OF CONCHOLOQY. 33 



DESCRIPTION OP A NEW SPECIES OP MONTACUTA. 



BY JOHN H. THOMSON. 



MoNTACUTA GouLDi, Thomson. Plate 1, fig. 15. 



Description. — Shell minute, diaphanous, rhomboidal inequi- 

 lateral, not compressed. Beaks rather prominent, not in contact 

 with an excavated areola in front. Basal margin ne.irly straight, 

 ends obtusely rounded, forming a rhomboidal outline, regular 

 lines of growth, with an opaque white thickened band surround- 

 ing the margin; hinge with the cartilage occupying a pit be- 

 tween two rather strong teeth. 



Hah. — N. Bedford Harbor, in the interstices of a piece of 

 timber dredged in sandj bottom. 



Collection of Philadelphia Academy of Natural Sciences, and 

 of Geo. W. Tryon, Jr. 



This interesting shell I submitted to the late Dr. A. A. Gould 

 but a few weeks previous to his death. He at once decided it to 

 be a new species. As a slight tribute of respect for his great 

 scientific attainments I dedicate it to his memory. 



