Ambo. 



22 



Amboccelia- 



fill fc4^^h^-i 



'il; \ ^# 





mg 



Unclerscribed species? Spec, 810-4, (0, p. 

 235), from south slope Hogback, Swanee road, Pike Co., from 

 lower beds of Upper Ilelderherg, VIII a. 



Ambonychia bellistriata, Hall. — Rogers, page 818, fig. 

 605. II, c. Trenton. See Hall. Pal. N. Y. 

 Vol. I. 1847, p. 163, pi. 36, figs 4, a. I, c. A 

 beautiful and easily reconized lamellibranch 

 shell, from the central part of the Trenton for- 

 mation at Middleville, Trenton Falls and else- 

 , where in N. Y., is mentioned by H. D. Rogers 

 ^^^ as found in Pa., but has not been reported dur- 

 the second survey, — // c. — Note. See Owen's (1852) 

 origin at figure, under Posidonomya hellistriata. 



Ambonycliia carinata. {Pterinea carhiata.) Emmons, 



page 402, fig. Ill, 1. Vanuxem, page 65, 

 fig. 91, 1. lie. Trejiton^ and Illh. loraine 

 sJiale. (See Goldfuss, 1826.) Always 

 abundant in the Loraine sliales of New 

 York; found from top to bottom of the for- 

 mation, to within four feet of the beds 

 holding Triarthus heckii; but rare in 

 the lower layers; bat never seen in the 

 Utica slate. Emmons. /// 5, the Sand- 

 stone shales of Pulaski. Vanuxem. 



Ambonycliia orbicularis. {Pterinea orhieularis.) Em- 

 mons, page 397, fig. 109, 3. Tren- 

 ton formation^ lie. This fossil 

 was found by Emmons at Water- 

 town, N, Y., in the black lime- 

 stone part of the Trenton forma- 

 tion (i. e. in the lower division of 

 ifT^fliV^' in some places, and in the 

 wSSifS upper division of it in other 

 1)1 aces) in company of Niiciilites 

 inUata.^ Nuculites faha and Sel- 

 ler opJion profundus; numerous, 

 but seldom perfect, as the shell 

 is thin and cannot be brought 

 away whole from the rock. — lie. 



