Leio. 



306 



yiif.v 



villi 



Leiorhynchus ? hecate, Clarke. Bull. 16, U. S. G. S. 1885, 

 •Yiiie. ^^fc, ^''■- page 31, plate 3, fig. 14, magniHed 10 times j 



the most abundant fossil in the Genesee black 

 shale of Ontario Co,, N. Y. Five rounded 

 folds on each side of the middle groove of the 

 ventral valve ; disappearing towards the beak ; 

 surface not sculptured. — VIII e, 

 Lieiorliynchus limitaris. ( Atri/pa UmitariSy Hall ; Orthis 



limitaris^ Vanuxem ) Hall, page 

 180, fig. 71, 11. Vanuxem, page 

 146, fig. 35, 2. Rogers, page 826, 

 fig. 652. Marcellus formation. 

 (Supposed to characterize this 

 formation by being found in no 

 other in New York.) — In Perry 

 Co. Pa. Claypole collected it from 

 Smith's quarry, Sandy Hollow, 

 Marcellus limestone^ &c. (Spec. 

 48-1.) — At the Huntingdon car 

 works also (T3, 115) ; at McCon- 

 nellstown in vast numbers (Specs. 

 188-1, 2, 191-2); at 203rd mile 

 post RR (T3, 113) ; especially abundant 10' below top of Mar- 

 cellus black shale. No. 8 of McConnellstown section (T3, 198) ; 

 the most abundant of the many shells which crowd the upper 

 250' of Marcellus in West Huntingdon (T3, 258) ; abundant in 

 upper beds of Marcellus along Murray's run, east Oneida t. 

 Also in Marcellus (with Styliola Ussurella) at Selinsgrove, 

 Northumberland Co. (G7, p. 79.) VIII 5. — But it is found also 

 in the Hamilton lower shales on 005*60 run, RR. quarry. Hunt. 

 Co. (T3, 112; and Claypole's spec. 190-2)— FZ/7&, c. 

 Leiorhynchus mesacostalis. [Atrypa mesaGOstalis.)Ilsi\]^ 



G.4thD. 

 [67,1, a, 

 b.] Che- 

 m u ng 



* ^"mmm.'a^^smm^ forma- 



1 1 on . 

 (Casts common everywhere.) — Claypole's 

 Perry Co. Pa. specimens are 27-6, 7 (eight) 

 from W. of Newport, Chemung- Catskill 



V.X. Sl3. 



---V. 





wm 



