608 abstracts: zoology 



of the order of events that cuhiiinated in the occupancy of the inte- 

 rior of North America by sea waters in Cretaceous time. It is a 

 non-marine forerunner of the Cretaceous marine formations and is of 

 Cretaceous age. W. T. L. 



GEOLOGY. — Eocene glacial deposits in southwestern Colorado. W. W. 



At WOOD. U. S. Geological Survey Professional Paper 95-B. 



Pp. 13-26. 1915. 

 At the northwest base of the San Juan Mountains, not far from the 

 village of Ridgway, Colorado, there is a series of exposures that include 

 a remarkable section of glacial till, which is overlain by formations of 

 Early Tertiary age. At the type locality, where first discovered, the 

 till consists of 80 to 100 feet of material showing all the characters of 

 glacial till, including an abundance of striated pebbles. This is capped 

 by finer material probably also of glacial origin and this in turn by the 

 Telluride conglomerate and the San Juan volcanic tuff, well known to 

 be of Tertiary age. From the facts thus far discovered it is inferred 

 that glaciers of the alpine and possibly also of the piedmont or small 

 ice-sheet types existed in Eocene times in and adjacent to an early 

 generation of San Juan Mountains. E. S. B. 



ZOOLOGY. — DieCrinoidender Antarktis. AustinH. Clark. Deutsche 

 Sudpolar Expedition, XVI, Zoologie, 8: 103-209, pi. 1-10. May 

 16, 1915. 



This is a complete monograph of the antarctic crinoids, including an 

 historical introduction, systematic discussion, and philosophical con- 

 clusions. Full synonymies of the families and genera, as well as of 

 the species, are given, and diagnoses of the species, genera, and higher 

 groups. The families Bourgueticrinidae and Plicatocrinidae and the 

 subfamilies Zenometrinae and Heliometrinae are revised. The origin 

 and relationship of the antarctic fauna is discussed, and the arctic 

 and antarctic faunas are contrasted. The significance of the distri- 

 bution of antarctic types in its' relation to the problem of the circulation 

 of the abyssal water is considered in detail. 



One new genus, Eumorphometra, two new subgenera, Anthometra 

 and Florometra, and three new species, Psathyrometra antarctica, 

 Eumorphontetra concinna and Ormina occidentalis, are described. 



In the included note by J. Thiele is given a description of Eulima 

 capensis, sp. nov., a parasitic gastropod found on Cominia occidentalis; 

 and in a note appended, by F. W. Clarke, are given analyses of the 

 skeletons of Promacliocrinus kerguclensis and Anthometra adriani. 



A. H. C. 



