737 



Posi. 



Porites P 



Hall 



Hall's Geology of Western New York, 1843, page 



S6, fig. 2 5, 

 shell mostly 

 removed 

 leaving only 

 the lines of 

 growth. JVia- 

 gara lime' 

 stone, Vi- 



z\ne\ 



Poroblattina arcuata, Scudder. A cockroach from Trias. 



Poroblattina lakesii, Scudder. A cockroach from the 



Trias^ near Fairplay, Colorado. Proceed- 

 ings of the Academy of Natural Sciences^ 

 Phila., 1885, p. 39. Fig. 936, {magniAed 

 three times) in Zittel's handbuch. — Trias, 



936 



Posidonias, little ostracoid lamellibranch shells, lived in 

 incredibly great numbers in the Upper Coal measure and Upper 

 Barren measure ages. See Stevenson's references to their 

 abundance (with fish teeth and scales in thereof shales of both 

 the Lower and Upper Washington coals,, and other higher strata 

 of S. W. Pennsylvania (K 3, p. 306.) Dr. Isaac Lea of Phila- 

 delphia, in 1853, Jour. Acad. Nat. Sci. [2] Vol. 2, described 

 three species P, clathrata, P. distans^ P, perstriata; and Mr. 

 Gabb, in 1859, Proc. Acad. N. S., Phila., a fourth P, moorei^ 

 all from the Pennsylvania coal measures. XF, XVL 



Posidonia ? alata. Hall. Geology of Western New York, 

 V' .^^^!^»K^ 1^43, page 72, fig. 17, 7. Clinton form, Va, 



Posidonia alveata^ now Grammysia. 



Posidonia arcuata^ now Grammysia. 



Posidonia lirata, now Paracyclas. 



