62 
James R. Flowers and Grover C. Miller 
Snails (Mollusca: Gastropoda) of North America” (Burch 1973, 1982), 
respectively. William F. Adams (Army Corps of Engineers, Wilmington, 
North Carolina) verified these identifications. The sphaeriacean clams 
were identified by Gerald L. Mackie (University of Guelph, Ontario, 
Canada). 
Specimens were retained in the author’s collection for further 
study. 
RESULTS AND DISCUSSION 
Twenty-three species of molluscs (13 gastropods and 10 bivales) 
were collected from the upper Neuse River and its tributaries. This 
note reports only the six species that have not been previously 
recorded form the Neuse River system. 
Ferrissia fragilis (Tryon, 1863) (Gastropoda: Pulmonata: Ancylidae) 
was encountered at 12 stations in five counties — Wilson, Franklin, 
Johnston, Wake, and Durham — primarily on debris (wood and leaves) 
and macrophytes of the littoral zone in lentic and lotic habitats. 
Ferrissia hendersoni (Walker, 1908), previously reported from the 
Neuse basin by Walter (1956) and Dawley (1965) and listed as a 
species of special concern (Adams et al. 1990), was not found. 
Basch (1963) considered F. hendersoni to be a variant of the 
“super species” F. fragilis; thus, further research and taxonomic 
clarifications are needed to determine the actual status of these 
two limpet snails. 
Another limpet, Laevapex fuscus (Adams, 1841) (Gastropoda: 
Pulmonata: Ancylidae), was taken from rocks and debris in Wilson, 
Franklin, and Durham counties. Previously, Laevapex diaphanus 
(Haldeman, 1841) (Gastropoda: Pulmonata: Ancylidae) was reported 
from 22 stations in the Neuse River basin (Walter 1956); we did 
not find it during our survey. Although Basch (1963) reported the 
distribution of F. fragilis to be widespread throughout North America 
and L. fuscus to occur within the southeastern states, this is the 
first report of these two limpet snails from the Neuse drainage, 
specifically. 
We collected the large planorbid, Planorbella trivolvis (Say, 
1817) (Gastropoda: Pulmonata: Planorbidae), from wood and leaf 
substrates at two lotic stations in Franklin and Johnston counties, 
located on the Little River at US 401 and Cattail Creek at SR 
1738, respectively. Other published reports of P. trivolvis from North 
Carolina include Lake Waccamaw (Pilsbry 1934) and Greenfiled Lake 
(Adams 1990). 
Powell’s Pond at SR 2227 in eastern Wake County was the 
only station from which Gyraulus deflectus (Say, 1824) (Gastropoda: 
