834 ReEporT OF THE STATE GEOLOGIST. 
dividing the interior shell cavity into two chambers. Crural 
processes long and recurved. Shell substance impunctate. 
Fias, 428-433,— Dimerella Giimbeli, Zittel. (BrTTNER and ZITTEL.) 
Type, Dimerella Giimbeli, Zittel. 
Distribution. Triassic. 
Cryptopora, Jeffreys. 1869. 
Synonyms; Atretia, Jeffreys, 1870; Weatretia, Ehlert, 1891. 
Diminutive shells with a subtrihedral contour. Beak promi- 
nent and acute; pedicle-passage large, triangular and without 
deltidial plates. Interior of pedicle-valve with prominent dental 
Fias, 434-437,— Cryptopora gnomon, Jeffreys. (Davipson). 
plates; brachial valve with a short, but greatly elevated median 
septum. 
Type, Cryptopora gnomon, Jeffreys. 
Distribution. Recent. 
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