486 H. W. SHIMER PERMO-TRIASSIC OF XORTHAVESTERN ARIZONA 



Pelecypods 



Edmondia subtruncata Meek 



Nuciila perumbonata White 



Leda obesa (White) 



Parallelodon ? sp 



Pinna sp 



Acivulopinna peracuta Shumard. 



Bakewellia parva M . & H 



Pseudomonotis hawni M. & H.. . 



P. inequistriata Beede 



P. ? sp. 



Myalina ? sp 



Schizodus meekanus Girty 



5. sp 



Aviculopecten occidentalis (Shumard) . 



A . coloradoensis (Newberry) 



A. sp 



Entolium aviculatum Swallow 



Lima ? sp. a 



Lima ? sp. b 



Lima sp. c. 



Kaibab 



abcde fhn 



Pleurophoriis ? sp 



Astartella gurleyi White.. 

 Allorisma terminate Hall. 



A . gilberti White 



^. sp 



Mcenkopi 



Cf. 



i j k 1 



cf. 



Scaphopods 



Plagioglypta canna White 



I I ici I I I I I IclClCjCI 



Gastropods 



Pleurotomaria grayvillensis N. & P. 



P. sp 



Murchisonia ? ierebra White 



Euphemus carbonarius (Cox) 



Patellostium nodocostatum (Gurley) 



P. ourayense (Gurley) 



Warthia americana Girty 



ir. sp 



Strophostylus nanus (M. & W.) 



5. sp 



Turritella ? sp. (small) 



cf, 



Trilobites 



Phillipsia so. 



I I I I I I I Irf I I I I I 



N'oTES OX Species 



The species from the Kaibab limestone are in the majorit}' of cases 

 apparently identical with similar species from the Upper Pennsylvanian 

 and Permian of the Mississippi Valley and farther west. In the Moen- 

 kopi, on the other hand, there is a persistent difference, minute in some 



