CONTENTS. 



Plate XXXVI. Fig. 2, Unio eollinus. 



,, XXXVII. Fig. 1, Unio sowerbianus. 



,, ,, Fig. 2, Unio politus. 



„ XXXVIII. Fig. 1, Unio nexus. 



,, ,, Fig. 2, Unio greenii. 



,, XXXIX. Unio shepardianus. 



., XL. Fig. 1, Unio compressus. 



,, XL. Fig. 2, Unio capssformis. 



DESCRIPTION OF A NEW ANADONTA. 



ANADONTA CARINIFERA. 



Shell narrow, elliptical, compressed, thin and fragile; anterior side 

 narrow, rounded at the extremity; posterior side produced, subcunei- 

 form, truncated at the extremity; hinge margin long, straight, elevated 

 or slightly ascending, from anterior to the posterior extremity; beaks 

 not elevated above the dorsal line; basal margin straight in the middle; 

 colour of epidermis olive-green inferiorly, darker above; hinge margin 

 Avithout a callous. Length, 21 inches; height, 11 inch. Inhabits rivers 

 in Kentucky. 



This species is in the fine collection of my friend Mr. John Phillips, 

 who informs me that it is from the Ohio or one of its tributaries below 

 Louisville. It has much the outline of Unio carinifera of Lam. (the 

 common variety of U. complanatus ,) but is proportionally more elon- 

 gated, and the posterior extremity resembles that of Unio declivis, 

 except that it is truncated at the tip. 



Unio gibbosus, var. perobliquus, pi. xxvii. fig. 2, 1 have ascertained 

 to be a species; it will therefore take the name of Unio per obli quits. 



NEW FRESH WATER SHELLS OF THE UNITED 

 STATES, &c. 



For sale by J. Dobson, a few copies of this work, which contains 

 coloured illustrations of bivalve and univalve shells, and embraces a 

 monography of the genus Anculotus. Most of the species described 

 in this book were obtained by the author in Alabama. 



NORTH AMERICAN HERPETOLOGY. 



Just Published, and for sale by J. Dobson, 108 Chesnut Street, 

 NORTH AMERICAN HERPETOLOGY; 



OR A DESCRIPTION OF THE 



REPTILES INHABITING THE UNITED STATES. 



BY JOHN EDWARDS HOLBROOK, M. D. 



Professor of Anatomy in the Medical College of the State of South Carolina, Member 



of the Royal Medicai Society of Edinburgh, Corresponding Member of the 



Academy of Natural Sciences of Philadelphia, and of the New 



York and Baltimore Lyceums of Natural History. 



Vol. I. royal 4to, with splendid Coloured Plates. 

 This beautiful work will consist of four volumes, royal quarto, illus- 

 trated by numerous finely coloured plates — price $10 per volume. 



