SCHUCHERT.l 



CLASSIFICATION OF PROTREMATA. 



133 



2^ Subfamily Orthothetin^ Waagen, 1884. 



Strophoineuinae (partim) Waagen, 1884. 



Strophomeuoids with the vertral valve convex during early growth, 

 becoming subsequently concave. 



? Orthidium Hall and Clarke, 1892. Streptorhynchus King, 1850. 

 Strophomena Blainville, 1825. j Derby a Waagen, 1884. 



Heinipronites Meek, 1872 (not Pan- Kayserella Hall and Clarke, 1892. 

 der, 1830). Meekella White and St. John, 1870. 



Orthothetes Fischer de Waldheim, j^^^^i^^i^ Hall, 1859. 

 ^'^^i- Dicraniscus Meek, 1872. 



Orthis King, 1850 (not Dalraan, 1828). Mimulus Barrande, 1879. 

 Hipparionyx Vanuxem, 1842. ; g^reptis Davidson, 1881. 



3. Family THECTDIID.E Gray, 1840. 



Cemented Strophonieuacea in which the interior of the shell is 

 impressed with variously indented brachial furrows. 



3=^, Subfamily LYTTONiiNyE Waagen, 1883. 

 Thecidiidse with the brachial markings common to both valves. 



Lyttonia Waagen, 1883. 

 Leptodus Kayser, 1882. 



Oldhamina Waagen, 1883. 



3\ Subfamily Thecidiin^ Dall, 1870. 

 Thecidiidte with the brachial markings restricted to the dorsal valve. 



Thecidia Defrance, 1822. 

 Thecidiiuu Sowerby, 1824. 

 Lacazella M.-Chalmas, 1880. 

 Thecidiopsis M.-Chalmas, 1887. 

 Thecidella M.-Chabnas, 1887. 



Eudesella M. Chalmas, 1880. 

 Pteropbloios Giimbel, 1861. 



Bactryninm Emmerich, 1855. 



(In error. Not Bactrillium He«r. ) 



Davidsonella M. Chalmas, 1880. 



2a^ Family PRODTCTID^ Gray, 1840. 

 Prodnctina Giebel, 1846. 

 Strophomenacea with hollow anchoring spines. 



2a"''. Subfamily ChonetinyE Waagen, 1884. 



Cliouetida? Bronn, 1862; Hall and Clarke, 1895. 



Productidie with the anchoring spines restricted to the ventral 

 cardinal margin. 



Chonetes Fischer de Waldheim, Chonostrophia Hall and Clarke, 



1837. 

 LeptiBna McCoy, 1844 (not Dalman, 

 1828). 

 Anoplia Hall and Clarke, 1892. 

 Chonetella Waagen, 1884. 



1892. 

 Chonetina Krotow, 1888. 



Chonetella Krotow, 1884 (not 

 Waagen, 1884). 



