. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. from Achanarras Quari-y^ Caithness. 485 there being five on the right and only four on the left. Thej are proportionally narrower than in Megalichthys^ but not so narrow as in Osteoleins. 12. Clidrolepis TrailU^ Ag.—Two specimens of this from Achanarras are in the Museum of Science and Art, and one in the collection of the Geological Survey, and I also observed some fragments of the same species in the dtSbris of the quarry. I have no hesitation in referring these specimens, t
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. from Achanarras Quari-y^ Caithness. 485 there being five on the right and only four on the left. Thej are proportionally narrower than in Megalichthys^ but not so narrow as in Osteoleins. 12. Clidrolepis TrailU^ Ag.—Two specimens of this from Achanarras are in the Museum of Science and Art, and one in the collection of the Geological Survey, and I also observed some fragments of the same species in the dtSbris of the quarry. I have no hesitation in referring these specimens, the first of the genus ever observed in Caithness, to the same species as that which is so common in the Orkney as well as in the Moray-Firth beds. 13. Palceospondylus Gunniiy g. et sp. n. (fig. 4, mao-nified). —This is hitherto the only novelty which has turned up in the quarry, and it is of excessive in- terest, though unfortunately it must Fig, 4. take its place among the fossil fisiies incertce sedis. It might indeed be asked, Where is the evidence that it is even a fish ? though there is no doubt of its being a Vertebrate. This little organism varies from 1 to 1^ inch in length, of which measure- ment the head occupies about a fifth. Little can be made out of the struc- ture of the head, which looks like a flat crushed mass of bony bars; it Palcsosponch,lus Gunnii, is a little longer than broad, with a Iraq., twice nat. size, slight lateral hour-glass constriction, rounded in front and truncate behind ; from the front two small, short, pointed processes project, one on each side, like a pair of little feelers, while behind a little shield-like body passes back over the first three or four vertebrse. Nothing at all comparable to jaws, upper or lower, can be seen. The vertebral axis, whicli passing back from the head becomes attenuated to a fine point posteriorly, is composed of distinctly ossified and separate vertebral centra, which, however, appear to me to be hollow o
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