THE NAUTILUS. 



Vol.. X. MARCH, 1897. No. 11 



ILLUSTRATIONS OF NEW UNIONIDJE. 



Plate I, figs. 1. 2, 5, Unio superiorensis Marsh. For description 

 see NAUTILUS for January, 1897, p. 103. 



Figs. 3, 4, Unio Askewi Marsh. Description in NAUTILUS for 

 December 1896, p. 91. 



Figures are natural size. The specimens illustrated have been 

 placed by Mr. Marsh in the Museum of the Academy of Natural 

 Sciences of Philadelphia. 



LIST OF SPECIES COLLECTED AT BAHIA. BRAZIL, BY DR. H. VON 



IHERING. 



IDENTIFIED BY W. H. DALL. 



The following species of shells were collected under the direction 

 of Dr. H. von Ihering at Bahia, except when otherwise stated, and 

 were forwarded to the National Museum for identification. This 

 list includes only the doubtful species which could not be named 

 with the literature available at the San Paulo Museum. Dr. von 

 Ihering will eventually publish a complete list of the Brazilian coast 

 fauna; meanwhile these identifications may be useful for reference. 

 The remarkable thing about the collection, made 500 miles south of 

 Cape San Roque and 2,200 miles beyond the mouth of the Amazon, 

 is its typically Autillean character, resembling the fauna of the 

 Bahamas. This indicates (if there be no uncertainty as to the 



