46 BYTHINELLA. 
Genus BY THINELLA, Mog.-Tand. 
‘ 
A. Southern species, 
1. BYTHINELLA ATTENUATA, Hald. 
Hald., p. 22, t. 1, fig. 13. 
No other locality than the single one cited 
‘by Haldeman has occurred. It is very proba- 
ble that it is only a very elongated variety of 
B. Nickliniana, Lea. . 
2. BYTHINELLA NICKLINIANA, Lea. 
Hald., p. 21, t. 1, fig. 12. 
Inhabits streams connected with the Susque- 
hanna River in Pennsylvania, also various 
localities in Maryland and Virginia west of 
the Blue Ridge Mountains. The areas of dis- 
tribution of all the species of this genus appear 
to be very circumscribed. 
[27] 
