
MOLLUSCS, VERMES AND HYDROZOA 

near the middle of the body 
whorl, but one or both are 
sometimes absent. ‘The slen- 
der body is pale orange above 
and bluish white below, 
banded by irregular interrupt- 
ed black lines. It occurs in 
the above mentioned local- 
ities andis very abundant inthe 
Delawareand Schuylkill rivers. 
G. multineata, Fig. 159, 1s also common in the tributaries of the 
Delaware river and in the Middle States. It has a gradually tapering very 
slightly convex 54 to 34 inch 

FIG. 158. Goniobasis virginica. 
long conical yellowish-brown 
shell of seven whorls marked 
by a number of reddish or 
brown bands, a pointed ob- 
long aperture and a usually 
eroded apex. It is also com- 
mon to Eastern and Middle 
States river systems. 
Ancutosa. Many species occur in all the Middle-Western and South- 
ern States but only one species is generally distributed in the Middle States. 
A. carinata, Fig. 160,has a conical dark horn-colored or blackish 34 inch 
long shell, very variable in appearance, with three or four whorls, all more 

FIG. 159. Goniobasis multineata, 
erlessy keeled on the 
middle of the whorls. 
The suture is but slightly 
indented, the apex often 
truncated but usually 
eroded, and the aperture 
oval and one-third as FIG. 160. Anculosa carinatus. 
longas the shell. Varieties of this species arevery generally found in streams 
and rivulets throughout the Middle and some of the New England States. 
SuccinEA. This genus contains the most generally distributed semi- 
aquatic snails which are only a part of their existence in freshwater, making 
their homes in marshes and the mudbanks of ditches, ponds and streams and 
are found in swampy places or on plants along the banks. They are to be 
distinguished from the aquatic snails by the presence of four cylindrical 
tentacles, the longer bearing the eyes. They are not desirable in the 
aquarium, but are frequently introduced with aquatic plants. 

229 
