. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Generic Position o/Solanocrinus. 85 to me to prove most conclusively that the arms of Solano- crinus costatus are not so entirely devoid of syzygies as he asserts. On Taf. xxvi. fig. 11, he gives a "Schema des Armbaues von 8. costatus, mit ergiinzten Pinnulis," a part of which 1 have copied in fig. 2, A. The first pinnule is represented on the left side of the fifth brachial, and five others follow in succession, alternating on opposite sides of the arm till the tent
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Generic Position o/Solanocrinus. 85 to me to prove most conclusively that the arms of Solano- crinus costatus are not so entirely devoid of syzygies as he asserts. On Taf. xxvi. fig. 11, he gives a "Schema des Armbaues von 8. costatus, mit ergiinzten Pinnulis," a part of which 1 have copied in fig. 2, A. The first pinnule is represented on the left side of the fifth brachial, and five others follow in succession, alternating on opposite sides of the arm till the tenth joint. But there is no pinnule at all upon the broad side of the eleventh joint, which is continuous with that of the twelfth, and this bears a pinnule which is on the opposite side of the arm to that on the tenth joint. If this arrangement be not due to a malformation, which I see no reason to believe, it has only one possible explanation. The eleventh and twelfth joints are united by syzygy, and the eleventh, as is invariably the case with the hypozygal, bears no pinnule. So far as my experience goes, there is no other possible way of accounting for the absence of a pinnule on this joint; and, if Walther's restoration of the arm is justi- fied by the condition of the specimen, I have no hesitation whatever in saying that there must be a syzygial union be- tween this pinnule-less joint and its successor. I think that this will be evident to any one who will compare the copy of Walther's figure (fig. 2, A) with that showing the syzygies in the arm of Antedon rosacea (fig. 3, C). Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
