158 
The American Geologist. 
March, 1893 
Family KoMNCKiNiDyT:, Davidson 1853. 
Koninckinin;e and Amphiclinina', AVaagen 1883; Diplospidfe and 
Diplospiridse, Munier-Chalmas 1880. 
Koninckina. Suess 1853. 
Amphiclina, Laube 1865. 
Koninckella, M.-Chalmas 1880. 
? Thecospira. Zugraeyer 1880. 
? Amphiclinodonta, Bittner 
1890. 
Suborder ANCYLOBRACHIA,* Gray 1848 (Emend). 
Ancylopoda and Cryptobrachia (part), Gray ,1848 ; Kampylopegmata 
and Terebratulacea, Waagen 1883. 
Family Terebratulidje, Gray 18-10. 
Subfamily Centronellin.b, Waagen 1882. 
INIeganterinfe, Waagen 1882. 
Hallina, Winchell and Schuchert 
1892. 
Rensselaeria, Hall 1859. 
Newberria, Hall 1891. 
Eensselandia, Hall 1867. 
Meganteris, Suess 185G. 
Centronella, Billings 1859. 
Cryptonella, Hall 1863 (not 
1861, 1867.) 
Cryptonella, Hall (1861?) 1867. 
Juvavella, Bittner 1888. 
Nucleatula (Zugmayer) Bittner 
1890. 
? Notothyris, Waagen 1882. 
Subfamily Stringocephalin^, Dall 1870. 
Stringocephalida?, King 1850 ; Davidson 1853. 
Stringocephalus, Def ranee 1827. 
? Cryptocanthia, White and St. 
John 1868. 
Subfamily Terebratulin^, Dall 1870. 
Dielasma, King 1850. 
Epithyris, King 1850 (not 
Phillips 1841). 
Seminula, McCoy 1855 (not 
1844). 
Dielasmina, Waagen 1882. 
Terebratula, Llhwyd 1699. 
Sacculus, Llhwyd 1699. 
Lampas, Meuschen 1787. 
Glossothyris, Douville 1880. 
Pygope, Link 1830. 
Diphyites, Schroter 1799. 
Pugites, de Hann 1833. 
Antinomia, Catullo 1850. 
? Propygope, Bittner 1890. 
Liothyrina, (Ehlert 1887. 
Epithyris, Desl. 1862 (not King 
1848). 
*This subordpr is characterized b)' having a calcareous loop for tlie 6ui)port of the 
brachia. Some autliors have regarded tlie length of the loop as of subfamily importance, 
bnt this the writer does not consider as of ^reat value in classiticiition. The work of 
Friele, Deslongchanips, Davidson, Fischer and (Ehlert and others, lias shown that in 
certain forms the loop passes through various stages of growtli, or metamorphoses. In 
anotlier set of genera, the Terabratui.id.h, tlie loop does not pass tliroiigh any transi- 
tional stages. Upon this basis tlie genera have been arranged tentatively by Dr. Beecher 
and the writer. However, much yet remains to be worked out regarding the loop and 
the d,ental and septal plates in the fossil forms, liefore any permanent classification of 
the genera into families is possible. Geratology lias also iieen taken into account, as a 
number of genera have partially or entirely lost their brachial supports. 
