. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 84 PENNATULIDA. broader; it is the dorsal belt of zooids, or, more correctly, the lower part of this belt; in several large specimens it may easily and unmistakably, though as a narrow stripe, be traced between the npper polyps to the base of a certain one, the original terminal polyp; in other specimens this tongue may be traced to the end of the rhachis among the polyps, but which of these is the terminal polyp can- not be determined with absolute certainty; not so much because this polyp has been atrophied, but that it si
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 84 PENNATULIDA. broader; it is the dorsal belt of zooids, or, more correctly, the lower part of this belt; in several large specimens it may easily and unmistakably, though as a narrow stripe, be traced between the npper polyps to the base of a certain one, the original terminal polyp; in other specimens this tongue may be traced to the end of the rhachis among the polyps, but which of these is the terminal polyp can- not be determined with absolute certainty; not so much because this polyp has been atrophied, but that it simply has been somewhat displaced during growth. The other zooid-areas are, as mentioned, all somewhat smaller (narrower) than the dorsal one, but most conspicuously smaller are one, two, or three areas on the opposite — ventral — side of the rhachis. In my specimen Nr. 5 the fifth zooid- area to the left of the dorsal one is the smallest; in Nr. 6 the fourth and fifth are smallest, in Nr. 3 the fourth, fifth, and sixth; in Nr. 4 the sixth and seventh areas are quite narrow, and between their upper end is a quite young rudiment (in form like a zooid, see below); in Nr. 8 the fifth and sixth areas are also quite narrow, and between them is seen a quite young polyp; in Nr. 10 the sixth area is divided above into two narrow points by a naked streak; at the upper end of this streak is found an isolated large zooid (or a rudiment of a polyp). These smallest zooid-areas must show the region where the latest appearing polyps of the lower circle are found, without regard to whether these polyps may have reached the same size as those placed nearest to the dorsal tongue or not. The place corresponds also to the zone in the younger stages where new individuals of the lower circle arise; and in the specimens Nr. 4 and 8 new individuals are seen to arise here, as well as new, quite narrow zooid-areas; but in Nr. 4 the circumstance is to be noted that the new individual is formed like a
Size: 1802px × 1387px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectscienti, bookyear1904
