DEE 
90 
- CONCHOLOGISTS’ - 
EXCHANGE 
bright and glowing colors. Two of these genera, 
Tellina and Macoma, are represented in R. I. 
Genus Tellina, Linn., 17758. 
This genus contains over three hundred spe- 
cies living, and one hundred and seventy fossil. 
The animals inhabit all shores, living in sand 
and mud at no very great depths. They have 
long and slender divergent syphons; the man- 
tle is delicately fringed, and opens widely in 
front for the tongue-shaped foot, by which it 
travels about. The shells are generally thin, 
highly colored and delicately sculptured. The 
genus has divided into several sub-genera, two 
of which are represented in R. I. 
162.— Tellina ( Angulus) tenera, Say. 
Shell small, thin and fragile, white or tinged 
with rose, iridescent, concentrically wrinkled 
by sharp lines of growth, inequipartite, shortest 
and pointed behind ; 
valve, one larger than the other and grooved ; 
posterior lateral tooth distinct; anterior one 
ne oles: beaks behind the middle. 
Length, 33; height, 54; breadth, § inch. 
Discovered by Mr. Benjamin Say, brother of 
the great Naturalist, near Great Ege Harbor, 
New Jersey, and described by Thos, Say in 
Journ. Acad. Nat. Sci., Phila., ii, 303, 1822. 
Inhabits from Florida to the Gulf of St. Law- 
rence. Not very common north of Cape Cod 
Most abundant from Buzzard’s Bay to New | 
A very pretty little species living on | 
Jersey. 
all our sandy shores just below low water mark. 
Tellina (Angulus) modestus, Verrill. 
I have never seen this species; it was de- 
scribed in the April number of Silliman’s Jour- 
nal, 1872, page 285 
smooth, shining, iridescent, with fine concen- 
tric strize; color pink, straw colored or white, 
often banded. concentrically with these colors. 
He enters at some length upon the characteris- 
tics which distinguish it from A. tenera. He 
finds it in Vineyard Sound and Buzzard’s Bay | 
in six to ten fathoms water, on a sandy bot- 
tom, also in Long Island Sound, off New 
Haven, in mud. A figure of the shell is given, 
which, if printed of life size, is } inch in length, 
by 38 in breadth. 
In the “Invertebrate Animals of Vineyard 
Sound,” page 383, 1874, he re-names it Angu- 
lus tenellus, Verrill. In the Cat. Mar. Moll., 
hinge teeth, two in each | 
He describes it as being | 
1822, by the same author, he quotes it from 
Narragansett Bay as well as the above locali- 
ties, and says, “this may only be a variety of 
A. tener. 
163.—Tellina (Peronea) tenta, Say. 
Shell small, oval, thin and fragile, inequi- 
partite, the posterior end shortest, narrowed, 
warped and gaping widely; valves very con- 
vex, the left one more so, and bent far to the 
right, exterior shining, covered with very fine 
lines of growth, interior polished, white, tinged 
with yellow near the beaks and covered with 
radiating lines; margins indented; hinge deli- 
cate; cardinal teeth, two in the right valve and 
one in the left; lateral teeth minute: (Say says, 
“lateral teeth, none’). Length, 2; height, 2; 
breadth, + inch. 
Discovered by Dr. Ravenel, in South Caro- 
lina, and described by Say in American Con- 
chology, part seven (no date is given for this 
part. It was printed after Say’s death, which 
occurred in Sept., 1833). It inhabits from 
South Carolina to Cape Cod. It does not live 
near the shore, but is obtained by dredging in 
mud. We find it off Rumstick, at the mouth 
of Warren River. 
To be Continued. 
+ Oe = 
BRIEF NOTES ON THE LAND AND 
FRESH-WATER SHELLS OF MER- 
‘CER CO., ILL. 
BY WILLIAM A. MARSH. 
FAMILY RISSOIDE (Continued). 
Genus Somatogyrus, Gill. 
79.—Somatogyrus subslobosus, Say. 
Shell subglobose, whorls from 3% to 4, 
rounded, very rapidly enlarging; suture im- 
pressed, horn colored; aperture sub-ovate, 
umbilicus very narrow, nearly closed by the 
labrum; spire very short, convex. This shell 
is found in all the small lakes and sloughs very 
abundantly. I have never found it in the river, 
nor in any of our creeks. The animal is quite 
active at times. 
80.—Somatogyrus depressus, Tryon. 
Shell orbicular, rather solid; spire depressed ; 
whorls four, convex, last whorl large; umbili- 
