SCHUCHEET. 



CLASSIFICATION OF NEOTREMATA. 



129 



3". Subfamily Diplosptrin^ Schuchert, 1894. 



AthyridfB (partim) Hall and Clarke, 1895. 



Atbyridiie with the jugal bifurcations very long, lying between the 

 volutions of the spiralia, and continuing with these to their 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, 1890. 

 Euractinella Bittner, 1890. 



Pesidella Bittner, 1890. 

 Anisactinella Bittner, 1890. 

 ? Didymospira Salomon. 



3^^ Subfamily Koninkinin^ Waagen, 1883. 



Koninckinidae Davidson, 1853; Amphicliuinie Waagen, 1883; Diplospidse and 

 Diplospirid* Miinier-Chalmas, 1880. 



Athyridie with jugum and spiralia essentially as in Diplospiridai. 

 The spiralia in Koninckinina3, however, are not laterally directed as in 

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

 form of the dorsal shell. 



Koninckina Suess, 1853. 

 Amphiclina Laube, 18G5. 

 Koninckella M.-Chalmas, 1880. 



Koniuckodonta Bittner, 1893. 

 ^Thecospira Zugmeyer, 1880. 

 ?Amphiclinodonta Bittner, 1890. 



3^^ Subfamily Mertstellin^ Waagen, 1883. 



Meristellidie Hall and Clarke, 1895. 



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

 but recurve and join near their origin. 



Meristella Hall, 1860. 

 Charionella Billings, 1861. 

 fPentagonia Cozzens, 1846. 



Gonioccelia Hall, 1861. 

 Dicamara Hall and Clarke, 1893. 



Merista Suess, 1851. 



Caniarium Hall, 1859. 

 Dioristella Bittner, 1890. 

 ?Oamarospira Hall and Clarke, 

 1893. 



Order NEOTREMATA Beecher, 1891. 



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

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

 Pedicle aperture modified by a deltidium or listrium. Prodeltidium 

 attached to the ventral valve. 



Superfamily ACROTRETACEA Schuchert, 1890.i 



Daikaiilia (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 



