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was occupied by a lake which has left terraces about the valley. These 

 are finely preserved on the slope west of the north end of the valley. 

 Economic geology. — As economic features there are represented 

 on the map numerous lenses of limestone, which is often highly mag- 

 nesian. Gold quartz veins are indicated by orange dashes. The 

 auriferous gravels are noted, and also deposits of chrome iron and of 

 magnetite. 



Bulletin of the America?:. Museum of Natural History. Vol. IX, 



1897- 

 This volume contains twenty-four separate articles contributed by 

 members of the museum staff. Those from the departments of verte- 

 brate and invertebrate palaeontology will be briefly noticed. 



Article IV. Note on the Hypostome of Lie has (Terataspis) grandis 

 Hall. By R. P. Whitfield, pp. 45-46. 



Lichas {Terataspis) grandis, is one of the largest and most highly 

 ornamented trilobites of the Devoinan faunas. As yet it has never 

 been found preserved except as fragments, and previous to the present 

 paper no hypostome of the species has been described. This note by 

 Professor Whitfield describes, with illustrations, two large hypostomes 

 supposed by him to belong to this species. They are from loose 

 bowlders of Schoharie grit obtained in northern New Jersey and are 

 associated with other fragments of the same trilobite and with other 

 species of the same horizon. 



Article VI. The Ganodonta and their relationship to the Edentata. 

 By J. L. Wortman, pp. 59-110. 



The relationship of the Edentate mammals has long puzzled zoolo- 

 gists, and previous to the establishment of the suborder Ganodonta by 

 Dr. Wortman, no palaeontologist has more than suggested what this 

 relationship might be. Although the genera composing the group 

 have long been known, yet the materials, up to the present time, have 

 been so imperfect and fragmentary as to preclude any very exact knowl- 

 edge of their affinities, and they have been placed by different authors 

 at different times with the Tillodontia, the Tceniodonta, and the Creo- 

 donta. By the aid of the discovery of a fore limb of one of the species, 

 Pisittacotherium multifragum, in association with the lower jaw and 



