. The Cambridge natural history. Zoology. Fig. 320.âRestored outline at Birkenia elegans Traq., one-half larger than natural size. , Branchial aperture ; d, dorsal fin. (From Traquair.) the body appears to have been naked (Kg. 321). The two genera belong to the remarkable series of fossil Fishes from the Silurian rocks of Lanarkshire. Eare in the Ludlow series, Birkenia is by far the most common of the Fishes of the over-lying Downtonian. Fig. 321.âRestored outline of Lasayii'us 2^-oblematicns, enlarged. â /â¢, Post-cephalic rods ; r', row of small spine-like scutes ; , mid-ventral spine
. The Cambridge natural history. Zoology. Fig. 320.âRestored outline at Birkenia elegans Traq., one-half larger than natural size. , Branchial aperture ; d, dorsal fin. (From Traquair.) the body appears to have been naked (Kg. 321). The two genera belong to the remarkable series of fossil Fishes from the Silurian rocks of Lanarkshire. Eare in the Ludlow series, Birkenia is by far the most common of the Fishes of the over-lying Downtonian. Fig. 321.âRestored outline of Lasayii'us 2^-oblematicns, enlarged. â /â¢, Post-cephalic rods ; r', row of small spine-like scutes ; , mid-ventral spine-like scales. (From Traqiiair.) Beds. Lasanius is confined to the latter horizon. Euphanerops, from the Upper Devonian of Canada, is probably related to this family, but lateral branchial apertures are not ' III. Antiarchi. The organisms comprising this group ^ resemble the Ostra- codermi in possessing a well-developed carapace of bony plates and a heterocercal tail, as well as in many of the purely negative features which are characteristic of the latter group. The remarkable dorsal shield i-s divided into a small cephalic ' Smith "Woodward, Ann. Nat. Hist. (7), v. 1900, p. 416. ^ Traquair, Monogr. Palaeont. Soc. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
