Memoirs of the Manchester Literary and Philosophical Society, Volume 72Manchester Literary and Philosophical Society., 1928 |
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Page 54
... valves rounded or approximating to shield - shaped in plan and with the width in front of the middle . The dorsal valve is generally shallow and without a conspicuous sinus ; the ventral has a large umbo , and presents rounded ...
... valves rounded or approximating to shield - shaped in plan and with the width in front of the middle . The dorsal valve is generally shallow and without a conspicuous sinus ; the ventral has a large umbo , and presents rounded ...
Page 55
... dorsal valve is usually conspicuous and angular . The ventral valve is angular in transverse section and has the sides concave . The interior of the ventral valve distinguished from Resserella only by the absence of conspicuous vascular ...
... dorsal valve is usually conspicuous and angular . The ventral valve is angular in transverse section and has the sides concave . The interior of the ventral valve distinguished from Resserella only by the absence of conspicuous vascular ...
Page 56
... Valves about 1.2 cm . wide . Hinge rather short . Dorsal valve weakly convex , without mesial sinus . Ventral valve moderately convex , with large depressed beak and low cardi- nal area . External ribbing moderately fine relatively to ...
... Valves about 1.2 cm . wide . Hinge rather short . Dorsal valve weakly convex , without mesial sinus . Ventral valve moderately convex , with large depressed beak and low cardi- nal area . External ribbing moderately fine relatively to ...
Page 57
... anterior and posterior scars separated by a well - defined ridge ; the anterior scars much larger than the posterior . Internal ribbing restricted to peripheral zone . In the ventral valve a pair of short dental plates and a small ...
... anterior and posterior scars separated by a well - defined ridge ; the anterior scars much larger than the posterior . Internal ribbing restricted to peripheral zone . In the ventral valve a pair of short dental plates and a small ...
Page 58
... Valves large , coarsely - ribbed , typically transverse , widest across middle region . Hinge - line relatively short . Dorsal valve moderately or feebly convex for the genus , with shallow , often obscure mesial sinus . Ventral valve ...
... Valves large , coarsely - ribbed , typically transverse , widest across middle region . Hinge - line relatively short . Dorsal valve moderately or feebly convex for the genus , with shallow , often obscure mesial sinus . Ventral valve ...
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Common terms and phrases
Acton Scott adductor africanum alloys atoms augite biotite cell charged particles chromatophore coenobia coenobium coenocytes compound convex crural pits crural plates crystals curve D.Sc Dalmanellida density divaricator Donegal dorsal valve effect electrons emission energy Exterior felspar field gametes genera genus granite Harknessella Harnage heat Heterorthis Horderley hornblende hysteretic intensity interior Internal mould ions kloedeni large number lateral folds lobes M.Sc Manchester mass median Memoirs mesial mould of dorsal mould of ventral mudstone muscle area nuclei observed obtained occurs Onniella Ordinary Meeting origin Ostracods oxygen phase plasticine platinum positions posterior primary Professor W. L. BRAGG pyrenoids radiation ratio relations Resserella reticulatum rib-system ribs ridge River Onny rocks Rosguill scars scattering schist Sciences sectors shell significant sinus Société Society solid solution species specimens stage stars structure sub-atomic swarm-spores temperature valve plasticine cast ventral valve Wattsella wattsi wire xenoliths