134 



SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. 



2iV"''. Subfamily Prodik'TINvE Waageii, 1884. 



rrodnctidie witli the anchoring spines more or less abundiint over 

 the ventral valve and sometimes also over the dorsal valve. 



Etheridgina (Ehlert, 1887. 

 Ohonopectus Hall and Clarice, 



1802. 

 Strophalosia King, 1844. 



Orthothiix (Jeinitz, 1847. 

 Leplivnalosiii King, 1845. 



Daviesiella Waagen, 1884. 

 Prodnctella Hall, 1867. 

 Productus Sowerby, 1812. 



I'yxis ('h(>innitz, 1784. 

 Producta (i. B. Sowerby, 182") 

 Arhiisculites Murray. 1831. 

 I'rotonia Linck, 1830 (imf 



Hcsque). 

 Mar<ijinifera AVaaiien, 1884. 

 Proboscidella (Ehlert, 1887. 



Rati- 



Aulosteges von Helmersen, 1847. 

 f Aulacorhynchus Dittmar, 1871. 

 Isogramma Meek and Worthen, 1873. 



2a'-. Family KIOHTHOFENIDiE Waagen, 1885. 

 Stro])liomenacea probably derived through the Prodn('tida% and 

 remarkably modified by ventral cementation. The form of the shell 

 is that of cyathophylloid corals with an operculiform dorsal valve- 

 Shell structure cystose. 

 Kichthofenia Kayser, 1881. 



la. Family ORTHID^ Woodward, 1852. 



Orthisidir (partim) d'Orbigny, 1847; Ortliiua^ and Euteletina' Waagen, 1884. 

 Strophomenacea usually with large open delthyria; deltidium only 

 developed in y(ninger growth stages. 



Orthis Dalman, 1828. 



Ortbambonites Pander, 1830. 



( Plectorthis Hall and Clarke, 

 ] 1802. 



( HebertellaHall and Clarke, 1802. 

 /Schizophoria King, 1850. 

 j Orthotichia Hall, 1802. 

 Enteletes Fischer de Waldheim, 

 1830. 



Syntrielasma Meek, 1865. 

 Platystrophia King, 1850. 

 Orthotropia Mall and Clarke, 1805. 



( Dinorthis Hall and Clarke, 1802. 



< Pla'Siomys Hall and Clarke, 1892. 



C Ortliostrophia Hall, 1883. 

 ( Dalmanella Hall and Clarke, 

 I 1802. 



Heterorthis Hall and Clarke, 

 1802. 



Bilobites Linnc", 1775. 



L)ic(el()sia King, 1850. 



Khipidomella (Ehlert, 1800. 



Rbipidouiy.s U^hlert, 1887 (not Wag- 

 ner). 



Sui)erfamily PENTAMERACEA Schuchert, 180G.' 



Tnillacca Scbuchert, 1893; Ancistropegniata (i)artini) Zittel, 1895; Aphaneropeg- 

 mata (partim ) and Productacea (partim) Waagen, 1883; Kleiitberobranchiata 

 (partim) Neumayr, 1883. 



Derived Protremata with spondylia to which are attached the adduc- 

 tor, diductor, and ventral pedicle muscles. Commoidy cruralia are 

 present. 



1. Family CLITAMBONITIDyE Winchell and Schuchert, 1893. 



Ortbisida- (partim) d'Orbigny, 1849; Ortbisime Waagen, 1884. 



Primitive Pentameracea with long, straight cardinal areas and a 

 well developed deltidium. No cruralium. 



> Text-book of Paleontology, by Zittel and Eastman, 1896, p. 320. 



