
MOLLUSCS, VERMES AND HYDROZOA 

Found at Lower Cape Fear river in the vicinity of Wilmington, N. C. 
No other locality has been reported. 










— Sra a> 
ip? \ iy 
FIG. 171. Cape Fear river Snail, Planorbis magnificus. Four views. 
There are many other smaller species of Planorbes but their size 
would preclude their use in the aquarium, though they are nearly all hardy 
and will survive, except the very cold water species. 
SEGMENTINA. ‘These snails differ from the Planorbes in having pro- 
jections or teeth within the aperture of the shell, which is discoidal with 
but few of the whorls visible on both sides. 
S. armigerus, Fig. 172, has a light-brown polished shell % to 3¢ inch 
in diameter, with the lip much darker. The four sub-cylindrical whorls 
are slightly keeled SV 
upon the left side and 
show faint lines of 
growth. The right 
side is nearly planed 
with a slightly de- FIG. 172. Segmentina armigerus. Enlarged. 
pressed centre. The body isa dull grey. It is a tiny insignificant snail 
to but little purpose in the aquarium. Quite generally met with in the 
Eastern and Middle States. 
S. wheatleyi, Fig 173, is a still smaller species, rarely over % inch in 
diameter, having a slightly keeled shell with the two and a half whorls 
al 

distinctly outlined on 
the right side and lost 
in the depression of 
the left side. The 
aperture is at an angle 
pointing to the left. 
Inhabits rivers and lakes of the Eastern and Middle States. 

FIG. 173. Segmentina wheatleyi. Enlarged. 
235 
