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4. On New and Little-known Fossil Fishes from the Edinburgh District, No. I
Published online by Cambridge University Press: 15 September 2014
Extract
This genus was instituted by the author for the reception of the Pygopterus Greenockii of Agassiz, and characterised in the “Annals and Magazine of Natural History” for April 1875. It differs from Pygopterus in the form of the scales of the flank, which are much higher than broad, and having their articular spine arising from the whole, or nearly the whole of the upper margin; in the structure of the pectoral fin, in which all the rays are articulated for the greater part of their extent; and in the form of the anal, which is in shape like the dorsal, and is not produced backwards in the peculiar fringe-like manner characteristic of Pygopterus.
- Type
- Proceedings 1876-77
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- Copyright © Royal Society of Edinburgh 1878
References
page 265 note * The bony plate which I here denominate “interoperculum” is the same as that which, in the Palæoniscidæ, has hitherto been considered as “suboperculum.” In Rhabdolepis there occurs between it and the operculum another and smaller plate, which I interpret as “suboperculum,” and which is wanting in most of the genera of this family. (See the author's account of the structure of the Palæoniscidæ in the Mem oirs of the Palæontograpliical Society for 1877).
page 269 note * γονυ, knee; and οδους, tooth.
page 269 note † The reasons for removing these forms from the genera Amblypterus and Palœoniscus, and uniting them with Elonichthys, will be given in my next communication.
page 270 note * “On a New Species of Amblypterus and other fossil fish remains from Pitcorthie, Fife.” Trans. Edin. Geol. Soc. vol. ii. pt. 1 (1872), pp 119–124.
page 270 note † In the Wardie specimens the scales appear for the most part dull, and delicately striated all over; this is, however, internal structure, not external sculpture, and is due to the flaking off of the external ganoine layer. When this is preserved in situ, as it is here and there in many specimens, the surface of the scale is brilliant, largely punctured, and the appearance of striation more or less limited or obsolete, as already described.