190 
For tliis interesting species I am indebted to Mr. Josepli Bara- 
bino of New Orleans, who informs me that it inhabits Bayou Tecbe, 
in the parish of St. Mary, Louisiana. PL 33. 
Unio GLEBULUS. — Specific character. Oval orbicular; lateral 
teeth remote, very short, granulated. 
U. glehulus, nob. Transylvania Journal^ vol. 4, p. 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 umboniai 
slope : umboniai 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 declivisj noh. Transylvania Journal^ vol. 4, 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 umboniai slope : 
umboniai 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. 
Ohs. Several specimens were sent to me by Mr. Barabino, who 
informs me that they were found with the preceding by his friend 
Mr. J anin in the Bayou Teche. 
