FOSSILS OF THE NIAGARA GROUP. 437 



LAMELLIBRANCHIATA. 



Ambonychia aoutirostra, Hall, = A. mytiloides, Hall. 



A. apiiea, Hall. 



Amphiooelia leidyi, Hall = ? Ambonychia neglecta, M'Chbsnky. 



Avicula emacerata, Conrad. Pal. N. Y., H, p. 282. 



A. undata, Hall. Pal. N. Y., II, p. 283. 

 Conocardium niagarensis, Winch. & Mak. 



C. ornatum. Winch. & Mar. 



Cypricardinia arata, Hall. 



Cypricardites .'' quadrilatera, Hall. 



Bdmondia nilesi. Winch. & Mar., = ': Modiolopsis nilesi. 



Modiolopsis dictseus, Hall. 



M. rectus, Hall, = Cleidophorus macchesneyanus. Winch. & Mar. 



M. subulatus, Hall. 



Palgeocardia cordiiformis. Hall. 



Pterinea brisa. Hall. 

 *P. cyrtodontoides, Winch. & Mar. 



*P. revoluta. Winch & Mar., = .' P. stritecosta, M'Chesnbt. 



P. volans. Winch. & Mar. 



G-ASTEROPODA. 



Bucania angustata. Hall. 



B. chicagoensis, M'Chesnet, New Pal. Fossils, p. 69. 1860. 

 B. crassolare, M'Chesney, New Pal. Fossils, p. 91. 1861. 

 B. pervoluta, M'Chesney", New Pal. Fossils, p. 91. 1861. 

 Cyclonema .' elevata. Hall. 



Eunema.' trilineata. Hall. 

 *Holopea chicagoensis, Winch. & Mar. 



H. guelphensis, Billings. 



H. harmonia.' Billings. 



*H. niagarensis. Winch. & Mak. 



Loxonema leda. Hall. 



Murchisonia conradi, Hall. 



M. liercyna.'' Billings. 



M. laphami. Hall. 



*Platyceras campanulatum, Winch. & Mar., ^ Platyostoma niagarensis, Hall. 

 *P. niagarensis. Hall, ^ jJcroculia niagarensis. Hall. Pal. N. Y., II, p. 288. 



Platyostoma niagarensis, Hall. Pal. N. Y., II, p. 287. 



Pleurotomaria axion. Hall. 



P. gonopleura. Winch. & Mar. 



P. halei. Hall. , 



P. halei. Winch. & Mar., = Trochonema (Cyclonema?) pauper, Hall. 



P. (Trochonema) hoyi. Hall. 



P. idia, Hall. 



*P. sigaretoides. Winch. & Mar. 



Porcellia senex, Winch. & Mar., = Platyceras. 



Straparollus mopsus. Hall. 



Subulites ventrioosus. Hall, = S. brevis, Winch. & Mar. 



Tremauotus alpheus, Hall, = Bdlerophon (^Bucania) perforatus, Winch. & Mar. 



Trochonema (Eunema) fatua. Hall. 



T. (Cyclonema ?) pauper, Hall. 



CEPHALOPODA. 

 Cyrtoceras brevicorne, Hall. 

 C. dardanus, Hall. 



C. fosteri. Hall. 



0. hercules (Winch. & Mar.) = Lituites hercules, Winch. & Mar. 



