SCHUrHERT 



CLASSIFICATION OP PUOTKEMATA. 



135 



Clitaiiibonites Pander, 1830. 

 I'roiiites Pander, 1830. 

 Gouambonites Pander, 1830. 

 Orthisina d'Orbiguy, 1847. 



I'olytoechia Hall and Clarke, 1892, 

 Heuiiprouites Pander, 1830. 

 Sceuidium Hall, 1860. 



Mystrophora Kayser, 1871. 



2. Family SYNTKOPHIID^ Schncbert, 1896.i 

 StricklandiniidiH (partim) Hall and Clarke, 189.5. 



Primitive Peutameracea with long, straight cardinal areas, deltidia, 

 and cruralia. 



Syntrophia Hall and Clarke, 1892-93. 



2a. Family POPAMBONITID.E Davidson, 1853.' 



Porambonitin;!' Gill, 1871; PorainbonitidiB (partim) Ncetling, 1883; Camarellid;e 



(partim) Hall and Clarke, 1895. 



Peutameracea intermediate in structure between the Syntrophiidie 

 and Pentamerida>, in that the deltidium and the straight cardinal 

 areas of the former family tend to obsolescence, particularly the del- 

 tidium. The Porambonitidic approach the latter family in tending to 

 develop a rostrate shell. Cruralium present. 



Branconia Gagel, 1890. 

 Porambonites Pander, 1830. 



Priarabonites Agassiz, 1847. 



Isorhynchus King, 18r)0. 

 NijBtlingia Hall and Clarke, 1893, 

 °?Lycophoria Lahusen, 1885, 



Camarella Billings, 1859 (emend 



Hall and Clarke, 1893), 

 Piirastroi)hia Hall and Clarke, 



1893. 

 Anastropliia Hall, 1807. 



Brachymerus Shaler, 1865 (not De- 

 jean, 1834). 



2b. Family PENTAMEKID.E McCoy, 1844. 



Hypothyridie (partim) King, 1850; Pentamerid;^ Hall, 1867; Cameioplioriinie 

 Waageu, 1883; I'entamerina' Gill, 1871; Waagen, 1883; Porambonitida' (partim) 

 Noetling, 1883; Stcnochismatinic and Conchidiinfe ffihlert, 1887; Camarellidie 

 (partim), Stricklandiniidw (partim), and Ampliigenidt-e Hall and Clarke, 1895. 



Rostrate Peutameracea rarely with straight cardinal areas. Del- 

 tidium commonly absent, but sometimes present as a concave ])late, 

 being the reverse of the ordinary form of the deltidium and due to the 

 incurved beaks. Cruralium present. 



iStricklandinia Billings, 1863. 



Stricklandia Billings, 1859. 

 Pen tamer US Sowerby, J 813. 



I'entastcro Bhuuville, 1824. 

 Capellinia Hall and Clarke, 1893. 

 Pentamerella Hall, 1867. 

 Gypidula Hall, 1867. 



Sieberella (Ehlert, 1887. 

 Camarophorella Hall and Clarke, 



1893. 

 Amphigenia Hall, 1867. 



Conchidium Linne, 1753. 



Antirhynchonclla Qiienstedt, 1871. 



Zdimir Itarrnndr, 1879. 



Gypidia Dalman, ISL'8. 

 Clorinda Barrande, 1879. 



Barrandella Hall and Clarke, 1893. 

 Euantiosphen Widborne (Holzap- 



fel), 1893. 

 Camarophoria King, 1846. 



StenocbismaDall, 1877; (Eblert, 1887 

 (not Conrad, 1839). 



I Text book of Paleontology, by Zittel and Eastman, 1896, p. 320. 



-Siuce Hall and Clarke's family Caniarellida) (1895), after removing Camarophoria and Caraaro- 

 pliorella, is based upon the same family characters as those of the Porambonitidie (1853), as Poram- 

 bonites 18 now interpreted, Davidson's family is retained on the ground of priority. 



