THE NAUTILUS. 101 
Shuttleworth (1. c. p. 98). But it is very improbable that it 
is really Haldeman’s species. 
All this leads to the very definite conclusion that A. obscuris 
Hald. is restricted to the head-waters of the Tennessee system 
in Virginia and Tennessee and does sot occur in Florida or the 
West Indies. : 
Clessin (Con. Cab., Ancylus, p. 14) designated A. obscurus as 
the type of his group, Haldemania. As both the genuine ob- 
scurus and the species that he took for it are Levapices it is 
immaterial which should be considered to be his type. Halde- 
mania having been preoccupied by Tryon (1862), Clessin’s 
name can not be used and must fall into the synonymy of 
Levaper. 
Il. 
FerRRIssiA (LA#VAPEX) oOBscURA (Hald.).* 
Ancylus obscurus Haldeman, Mon., 1844, p. 9, pl. I, fig. 5; 
W. G. Binney, L. and F.-W. Shells, Pt. IT, 1865, p. 139, fig. 
232. 
Haldeman’s unique type came from the Nolachucky River, 
below Greeneville, Tenn. It measured: Length 5, width 3.5, 
alt. 1.5 mm. I have before me three specimens (Coll. Walker, 
No. 36292) collected by Goodrich in the South Fork of the 
Powell River at Big Stone Gap, Wise Co., Va. They measure 
respectively: Length 6.5, width 5, alt. 2.5 mm.; length 6.3, 
width 4.5, alt. 2 mm.; length 5.3, width 4, alt. 1.5 mm. 
It will be noticed that the dimensions of the smallest speci- 
men agree quite exactly with those of Haldeman’s type. It 
also agrees in other particulars with his description and J have 
no doubt but that it is the same species. If so, the type was 
not fully matured and the largest specimen given above and to 
be figured hereafter represents the fully matured form. As 
shown by the figures it is an obovate shell, broadly rounded 
anteriorly and regularly, though more narrowly, rounded pos- 
teriorly, the lateral margins being about equally curved; the 
* The species will be figured in connection with the concluding part of this 
paper. 
