473 



NUCULA. 



HcilL\J 



Xltl. 



Nucula varicosa, Hall, Prelim. Notice Lamellibranches, 



1870, Hamilton, Pal. N. Y. 

 Vol. V i, plate 46, fig. 14, 



vm'c. 



natural size^ right valve ; 

 fig. 15, enlarged, Claypole's 

 specimens 80-17, of White's 

 collections, from Blooms- 

 burg, Oolumb. Co. Pa. from 

 "^^ " Catslcill strata. IX, 

 Nucula ventricosa. (Hall, 1858, Geol. of Iowa, part II, 



p. 716, pi. 29, figs. 4, 5 = ? Nucula tumida^ 

 .5 /^.^ Phillips.) Collett's Indiana Eeport of 1881, 

 1^ page 371, plate 42, figs. 9, 10. Report of 

 '^iW^l 1883, page 146, plate 27, figs. 9, 10, ordi- 

 nary size of the specimens found, left side 

 view, and back or hinge view. Surface usually- 

 smooth, but concentric striae generally observ- 

 able toward the basal margin. Hall. Generally 

 found at roof of Coal M, Ind. In Ferriferous 

 limestone^ Low. Prod. C. M. Beaver, Lawrence, 

 Mercer, Butler Cos., Pa. Q, 62, 200; Q2, 47, 106 ; 

 Q3, 25; y, 147. In Decker'^s creek limestone,, under Mahoning 

 SS. L, 36. In Crinoidal limestone^ 250' beneath Pittsburgh 

 coal. Q, 30; L, Z^,—XIII, XIY, 



Nucula . Rogers, Geology of Pennsylvania, 1858, 



XlU i sf i m, P^S® 8^^? fig- ^^- Coal measures. XIII, 



\\\\ 



i)/a.f8apur 



Nucula 



? A small species in the 



Portage beds of Blair county. T, p. 30. — VIII f, 



Nucula ? In bed No. 45 of the Olive shales on the 



Pa. R. R., below Huntingdon. T3, p. 264.— FZ/7^. 



Nucula ? Abundant in Chemung beds, 50' to 100' 



above the Stony Brook group. G7, p. 73 ; in bed 41 of Section 

 63, G7, p. 197. Two neiv species in beds 5, 7 and 9, of the sec- 

 tion at Bloomsburg, Columbia Co., Pa. G7, p. 290. — VIII g, 



Nucula ? Seen in the lowest layer of the Oreat 



Limestone on the Chartiers Valley railroad at Cannonsburg^ 

 Washington Co., Pa. K3. p. 307 and 310.— XF] 



