42 Transactions of the Kansas 



1128. Zygadenus leimanthddes Gr. Ark. City. 



1129. Juncus Balticas Dethard, va): Ellin. 



1130. Cyperus stowlepis Torr. Sal. 



1131. Cypein(s £)igelmanni Stend. Law. 



1132. Cyperus Lancastriensis Porter. Law. 



1133. Eleocharis obtuf<a Schultes. Law. 



1134. Selena triglomernta'Kx. Law., Leav. 



1135. Car ex aristala R. Br. Ellin. 



1136. Carex Doughisii Boott. Ellin. 



1137. Cdi'ex angustata B. strictior Dewey. Ellin. 



1138. Aiistida purpurascetis Po'n: Sal. 



1139. Calnmagrostis longifoUa Hook. Ellin. 



1140. Pdnicum [^l^aspainm f} glabrum Q-Axn\. Topeka ; Popt-noe. 



1141. Panictnn villosum 'EU. Sal. 



1142. Paniciim dichotomwn var. sphcerocarp nm Law. var. barbulatum Law. 



1143. TriGuspis ambigua Ell. Topeka ; Popenoe. 



1144. Festuca om?ia L. var. brevifolia, possibly dutiuseula fls. 9. Ark. City. 



1145. Eatoiiia Peiinaylvanica D C. Law., Ark. City. 



1146. Poa serotina Ehrh. Ellin. 



1147. Glycerin Canadensis Trin. Law., Ellin. 



1148. Equisetum Umigatnm Braun. Sal. 



AMERICAN JURASSIC DINOSAURS. 



By S. W. WiLLisTON, New Haven, Conn. 



The recent discoveries of abundant Dinosaur remains in the Rocky Mountain 

 region, has given a renewed interest to the study of this singular order of extinct 

 reptiles. Since the discovery, in March, 1877, of fragments of these animals in the 

 upper Jurassic beds of Colorado and Wyoming, there have been exhumed not less 

 than thirty tons of their remains, an amount probably exceeding all hitherto 

 brought to light, both in Europe and America. The larger proi)ortion of these 

 collections are now in the museum of Yale College, and the remainder in Phila- 

 delphia, where, from their future study by the indefatigable paleontologists, Marsh 

 and Cope, the final solution of their structure and affinilies may be confidently 

 expected. 



The history of their discovery is both interesting and remarkable. For years 

 the beds containing them had been thoroughly studied by geologists of experience, 

 under the surveys of Hayden and King, and their position and extent carefully 

 described and mapped out, but yet, with the possible exception of the half of a 

 caudal vertebra, obtained by Hayden, and described by Leidy as a species of 

 Poikelopleuron, not n single fragment had been recognized! This is all the more 

 remarkable from the fact that in several of the localities, thus mapped out. 1 have ob- 

 served acres, literally strewn with fragments of bone, many of them extremely char- 

 acteristic, and so large and conspicuous as to have taxed the strength of a strong 

 man to lift them! Three of the localities known to me are in the immediate 



