214 PALEONTOLOGY OF NEW YORK. 



tionopen to question. No observed rhynchonellid has a septum or evinces any 

 tendency to the formation of a spondylium in the pedicle-valve, as in Camaro- 

 PHORiA. Camarophoria is a genus combining a modified pentameroid interior 

 with a rhynchonelloid exterior. The genus appeared in the early Devonian, 

 when the prevalence of the pentameroids was past, and species of Camarotce- 

 chia were on the increase. Its earliest representative in American palaeozoic 

 faunas seems to be a shell which occurs in the Corniferous limestone of Cass 

 county, Indiana, and which is hardly distinguishable from the middle Devonian 

 forms referred to the Terebratula rhomboidea, Phillips.* This American shell, 

 the occurrence of which has not before been noted, corresponds with the Devo- 

 nian shells figured by Davidson, though nearly all the specimens give some 

 evidence of lateral plications about the margins. No opinion will be here 

 expressed as to the specific identity of these Devonian, Carboniferous and Per- 

 mian shells, except to distinguish by the name, Camarophoria rhomboidalis, the 

 American Devonian species, from the Carboniferous shells described by Phillips 

 as Terebratula rhomboidea. Representatives of the genus are never abundant in 

 American faunas, and the species mentioned appears to be its only known 

 example in the Devonian, f 



In the early Carboniferous faunas are a few well-defined species : C. ringens, 

 Swallow, from the chert beds of the Burlington limestone ; C subtrigona, Meek 

 and Worthen, from the Keokuk group; C. Wortheni, Hall, and Rhynchonella sub- 

 cuneata, Hall, from the St. Louis formation. 



The species C. Giffordi, Worthen, has been described from the Coal Measures, 

 and C. bisulcata and C. Swallovana, Shumard, from beds considered to be of 

 Permian age. J 



* Phillips' species was based upon specimens from the Carboniferous limestone of Holland (Geologfy of 

 Yorkshire, p. 222, pi. xii, figs. 18-20. 1836). Later, in his Palaeozoic Fossils of Cornwall (p. 88, pi. xxxv, 

 fig. 158. 1841), he i-eferred the Devonian shell to the same species, and is followed by Davidson and other 

 authors in ascribing to this species a range from the Devonian into the Permian, where it passes under the 

 name of C gldbullna, Phillips (see Davidson, Carboniferous Brachiopoda, p. 115 ; Devonian Brachiopoda, 

 p. 70; Kayser, Zeitschr. der Deutsch. geolog. Gesellsch., vol. xxiii, p. 529). 



t The shell described in Volume IV of the Palaeontology of New York (p. 368) as Camarophoria Eucharis, 

 Hall, from the Corniferous limestone, is spirigerous, and has been taken as the type of the proposed genus 

 Camarospira. 



I The Camarophoria glohulina, (Phillips) Davidson, and C. Dawsoniana, Davidson, from the upper Car- 

 boniferous of Windsor, Nova Scotia, are not Camarophoriaa but rhynchonellids, similar toij. Vta, Marcou. 



