SCHUCHERT.] 



CLASSIFICATION OF NEOTREMATA. 



129 



3". Subfamily Diplosptrin^ Schucliert, 1894. 



Atbyvidn' (pavtim) Hall aiul Clarke, 1895. 



Atliyrida?, with the jugal bifurcations very long, lying' between the 

 volutions of the s])iralia, and continuing with these to tlieir outer ends. 

 Sometimes there is an additional Jugal process which articulates with 

 the ventral valve, or recurves and joins the jugum. 



Kayseria Davidson, 1882. 

 Diplospirella Bittner, 1800. 

 Euractinella Bittner, I8iK). 



Pexidella Bittner, 1890. 

 Anisactinella Bittner, 1890. 

 ? Didymospira Salomon. 



8^''. Subfamily Koninkinin^ Waagen, 1883. 



KoninckiuicLe Davidson, 1853; Ampbicliniiue Waagen, 1883; Diplospidic and 

 DiplospiridiP Mnnier-Chalmas, 1880. 



Athyrida' with jugum and spiralia essentially as in Diplospiridte. 

 The spiralia in Koninckiniuje, however, are not laterally directed as in 

 the former group, but point ventrally, this being due to the concave 

 form of the dorsal shell. 



Koniuckina Suess, 1853. 

 Amphiclina Laube, 1865. 

 Kouinckella M.-Chahnas, 1880. 



Koninckodonta Bittner, 1893. 

 "?Thecospira Zugmeyer, 1880. 

 ?Amphiclinodonta Bittner, 1890. 



3'"'. Subfamily Meristellin^ Waagen, 1883. 



Meristellida- Hall and Clarke, 1895. 



AthyridiC in which the jugal bifurcations do not enter the spiralia, 

 but recurve and join near their origin. 



Meristella Hall, 1860. 

 Charionella Billings, 1861. 

 tPentagonia Cozzens, 1846. 



Goniociidia Hall, 1861. 

 Dicamara Hall and Clarke, 1893. 



Merista Suess, 1851. 



Camarium Hall, 1859. 

 Dioristella Bittner, 1890. 

 'fCamarospira Hall and Clarke, 

 1893. 



Order NEOTREMATA Beecher, 1891. 



Circular or oval, more or less cone shaped, inarticulate Brachiopoda, 

 with the pedicle opening restricted throughout life to the ventral valve. 

 Pedicle aperture modified by a deltidium or listrium. Prodeltidium 

 attached to the ventral valve. 



Superfamily ACROTRETACEA Schuchert, I8O6.1 



Daikaulia (partim) Waagen, 1885; Diacaulia Hall and Clarke, 1895. 



Neotremata with phosphatic shells and a more or less well-developed 

 pseudodeltidium. Dorsal protegulum marginal. 



■ Text-book of Paleontology, by Zittel and Eastman, 1896, p. 308. 



Bull. 87 9 



