142 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



correctness of these accounts, and it was thereupon voted b}' the Society 

 that the report be accepted. 



PRESENTATION- OF PAPERS 



Tlie first paper of the morning was an interesting account of the Cre- 

 taceous strata of northwest Europe as interpreted from the fossil sponges. 

 This was presented by the author and illustrated with a number of dia- 

 grams. It brought forth considerable discussion, in which Messrs. Eeeds, 

 Grabau, Merriam, Dickerson, and Holland took part, with replies by 

 Miss O'Connell. 



CRETACEOUS OVERLAPS IN NORTHWEST EUROPE AND THEIR .BEARING ON 

 THE BATHYMETRIC DISTRIBUTION OF THE CRETACEOUS SILICISPONGIJE 



BY MARJORIE O'CONNELL 



{Al)stract) 



While studying and arranging a collection of over a thousand specimens of 

 Cretaceous Silicispongise in the American Museum of Natural History, the 

 author was led to consider the lithic character and areal distribution of the 

 sediments in which these fossils were found and the problem of the bathymetric 

 range of European Cretaceous Silicispongise. The bathymetric ranges of Cre- 

 taceous species which have persisted to the present time will be given and there 

 will be a brief discussion of the conclusions which it is permissible to draw 

 from such data. The significance of the overlaps of the sponge-bearing and 

 other Cretaceous strata of Europe will be considered and the value of the 

 lithogenetic method of study in the determination of habits of ancient organ- 

 isms will be dwelt on. 



The next paper, which was ampl}' illustrated by very clear and inter- 

 esting lantern slides, w^as of especial interest on account of dealing with 

 the region considered in the symposium. It was presented by the author, 

 vvrho replied to discussions by Messrs. Burling and Matthew. 



NEW BATHYMETRICAL MAP OF THE WEST INDIES REGION 

 BY CHESTER A. REEDS 



(Abstract) 



During 1916 all of the Hydrographic and Coast and Geodetic Survey charts 

 bearing on the West Indian region were assembled and, with chart 1290 as a 

 base, all soundings were plotted. The one-hundredth fathom line was then 

 drawn, also the five hundredth, and with a contour interval of 500 fathoms 

 successive depths were sketched down to 4,500 fathoms. The result is a con- 

 tour map somewhat different from its predecessors. When modeled on a globe 

 surface the features of the submarine topography are even more striking. 



