BRAOHIOPODA. 783 
Tetractinella, Bittner. 1890. 
Synonym; Plicigera, Bittner, 1890. 
Shells with four corresponding ribs on each valve; spiral cones 
directed laterally; jugal branches erect, uniting in an elongate 
Fias, 316-318.— Tetractinella trigonella, Schlotheim (sp) (B81TTNER). 
narrow and nearly vertical saddle from the posterior extremity 
of which short intercalary lamella are given off. 
Type. Tetractinella trigonella, Schlotheim (sp.). 
Distribution. Triassic. 
Subgenus Pentactinella, Bittner. 1890. 
Fias. 319, 320.—Pentactinella quinquecostata, Miinster (sp.). (BITTNER ) 
Shells with five corresponding ribs on each valve. Interior as 
in TETRACTINELLA. 
(Type, Pentactinella quinquecostata, Minster (sp.). Triassic.) 
Subgenus Anomactinella, Bittner. 1890. 
Fias, 331, 322.—Anomactinella flexuosa, Miinster (sp.). (BirTNER.) 
Shells with a number of ribs sharply developed toward the 
margins. Interior probably as in TErRacTINELLs. 
(Type, Anomactinella flecwosa, Mister (sp.). Triassic.) 
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