190 



For this interesting species I am indebted to Mr. Joseph Bara- 

 bino of New Orleans, who informs me that it inhabits Bayou Teche, 

 in the parish of St. Mary, Louisiana. PI. 33. 



Unio glebulus. — Specific character. Oval orbicular ; lateral 

 teeth remote, very short, granulated. 



U. glebulus, nob. Transylvania Journal, vol. 4, j9. 526. 



Desc. Shell transversely oval orbicular, sometimes subovate, very 

 convex, dark brownish : umbones not elevated above the general 

 curvature : beaks not prominent, (much eroded, exposing a wax 

 yellow surface :) hinge and basal margins correspondingly arquated ; 

 destitute of any prominent angle : anterior and posterior margins 

 almost equally arquated ; the former extending a little with age 

 into a more or less obtuse angle at the extremity of the umbonial 

 slope : umbonial slope slightly elevated : lunule not dilated : within 

 a little tinted with rosaceous : cardinal teeth deeply and approxi- 

 mately granulated and sulcated : lateral teeth remote from the car- 

 dinal teeth, remarkably granulated; length hardly greater than 

 their distance from the cardinal teeth : posterior accessory cicatrix 

 small and approximate. 



Ohs. The transverse simple rotundity of this shell, combined 

 with the much sulcated cardinal teeth and the remote, short lateral 

 teeth, readily distinguish it. Several specimens were sent to me 

 by Mr. Barabino, as inhabiting the same locality with the preced- 

 ing. PI. 34. 



Unio declivis. — Specific character. Anterior margin recti- 

 linearly and obliquely truncate. 



Unio declivis, nob. Transylvania Journal, vol. 4, j?. 527. 



Desc. Shell transverse, moderately thick ; posterior margin short 

 and obtusely rounded : beaks hardly elevated : hinge margin rather 

 elevated and compressed, angulated at tip : anterior margin recti- 

 linear, descending obliquely forward, to a prominent rostrum of 

 the anterior basal margin at the extremity of the umbonial slope : 

 umbonial slope not elevated above the curvature of the disk, but 

 is bounded on its anterior side by two slightly impressed lines : 

 basal margin arquated : surface deeply wrinkled : within tinged 

 with purplish : cardinal teeth oblique : lateral teeth distant from 

 the cardinal teeth, rectilinear, oblique with respect to the base. 



Obs. Several specimens were sent to me by Mr. Barabino, who 

 informs me that they were found with the preceding by his friend 

 Mr. Jauin in the Bayou Teche. 



