Ilesozoic and Ccunozoic Geology and Palmontology. 59 



alls, JST. subplana, N. cancellata, N. planimarginata, PectuncuUna 

 paj'vukt, now Limopsis parvitla, Cuculloea cordata,^ now Idonearca 

 Gordata, C. shumardi^ now I. shiimardi, Ilytihis attenuatus, now Vol- 

 sella attenuata, Inoceramv.s pertenuis, Pecten nebrascensis, JSTatica 

 subcrassa, now Lrinatia sitbcrassa, Natica tuomeyana^ now Vanikor- 

 oijsis tuooneyana, Panopaea occidentalism now Glycimeris occidentalis, 

 Maclra formosa, 31. loarrenana., 31. alta, Tellina subtortuosa, now 

 Thracia subtortuosa, Cytherea oivenana, now Callista owenana, 

 Hettangia americana, now Tancredia americana, Cardium speciosum, 

 and 3Iytilus subarcuatus. 



Professor L. Harper* described, from the bed of the Tuscaloosa, or 

 Black Warrior river, near Efie, Greene cofinty, Alabama, about twelve 

 miles above the confluence of the Tombigbee and Black Warrior rivers, 

 Ceratites americamis. 



Dr. Joseph Leidyf described, from the greensand of Burlington 

 county, New Jersey, Chelonia ornata, now Peritresius ornatus 

 Polygonodon vetus, Ischyrhiza mira, Edaphodon mirijicus, now 

 Ischyodus mirijicus : from Neuse river, North Carolina, Ischyrhiza 

 antiqua ; and from the Upper Missouri, Cladocyclus occidentalis and 

 Enchodus shumardi. And from the Fort Union Group, at Long Lake, 

 Nebraska, Emys obscurus, now Compsemys obscurus, Gompsemysv ictus, 

 and Jfylognathus prisons ; from the lowest liguitic of Grand river, 

 Nebraska, Thespesius occidentalis.^ and from the Bad Lands of Judith 

 River, Paloioscinciis costatus, Trachodon mirabilis, Troodonformosus, 

 Trionyx foveatus, Beinodon hoi-ridus, now Amblysodon horridus, 

 Crocodilus hicmilis, now Bottosaurus humilis, Lepidotus haydeni, L. 

 occidentalis, and Ischyrotherium antiquum, now Ischyrosaurus 

 antiquus. 



In 1857, Arthur Schott]; described the Cretaceous basin of the Rio 

 Bravo. The main portion, from Las Moras to the vicinity of Reynosa, 

 forms a belt of 380 to 400 miles in width. The upper part of this belt 

 commences in the vicinity of Las Moras, and terminates some few miles 

 above Laredo, a distance of about 200 miles, whilst the lower part be- 

 gins where the former ends, and reaches as far as the vicinity of Rey- 

 nosa, showing a width of about 340 miles. Both of these parts are 

 distinctly characterized by strata of greensand (chloritic chalk), which 

 change, according to the amount of oxide of iron they contain, into 



■' Proc. Acad. Nat. Sci., vol. 8. 

 t Proc. Acad. Nat. Sci., vol. 8. 

 t U. S. & Mex Bound. Sur., vol. 1. 



