658 



GEOLOGY 



Fig. 456. Pennsylvanian Marine Fauna: a, Eupachycrinus magister M. and 

 G., a crinoid with biserial arms; 6, Fusulina secalicus Say, a foraminilVr 

 shell that sometimes makes up considerable beds of limestone. <-/>, 

 brachiopoda: c, Productus nebrascensis Owen; d, Product ux mvfr////.s 

 Sow.; e, Seminula argentea (Shep.). a spire-bearing common Carbonif- 

 erous species; /, Lingula unbonata Cox, a representative of a genus 

 which persisted from the Cambrian to recent times; g, Hustcdin nior- 

 moni (Marc.); h, Spirifer cameraius Mort., a characteristic member 

 of the Pennsylvanian fauna; i, Productus symmetricus McCh.: /, D<r- 

 byia crassa (M. and H.); k, Enteletes hemiplicata (Hall); /, I'uijrni.r 

 uta (Marc.); m, Dielasma bovidens (Mort.); n, Meekella strialocoxttita 

 (Cox); o, Chonetes granulifera Owen; p, Spiriferina kentnckn UK in 

 (Shum.). q-t, pelecypods: q, Monopteria longispina Cox: r, Mlnn'snm 

 subcuniata M. and H.; s, Myalina recurvirostris M. and W.: /. .\ ri- 

 culopecten occidentalis Shum. u-x, gastropods: u, Worthenia t(il<l<i(<i 

 (Con.); v, Meekospira peracuta (M. and W.); w, Betterophon vercarina- 

 tus Con.; re, Naticopsis altonensis McCh. y, z, ami ::. cepnalopods: 

 y, Temnocheilus forbesianus (McCh.); z, Orthoceras crihrnxum (lein.; 

 zz, Paralegoceras newsomi Smith; xx, Phillipsia major Shum., almost 1 he- 

 last of the trilobites. 



