THE - CONCHOLOGISTS’ - 
EXCHANGE. 
Unio Je vettit, Lea, Sig., personal name for 
Col. E. Jewett, R=58. 
Shell oblong, smooth, rather inflated, very 
inequateral; rather thin, brownish; faintly 
rayed with distant marks of growth. ‘The epi- 
dermis is scaly, like that of U. Blandingianus 
and obesus. ‘The posterior slope is wide and 
raised into a sharp carina, which descends to- 
wards the beaks. Nacre white, with salmon 
near the margin. Lateral teeth very long, 
lamellar ; cardinal teeth small. Lake Wood- 
ruff and Lake Beresford, Fla. 
Unio Kleinianus, Lea, Sig., personal name for 
J. T. Klein, a Prussian naturalist, who died 
in 1759, R=75. 
Shell nearly oval, plicated irregularly be- 
tween the lines of growth; color dark brown, 
polished. Posterior slope large, with a high 
abrupt carina. Umbonial ridge angular. Beak 
inflated, posterior margin truncated, cavity deep, 
nacre white. Habitat, Suwanee River, Fla. 
Unio lepidus, Gould, Sig., elegant, R54. 
Shell elongated, ovate, thin, ventricose, very 
inequilateral, oblique: disc olivaceous, scarcely 
radiated; umbos tumid. Anterior margin 
rounded, posterior margin arcuate ; cardinal 
teeth erect, lamellar, fimbriated ; lateral teeth 
straight, acute Nacre silvery white, iridescent 
transverse. Axis 23 inches long. Lake 
Monroe, Fla. 
Its affinity is very close to U. ¢rosculus, Lea, 
but is Zexger, more fragile, and cardinal teeth 
more compressed. 
Unio minor, Lea, Sig., little, R=g2. 
The largest specimens we find are 1.3 inches 
wide, .8 long, and .56 diameter. Shell elliptical 
when mature, and obovate when young ; very 
inequilateral ; inflated below the umbos ; near- 
ly black or olive-green above, not polished, 
finely striated, with transmitted light a yellowish 
brown color is noticed. Faint rays are some- 
times seen. ‘The back view is that of an acute 
isosceles triangle, like that of U. dectsus, Lea. 
Umbonial ridge nearly obsolete ; cardinal teeth 
not bifurcate, many pitted, A distinct cicatrix 
(the third) may be seen on the side of the front 
portion of the cardinal teeth. This character 
is peculiar, and is seen in U7, ¢rosczlus, Lea, in 
nearly the same position. No other North 
American species of Unio, it is believed, will 
show such a cicatrix. Habitats Lake Wood- 
ruff, Lake Beresford, and found by Mr. C. T, 
Simpson, near Manatee River, on the west side 
of Florida. 
U. modioliformis, Lea, Sig., like the Modiolus 
in outline, which is a genus of marine bi- 
valves, so named from their resemblance to 
a small drinking vessel of the ancients, 
Shell smooth, obovate, very narrow in front, 
broadly rounded behind, and sometimes slightly 
| emarginate on the basal margin, inflated, thin, 
translucent, brown, grayish-black, or lutescent. 
Rays usually present and mostly on the poster- 
ior half. Lines of growth many and close. 
Nacre thin, cream color or white, mingled with 
purple. The lateral teeth are slender, long 
and almost on the very margin of the dorsum. 
This is a South Carolina species, but we found 
itin Lake Beresford, and elsewhere in Florida. 
Lea gives this shell as a sample of the obovate 
form in page xxvii of the Introductory Chapter 
of his Synopsis, and yet he classifies it 
with the ovate shells on page 44. L. C. 4th. 
Edition. His type was 2.7 inches transversely. 
We have not found any as large as that, but 
have specimens, apparently mature, much 
smaller. 
(Zo be Continued.) 
Prof. Faber, of Germany, has invented pen- 
cils for writing upon glass, porcelain and met- 
als, in red, white or blue The pencils are 
made of four parts of spermaceti, three of tal- 
low, and two of wax, to which he adds six 
parts of either red lead, white lead, or Prussian 
blue, according to the color desired, 
RECOLLECT that on and after May Ist, 1888, 
all new subscribers, and all old subscribers re- 
newing their subscriptions, will receive a choice 
of three premiums, viz: Ist, 25 cents worth of 
Choice Shells ; 2d, a free copy of Berlin H. 
Wright’s New Check List of Fresh Water bi- 
valves of North America; 3d, a free copy of. 
D. D. Baldwin’s Land Shells of Hawaiian 
Islands. 
