A treatise on zoology . Fig. 2S!1. Restoration of Trissolepis Kounoviensis, Fr. (After Fritsch.) , anal fin ; ax, scale-coveredtail; , hypochordal fin ; , dorsal, j)./, pelvic, and , pectoral fin ; /, fulcral scale. Amhliiptcnis, Ag. ; Europe. Acrolepis, Ag. ; Europe and N. America ;Permian and Elonichthys, Geibel; Carboniferous inEurope and N. America ; Permian in Europe. Gyrolepis, Ag. ; Trias,Europe. Apateoleins, A. S. W. ; Atherstonia, A. S. W. ; Myriolepis, Eg.; 312 PALAEONISCOIDEI Trias, Wales. Goccohpis, Ag.; Trias, Wales, and Lower Lias,England. O
A treatise on zoology . Fig. 2S!1. Restoration of Trissolepis Kounoviensis, Fr. (After Fritsch.) , anal fin ; ax, scale-coveredtail; , hypochordal fin ; , dorsal, j)./, pelvic, and , pectoral fin ; /, fulcral scale. Amhliiptcnis, Ag. ; Europe. Acrolepis, Ag. ; Europe and N. America ;Permian and Elonichthys, Geibel; Carboniferous inEurope and N. America ; Permian in Europe. Gyrolepis, Ag. ; Trias,Europe. Apateoleins, A. S. W. ; Atherstonia, A. S. W. ; Myriolepis, Eg.; 312 PALAEONISCOIDEI Trias, Wales. Goccohpis, Ag.; Trias, Wales, and Lower Lias,England. Oxygnatltus, Ag. ; Gentrolepis, Eg. ; Lower Lias, England. Sub-Family Trissolepinae. Very like Palaeoniscinae ; but tliereare no fulcra except on the upper caudal lobe, the lepidotrichia are. 53 2 £ — 2c5 ; r i - 9 ^ 5 £ X VXf. i 3 ° — ,S unbranched, and the scales behind the head have toothed edges, while thoseon the hinder trunk-region are cycloid, and those on the tail remainrhomboid. The palate is strongly toothed (Fritsch [139]). Trissolepis, Fritsch ; Permian, Bohemia (Fig. 289). Family Platysomidae. In everything but the sliape of the head PA LAEONISCOIDEI 3 3 and trunk, which become very much compressed and deepened, and theaccompanying extension of the dorsal and anal fin, the Platysomidaeclosely resemble the Palaeoniscidae (Fig. 290). Eurynofus, Mesolepis, andPlatysomus are three stages in change of form. As the body deepens thescales become transversely ehmgated, the articular pegs being at theirupper end (Fig. 191). The jaws become more pointed, and the pelvic finsbecome reduced in size {Pl(it)jsoi,iu»), or apparently disai)pear altogether asin Oheirodus. No symplectic is known, the hyomandibular becomes nearlyvertical, and the mouth is diminished (Fig.
Size: 1139px × 2194px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
