ABSTRACTS OF PAPERS PRESENTED 111 



The evidence is held to prove beyond doubt not only that Camarocrinus is 

 the bulbous distal end of the stem of Scyphocrinus, but that it served as a 

 root for permanent or temporary fixation of the crinoid to the sea bottom, and 

 was not a float, as hitherto supposed by authors generally. The paper will 

 be published in the near future, with ample illustrations. 



The last paper of the morning session was presented without manu- 

 script and illustrated by charts ; 20 minutes. 



CORRELATION OF THE MIDDLE ORDOVICIAN FORMATIONS OF ONTARIO 



AND QUEBEC 



BY P. E. RAYMOND 



(Abstract) 



The Trenton of Ontario, with its large and varied fauna, differs markedly 

 from the Trenton of Quebec, which has a comparatively small fauna, made 

 up largely of cosmopolitan species. Further, the crinoid and cysfid faunas of 

 the west contrast strangely with the Cryptolithus fauna of the east. A study 

 of the principal exposures of the Trenton from Collingwood, on Lake Huron, 

 to Picton, on Lake Ontario, and Rockland, on the Ottawa River, shows that in 

 Ontario the Trenton can be divided on the basis of fossils into four principal 

 zones, one of which is younger than the strata at Trenton Falls, New York. A 

 study of the strata in the vicinity of Montreal and Quebec shows that the 

 sections there contain three faunal zones, two of which are older than the 

 strata at the typical locality. A comparison is also made with the sections in 

 Minnesota and Kentucky. 



The stratigraphic relations of the sub-Trenton strata in Ontario 'are next 

 discussed, in an attempt to show that the Pamelia, Lowville, and Black rivers 

 are parts of one group of post-Chazy age. 



At 12.15 the Society adjourned for luncheon, meeting again at 2 

 o'clock, with Vice-President Euedemann presiding. The papers upon 

 general and invertebrate paleontology and stratigraphy were then 

 continued and the following paper was read by title : 



THE ALEXANDRIAN SERIES IN MISSOURI AND ILLINOIS -BTBATJGRAPHl 

 AND PALEONTOLOGY. PAliT I 



BY T. E. SAVAGE 



(Abstract) 



The Alexandrian series comprises a number of early Silurian formations 

 that outcrop at intervals along both sides of the Mississippi River between 

 Cairo, Illinois, and Hannibal, Missouri, and appear also in Will and Kankakee 

 counties, in northeast Illinois. They occupy a position between the Richmond 

 below and the top of the Brassfleld limestone, and are separated from the 

 underlying and overlying rocks by a sedimentary hiatus. The Bequenee <>r the 

 several formations from below upward is: Girardeau limestone, Bdgewood 



limestone, Essex limestone, and Sexton Creek (Brassfleld) limestone. The 



