328 REVIEWS 



Article XII. Descriptions of species of Rudistoz from the Cretaceous 

 Rocks of Jamaica, W. I., Collected and Presented by Mr. F. C Nicholas. 

 By. R. P. Whitfield, pp. 185-196. Plates VI-XXII. 



This papers contains descriptions with excellent illustrations of ten 

 new species of these interesting fossils from Jamaica. Six species are 

 referred to the genus Radiolites, and four to Caprina. 



Article XX. Observations on the Genus Barrettia Woodward, with 

 Descriptions of New Species. By R. P. Whitfield, pp. 233-246. Plates 

 XXVII-XXXIII. 



The genus Barrettia was established by Woodward, upon some 

 peculiar cup-shaped fossils from the Cretaceous limestone of Jamaica, 

 W. I., and was referred by him to the Rudistce. Since the original 

 description several authors have expressed doubts as to the correct 

 reference of the genus to this group, and have questioned itsmolluscan 

 nature, considering it to be more probably a coral. 



Professor Whitfield's investigation of the genus is based upon a 

 collection of these fossils, some of them of large size, sent to the 

 museum by Mr. F. C. Nicholas. All of the characters, some of which 

 were not observed by Woodward, are carefully summed up and the 

 conclusion is reached that they are most probably corals. The paper 

 is concluded by the description of two new species. 



Article XXI. The Huerfano Lake Basin, Southern Colorado, and its 

 Wind River and Bridger Fauna. By H. F. Osborn, pp. 247-258. 



The presence of Eocene beds in the Huerfano River basin of 

 southern Colorado, was first made known, in 1888, by Professor R. C. 

 Hills, of Denver. Three papers, published between 1888 and 1891, 

 record the results of his observations upon the region. In the course 

 of his investigation, the Huerfano series was divided into three divi- 

 sions, beginning from the top as follows, (1) Huerfano beds 3300 

 feet, (2) Cuchara beds, 300 feet, and (3) Poison Canyon beds 3500 feet. 

 The Huerfano beds were correlated with the Bridger group or Middle 

 Eocene, on the basis if the vertebrate remains discovered, and the two 

 lower divisions were provisionally referred to the lower Eocene from 

 their stratigraphic position, no fossils being found. 



At a later date the region was visited by Professor Osborn and Dr. 

 Wortman, and the present paper records the results of their observations. 



