. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. PORIFERA II consisting of closely and irregularly arranged spicules oi a special form, besides being interwoven with the common axial styli. It might be said that it was the outer part of the crustv layer, which was interwoven with the special spicules, but then it must be remembered that the coating laver may easily be removed as a separate laver. In the axis a rather copious, yellowish mass of spongin is found cementing the needles of the single fibres and coating these fibres with a thi
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. PORIFERA II consisting of closely and irregularly arranged spicules oi a special form, besides being interwoven with the common axial styli. It might be said that it was the outer part of the crustv layer, which was interwoven with the special spicules, but then it must be remembered that the coating laver may easily be removed as a separate laver. In the axis a rather copious, yellowish mass of spongin is found cementing the needles of the single fibres and coating these fibres with a thin layer; on the other hand, the fibres are not, or only to a slight degree, united by spongin, and they seem chiefly to be held together by anastomoses passing very obliquely from one fibre to another. In the skeleton outside the axes no spongin was observed. Spicula: a. Megasclera are styli, dividing into two forms, which, however, are not sharply separated: long, straight styli chiefly forming the axes, both the central one and those of the papillae, and shorter, most frequently evenly curved styli found in the other parts of the body. The long styli are straight or sometimes slightly and a little irregularly curved; they taper a trifle from the middle outward: at the rounded end there is a more sudden tapering, the point is short and oftenest stubby. The length reaches 2""", and may go down to ca. i-2mm, and the thickness is 0-03 down to ca. croi7mm. The short styli are almost always slightly and regularlv curved; they have likewise a sudden tapering at the upper end; the point is somewhat longer than in the long ones, and it is gener- ally sharp. The length is o"56min up to ca. r2mm, and the thickness is in proportion cronâcro24ram. Thus the short styli, while having a length like the shortest ones of the long styli, are of greater thickness; as before mentioned, however, the two groups are not sharply separated; neither are they so with regard to their
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
