Identifier: bulletinofgeolo341923geol (find matches)
Title: Bulletin of the Geological Society of America
Year: 1890 (1890s)
Authors: Geological Society of America
Subjects: Geology
Publisher: (New York : The Society)
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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om theEnglish (and German) Lower Wealden, is distinguished from Megalo-saurus by its enormously high neural spines in the dorsal region. Itherefore propose to establish a new genus, AUispinaz, for it. M. oweni(Lydekker), from the British Upper Wealden, belongs to the same genus.This genus apparently develops from Megahsaurus parkeri. It is shown, therefore, that the true genus 3IegaIosaurus occurs onlyin the Middle and Upper Dogger and lowest Malm. The earlier andlater forms, although diifering somewhat, are allied with it. Quite a different form is that described by Sauvage as Megalosaurussuperhus, which I call Erectopus (n. gen.) superhus, from the MiddleCretaceous of northern France. The relationships of this genus are notyet evident. It is characterized by the peculiar form of the femur. Theproximal end above the trochanter major is greatly curved medially andthe fibular condyle at the distal end is considerably more developed than 454 F. vox HVEXE CARXIYOEOUS SAUEISCHIA IX EUROPE
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? a o SPECIMEN FROM FRANCE 455 is the tibial condyle. This condition is the reverse of that found in theMegalosauridae. The distal portion of the shaft is less curved than isthe proximal half. From the curvature it is concluded that the wholehind limb was much straighter than in the Megalosauridae. This isshown also by the position of the articular face of the caput femoris. Thedorsal centra are relatively high. The tibia has a greatly projectingcnemial crest and the crista lateralis is unusually close to the proximalend of the bone. Metatarsal II is nearly half the length of the femur,which is exceptionally long. A portion of the manus is preserved, show-ing very slender phalanges. The first phalange of the thumb is shortand the claws are small. An element found isolated is much like meta-carpal V of the Plateosauridse and of Megalosaurus poikilopleuron; itwould be surprising, however, if a fifth digit were still present. All ofthese remains (and more) have been found so closely asso

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