodermal ring containing nematocysts of two different sizes (textfig. i<S). In the male, the surface of tlie gonad is smooth, Imt in the female it is lumched owing to tlie large, ])ronnnent eggs (Plate I, fig. 8; textfig. 17). In a section through a fully developed female gonad are seen; the oocytes (in tlie inner part, nearest to the supporting la- mella) , a large number of degenerative eggs in different stages of decomposition, and a smaller iiumlier of large, fully developed or developing eggs with more or less irregular outlines, greedily devouring the neighbouring degenerative i^^s-17. Euphysa teniaclata. ^.on- gitudinal section of entire , eggs, remains of the nuclei of which are often seen in the jjrotoplasm of passing through the largest ten- tacle and the opposite rudimen- the large eggs. - ^^^^ \n\\h. l-'or description and ex- The ectodermal musculature of the manubrium is confined to four planation of this section, .see the text. — X .)o. narrow, ])erradial, longitudinal l)ands close to the supporting lamella (textfig. 19). I have not been able to detect any other ectodermal muscular elements in the manubrium. In a cross- section we may count al^out 20 muscular cells in each band; the muscular cells are partly immersed into the supporting lamella. As to the degree of develojinient of these muscular bands, there is no obvious
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
