51 



Carboniferous Cephalopods. Second Paper, by same. 4th Ann. 

 Rep. Geol. Surv. Texas, pp. 379-474 with 55 figures. 



Phylogeny of an Acquired Characteristic. B} T same. Am. Nat., 

 October, 1893, pp. 865-867, with one plate. 



Phylogeny of an Acquired Characteristic. By same. Proc. Am. 

 Phil. Soc, Philadelphia, Vol. XXII. , No. 143, pp. 349-647, with 14 

 Plates. 







