. APPENDIX. 



The following pages include a number of species which 

 have been added to our fauna since the foregoing pages were 

 put in print. Several of these are old species recorded for the 

 first time within the limits of the area, while others are new 

 species recently discovered. Several additions and corrections 

 are also made to the introductory and other portions of Part I. 

 The writer is indebted to the following persons for addi- 

 tional information: Dr. W. H. Dall, United States National 

 Museum, Washington, D. C.; Mr. George H. Clapp, Pittsburg, 

 Pa.; Mr. Bryant Walker, Detroit, Mich.; Mr. Edward W. Roper, 

 San Diego, Cal. (now deceased). 



p. ii. Lower part of page. The last sentence should be 

 changed so as to read: "In all groups except the Pelecypoda 

 the mouth is provided with a manducatory apparatus (odonto- 

 phore, radula or tooth-bearer"). 



p. 12. The sentence stating that "the subkingdom is of 

 quite recent date geologically" should be changed to read, "is 

 geologically of very ancient date," as the Mollusca are known 

 as far back as the Cambrian. 



p. 1 6. Planorbis bicarinatus has been found in the North 

 Branch of the Chicago River by Mr. Jensen, thus bringing it 

 in the northern region. 



p. 1 8. Lampsilis parvtis has been found in the North Branch 

 of the Chicago River and in the Little Calumet River, and 

 hence belongs to the three regions of the area. Calyculina 

 tramversa has also been found at Edgebrook and at Blue Island, 

 and belongs with the universally distributed species. Alasmo- 

 donta rugosa has been found in the North Branch of the Chicago 

 River, and should be placed among the species common to all 

 regions. The following species are to be added to the univer- 

 sally distributed species: 



Alasmodonta deltoidea. North Branch Chicago River and 

 Edgewater. 



Polygyra monodon. Wolf Lake. 



Polygyra leaii. Evanston, Bowmanville, Edgebrook, etc. 



Bifidaria armifera. Edgebrook. 



Circinaria concava. Wolf Lake, Hammond, Roby, etc. 



