78 THE NAUTILUS. 
My next collecting was done at Mt. Lebanon, Bienville Parish, 
Louisiana. This is the locality discovered by Mr. T. Wayland 
Vaughan, and through his kindness in giving me the exact position 
of the bed, I was able to find it, after considerable digging, as the 
banks had caved down. I succeeded in getting a very interesting 
lot of fossils, including fine specimens of Anomia ephippoides. 
While waiting for a train as Shreveport I took a stroll along the 
Red River and a small tributary (“ Lake”) to the north of the city. 
Nothing was to be found along the river except quantities of dead 
Helices, etc. among the flood-debris, but which have practically no 
value, as their habitat may have been Arkansas, Texas, or Indian 
Territory. Along the shores of the “ Lake” I found some beautiful 
specimens of Unio alatus and U. anodontoides ; and Campeloma sub- 
solidum and Vivipara subpurpurea were quite plentiful. Although 
the Red River was extremely low, the ever-changing bars and the 
freshet-swept shores are unfavorable situations for mollusca; 
while in the smaller rivers and tributaries they are abundant. 
CHARLES W. JOHNSON. 
NOTE ON THE GENUS JOANNISIA. 
BY W. He DALL. 
In the Transactions of the Wagner Free Institute of Science vol 
III, p. 545, April, 1895, I proposed the name of Joannisia for 
Cyrenella oblonga Sowerby and another Philippine island species 
which had been referred to Cyrenella (or Cyrenoida Joannis) as the 
hinge of these species is quite different from that of the original type 
of Oyrenella (or Cyrenoida). The Marquis de Monterosato kindly 
calls my attention to the fact that in 1888 he had used the name 
Joanisia for a genus typified by Tylodina citrina Joannis (Nom. 
Gen. Con. Medit., p. 149). 
I would therefore modify the name as applied to the Philippine 
bivalve to Joannisiella. 
ISAAC LEA DEPARTMENT. 
[Conducted in the interest of the Isaac Lea Conchological Chapter of the Agassiz Associa- 
tion by its General Secretary, Mrs. M. Burton Williamson. } 
Before the November isstie of Tae Nauriius each member of 
Chapter will have received a copy of our new printed list of mem- 
bers. A number of new names appear upon the list. 
