134 



SYNOPSIS OF AMERICAN FOSSIL UKACHIOPODA. liiiu..87. 



2ii"'^'. Subfamily l*RODUC'TiNyi5 Waagen, 1884. 



Prochictidu' with the anchoring si)ines more or less abundant over 

 the ventral valve and sometimes also over the dorsal valve. 



Daviesiella Waagen, 1884. 

 Productelhi Hall, 18G7, 

 Productus Sowerby, 1812. 



I'yxis Chemnitz, 1781. 



Producta G. B. Sowerby, 1825. 



Arbnsculites Murray, 1831. 



Protouia Liuck, 1830 (not 

 iiesque). 



Marjiiiiifera Waagen, 1884. 

 Proboscidella (Ehlert, 1887. 



Raii- 



Etheridgina a^hlert, 1887. 

 Chonopectus Hall and Clarke, 



18i)2. 

 Strophalosia King, 1844. 



Orthothrix Geinitz, 1847. 



LeptiiMialosia Kiug, 1845. 

 Aulosteges von Helmersen, 1847. 

 ?Aulacorhynohus Dittmar, 1871. 



Isoyramiua Meek and Wortben, 1873. 



2a'^^ Family RICHTHOFENID^. Waagen, 1885. 

 Strophomenacea jtrobably derived through the Productida', and 

 remarkably modi tied by ventral cementation. The form of the shell 

 is that of cyathophylloid corals with an operculiform dorsal valve 

 Shell structure cystose. 

 Richthofeuia Kayser, 1881. 



la. Family OKTHID^ Woodward, 1852. 



Ortbisidit (partiiii) d'Orbigny, 1847; Ortbina' and Eutelotina- Waagen, 1884. 



Strophomenacea usually with large open delthyria; deltidium only 

 developed in younger growth stages. 

 Orthis Dalman, 1828. 



\ 



Orthambonites Pander, 1830. 



Plectorthis Hall and Clarke, 

 1892. 



( HebertellaHall and Clarke, 1892. 

 /^Schizophoria King, 1850. 

 j Orthotichia Hall, 1892. 

 Enteletes Fischer de Waldheim, 

 1830. 



Syntrielasnia Meek, 1865. 

 Platystrophia King, 1850. 

 Orthotropia Hall and Clarke, 1895. 



I 



Dinorthis Hall and Clarke, 1892. 



Phfsiomys Hall and Clarke, 1892, 

 Orthostrophia Hall, 1883. 

 Dalmanella Hall and Clarke, 

 1892. 



< Heterorthis Hall and Clarke, 

 1892. 

 Bilobites Linnc, 1775. 

 Dicd'losia King, 1850. 

 Rhipidomella CKhlert, 1890. 



Kbipidomys (l^blert, 1887 (not Wag- 

 ner). 



Superfamily PENTAMERACEA Schuchert, 1896.' 



Trnllacea Scbncbert, 1893; Ancistropegniata (partini) Zittel, 1895; Apbaneropeg 

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

 (partim) Neumayr, 1883. 



Derived Protremata with spondylia to which are attached the adduc- 

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

 present. 



1. Family CLITAMBONITID^ Winchell and Schuchert, 1893. 



Ortbisidie (partim) d'Orbigny, 1849; Orthisin.-i' AVaagen, 1884. 



Primitive Pentameracea with long, straight cardinal areas and a 

 well developed deltidium. No cruralium. 



' Textbook of Paleontology, by Zittel and Eastman, 1896, p. 320. 



