BRACHIOPODA. 833 
Norella, Bittner. 1890. 
Small, smooth rhynchonellids, with conspicuous median fold 
and sinus, and sloping hinge-line. Interior unknown. 
Fras. 425, 426.— WNorella refractifrons, Bittner. (BITTNER.) 
Type, Worella sellaris, Laube (sp.). 
Distribution. Triassic. 
Rhynchonellina, Gemellaro. 1871. 
Shells transverse, unequally convex, the pedicle-valve being 
the deeper. Cardinal margin nearly straight. Beak incurved, 
beneath it lying a concave triangular area, bearing an incipient 
deltarium. Crura long, curved toward the pedicle valve, their 
Fia. 427.— Rhynchonellina Suessi, Gemellaro. (GEMELLARO). 
extremities nearly touching that valve. Near their bases these 
crura give off short jugal apophyses. 
Type, Rhynchonellina Suesst, Gemellaro. 
Distribution. Jurassic. 
Dimerella, Zittel. 1870. 
Shells small, sceniduform, with high ventral umbo and a 
straight hinge line which equals the full diameter of the valves. 
Surface plicate. Pedicle-passage large; deltidial plates feebly 
developed. Brachial valve with an elevated median septum 
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