Fishes . Fio. IfiS —Oyroptychius vikrolepidotus Aga.^siz. Devonian. Family Megalich- ihyidti. (After Pander.) while in Diplopterus and Glyptopomus it is diphycercal. Osteo-lepis macrolepidotiis and numerous other species occur in theLower Devonian. Diplopterus agassizii is common in the samehorizon. Megalichthys hibbcrti is found in the coal-measures,and Glyptopomus minimus in the Upper Devonian. Palceosteusis another genus recently described. The Onychodontidcc are known from a few fragments ofOnychodus sigmoides from the Lower Devonian of Ohio andOnychodus anglicus from England. Order Actini
Fishes . Fio. IfiS —Oyroptychius vikrolepidotus Aga.^siz. Devonian. Family Megalich- ihyidti. (After Pander.) while in Diplopterus and Glyptopomus it is diphycercal. Osteo-lepis macrolepidotiis and numerous other species occur in theLower Devonian. Diplopterus agassizii is common in the samehorizon. Megalichthys hibbcrti is found in the coal-measures,and Glyptopomus minimus in the Upper Devonian. Palceosteusis another genus recently described. The Onychodontidcc are known from a few fragments ofOnychodus sigmoides from the Lower Devonian of Ohio andOnychodus anglicus from England. Order Actinistia.—In the Actinistia there is a single fin-rayto each basal bone, the axonosts of each ray fused in a single. Fio. 104—CalacantJiui elegans Newberry. From the Ohio Carboniferous, showingair-bladder. (After Dean.) piece. The notochord is persistent, causing the back-bonein fossils to appear hollow, the cartilaginous material leavingno trace in the rocks. The genera and species are numerous,ranging from the Subcarboniferous to the Upper Cretaceous,many of them belonging to Ccvlacanthus, the chief genus of the The Crossopterygii •31 single family Coslacanthidcs. In Ccelacanthiis the fin-rays arewithout denticles. Ccelacanthus granulatus is found in theEuropean Permian. Ccelacanthus elegans of the coal-measuresis foimd in America also. In Undina the anterior fin-rays aremarked with tubercles. Undina penicillata and Undina gidofrom the Triassic are well-preserved species. In Macropoma(lewesicnsis) the fin-rays are robust, long, and little articulated.
Size: 3085px × 810px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectfishes
