300 Miscellaneous. 
These ribs are crossed in the middle of each of the last three whorls 
by other spiral ribs, of which there are three on the last, two on the 
next, and one on the middle whorl. The spiral or transverse ribs are 
only half the width and thickness of the longitudinal ribs. Base of 
the last whorl smooth. Suture deep and distinct, giving the spire 
rather a turreted appearance. Aperture oval, simple, contracted at 
the upper angle and smooth within. There is a slight fold on the 
pillar, forming behind it a small umbilicus. Length ~4, breadth {5 
of an inch. Somewhat resembles Odostomia pupa of Searles Wood 
in markings, and Rissoa Zetlandica in form. 
Fusus Berniciensis. From the hooks on fishing lines in deep water. 
Rostellaria Pescarbonis, Sow. 
Scissurella crispata. Alive, adhering to stones like Hmarginula. 
The shell has no operculum, but it is to be regretted that Mr. Bar- 
lee did not observe the animal. 
Tellina balaustina. One specimen, half-grown. 
Descriptions of new Freshwater Shells. By 'T. A. Conran. 
The following new freshwater shells from Georgia were kindly 
lent me for description by J. Hamilton Couper, Esq. 
Unio. 
U. securiformis. Suborbicular, thick, compressed ; valves slightly 
convex ; umbo flattened, marked with obtuse, narrow, divaricated 
plaits ; plaits on the lower half of the valves obscure and interrupted ; 
umbonial slope rounded; posterior slope with strong oblique plaits 
towards the apex; beaks eroded; epidermis black; within white ; 
cardinal teeth large, direct, profoundly sulcated. 14: 14. 
Inhabits Flint River, Georgia. 
U. stagnalis. Widely elliptical, ventricose, rather thin; towards 
the posterior extremity very thin and fragile; anteriorly regularly 
rounded ; posteriorly somewhat pointed, with an acutely rounded ex- 
tremity; basal margin regularly curved; summits prominent, eroded; 
posterior margin very oblique and nearly straight ; epidermis ochra- 
ceous and olivaceous ; rays green, not very distinct on the middle 
and anterior side, but more so posteriorly, some rather broad, others 
linear ; posterior slope dark-coloured, rayed ; within white and highly 
iridescent posteriorly ; cardinal teeth much compressed and oblique, 
double in each valve; lateral teeth very slightly curved, finely gra- 
nulated. 34. 
Inhabits mill-ponds ; Ogeechee River, Georgia. 
U. Ogeecheensis. Elliptical, thin, inflated ; posterior side some- 
what pointed, extremity subangular ; valves slightly contracted from 
beak to base; summits rather prominent, decorticated, slightly un- 
dulated ; epidermis ochraceous with interrupted green rays, some of 
them broad; within white, highly iridescent posteriorly; cardinal 
teeth obiique, compressed ; lateral teeth rectilinear. 3. 
Inhabits Ogeechee River, Georgia. 
Allied to the preceding, but has a lighter-coloured epidermis with 
