20 Cincinnati Society of Natural History. 



thickness of 100 feet. It is iisuall}^ soft and friable, and liable to dis- 

 integrate rapidl}- when exposed to the action of the weather. At Fort 

 Washita he found Ammonites several feet in diameter, and weighing 

 between 400 and 500 pounds. 



Dr. B. F. Shumard described Ostrea subovata, Astarte Washitensis, 

 Cardium multistriatum, now Protocardia multistriata^ Panopoea tex- 

 ana, Terebratula choctawensis, Glohiconcha elevata, G. tumtda, 

 Eulima suhfusiformis., Ammonites acuticarinatus, A. marcianus, He- 

 miaster elegans.^ now Toxaster elegans^ and Uol aster simplex. 



Dr. Leidy* described, from near Greenville, Clark count}-, Arkansas, 

 Brimosaurus grandis, now CimoUasaurus grandis. And Evans & Shu- 

 mard described, from Sage creek, Nebraska, Avicula linguiformis, A. 

 triangularis, Solarium Jfexistriatum, now Jlargaritella Jfexistriata, 

 Pholadomya elegantula^ and Bostellaria nehrascensis, now Anchura 

 nthrascensis ; and from Fox Hills, 3Iytilus galpinanus now Volsella 

 galpinana. 



In 1855, M. Tuome3't described, from Alabama and Mississippi, 

 Nautilus orbiculatus, N. spillmani, N. angulatus, Ammonites angus- 

 tns, A. binodosus, A. carinatus, A. magnijicus, A. ramosissimus^ Tur- 

 rilitea aJfernatus, Turritella fastigiata Phorus umbilicatus, now En- 

 doptygma umbilicata, Voluta cancellata, V. fitsiformis, V. jugosa, 

 V. spillmani, Fusus eufalensis, F. turriculus, Pyrula richardsoni, 

 now Pyropsis richardsoni., P. trochiformis, now Pyropsis trochiformis, 

 Cerithium nodosum, Teredo calamus, Panopcea cretacea, Pholadomya 

 tenua, Cai diuni hemicyclus, Cucullwa ungula, Inoceramus biformis, 

 I. inflatus, I. proximus, I. salebrosus, I. triangidaris, Radiolites or- 

 mondi, P. aimesi, R. undidatus, Ichthiosarcolites cornutus, I. lorica- 

 tus, I. quadrangular is. 



T. A, Conrad]; described, from Dallas count}', Miss., Baculites an- 

 nulatus, Ha mites larvatus, H. rotundatus; from Arkansas, ^Tzcz/Zocera.v 

 approximans, and Cardium arkansasense, now Protocardia arkansas- 

 ensis; from Alabama, Caprina quadrata, and from Texas, Bostellites 

 texanus, Turritella irrorata, Caprina occideiifalis, C. planata, JS eithea 

 occidentalis, Mactra texana, Exogyra jimbriata^ and E. fragosa. 



Dr. Joseph Leidy§ described, from the greensand near Pemberton, 

 New Jersey, Pristis curvidens. 



■' Proc. Acad. Nat. Sci., vol. 7. 

 t Proc. Acad. Nat. Sci., vol. 7. 

 X Proc. Acad. Nat. Sci., vol. 7. 

 g Proc. Acad. Nat. Sci., vol. 7. 



