Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 73 – 74American Philosophical Society, 1934 |
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Сторінка 137
... canal , not hitherto found in the Arthrodira , but apparently an extension of the marginal canal , arises at or near the junction of the latter with the post - suborbital canal and passes forward above the orbits nearly to the posterior ...
... canal , not hitherto found in the Arthrodira , but apparently an extension of the marginal canal , arises at or near the junction of the latter with the post - suborbital canal and passes forward above the orbits nearly to the posterior ...
Сторінка 140
... canal system is well preserved , and is like that in E. brachycephalus . The pre - marginal canal is present , but is not a direct continuation of the marginal canal . The bones are ornamented with fine tubercles . No doubt certain ...
... canal system is well preserved , and is like that in E. brachycephalus . The pre - marginal canal is present , but is not a direct continuation of the marginal canal . The bones are ornamented with fine tubercles . No doubt certain ...
Сторінка 145
... canal such as is seen in Euryaspis . The pre - orbital must have traversed a post - nasal plate . Otherwise the canal pat- tern agrees well with that in other Acanthaspids . Of the trunk armor the following plates are known : median ...
... canal such as is seen in Euryaspis . The pre - orbital must have traversed a post - nasal plate . Otherwise the canal pat- tern agrees well with that in other Acanthaspids . Of the trunk armor the following plates are known : median ...
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abdominal segments amazili Amer American Amphitherium Anax Anax junius Arthrodires basal bone Calvert canal central cerci cercoids cheek teeth chromosomes cingulum Coccosteus Cope Coryphodon crown cusps Deltatheridium dental denticles dentition Dinichthys distal dollar dorsal shield Dragonflies Eocene Euryaspis brachycephalus Bryant evidence evolution exuviæ facet fish fissure fossil genus gold head head-roof hind hypocone imago incisors inner instar internal Jurassic Lafayette larva larvæ larval instar lateral length longipes longitudinal lower molars mammal-like reptiles mammalian mammals mandible margin median ment metacones metaconid mid-dorsal moult Odonata origin Osborn ostracoderms pale Paleocene Pantolambda pantotherians paracone plate polyisomerism posterior premolars present price level primitive Prof protocone railroads reared setæ side Simpson Society species specimen spine stabilization stage statute surface Table talonid theory of trituberculy tion Titanoides tooth transverse triconodonts trigonid tritubercular tubercles upper and lower upper molars William