Modi. 



408 



Modiolopsis faba. {Nuculitesfaba). Emmons, page 395, 



|»> „rr. fig. 106, 5. // G. Trenton (Conrad, 1842, in 



Emmons, II c^ Blackriver and Trenton^ Illh^ 

 Loraine formations. See specimens 205-1, and 

 E'I06. 5". 205-2 (twenty of them) in 0. E. HalPs collec- 

 tions near Reedsville, Mifflin Co., Fa., (00, p. 232,) in strata 

 probably lower than Trenton ; also 207-1 (twenty) and 207-2, 

 in F. Piatt's collections in Morrison's Co., Blair Co., in 

 Chazy strata.^ II J. 



Modiolopsis gesneri, Billings. Geol. Can. 1863, p. 172, 



Geo/. C<3n. /863 



fig. 157 a^ side view; 5, dorsal view. Trenton group. II c. 



Modiolopsis maia, Billings. Geology of Canada, 1863, 

 80 6 a 81 hr, P^go 143, fig. 80^, right valve ; 



5, dorsal view. (Fig. 81 is 

 M, nais^ Billings. See be- 

 low on page 420.) — Trenton 

 group. II G. 



Geo/. C<3n 



/R63 



Modiolopsis meyeri, Billings. First named and described 



lie. ^.<:^^^^^-^ /S8 in Pal. Foss. Canada, Vol. 1, 



1862. Figure here given is 

 taken from Geology of Canada, 



1863, page 173, figure 158, from 

 the Trenton group in Canada. 



___^__ IIg. 



Modiolopsis modioliformis, Meek and Worthen. Geol. 

 Survey of Illinois, Vol. 3, 1868. Trenton., II c. 



