. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. The Structure of Dinichthys 177. was not developed as an isolated element, but in the same year he himself figured the spinal in this form as a part of the intero-lateral (). Three years later he also noted Sp in Phlyctaenaspis (1893). Woodward () wrote on this element in Acanthaspis from Spitsbergen, which he, however, did not regard as an Arthrodire but as an Antiarch. In 1902 and 1903, Jaekel described this element as an isolated plate in Coccosteus decipiens Ag. under the name "Ruderorgan
. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. The Structure of Dinichthys 177. was not developed as an isolated element, but in the same year he himself figured the spinal in this form as a part of the intero-lateral (). Three years later he also noted Sp in Phlyctaenaspis (1893). Woodward () wrote on this element in Acanthaspis from Spitsbergen, which he, however, did not regard as an Arthrodire but as an Antiarch. In 1902 and 1903, Jaekel described this element as an isolated plate in Coccosteus decipiens Ag. under the name "; In 1906 and 1907, he spoke of the same plate in some new forms from Wildungen, proposing to name it spinal. Obrutschew (1927) also mentioned Sp in describing a new Arthrodire from Siberia (Angar- ichthys). It is, however, doubtful whether the element he figures is really a spinal. Finally, Heintz; (, .2) described it in Acanthaspida from Spitsbergen, and Broili (1929,1930) in Acanthaspida from Germany. In all the previously mentioned forms, this ele- ment is actually developed as a more or less long spine. It is attached between AL and AVL, which overlaps its basis from the upper and under side (Acanthaspis, Phlyctaenaspis, Pholidosteus. In Coccosteus the relation is not yet clear). In Dimchthys, on the contrary, the spinal in no way resembles a spine'. It is a small, strongly-bent plate (Text-figure 64; Plate IX, figures 23, 24, 25, and 26) which forms the lower, curved part of Newberry's "; It is represented by four well preserved specimens in the collection of the Ameri- can Museum (one attached to AL), and by two good pieces in the Buffalo Museum. Here the present writer wishes to express his gratitude to the Buffalo Museum of Natural Science for its kind permission to describe this plate, and for the fine photographs of it given him by the Museum (Plate IX, figures 23, 24, and 25,). At first glance, the long upwardly-directed, spine-like
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Keywords: ., book, bookcentury1900, booksubjectfishes, booksubjectfishesfossil
