COLIMACEA. MOLLUSCA. SUCCINEA. 195 



This species is found about the margins of ponds, and low, 

 damp places, where the surface is always moist. It crawls over 

 the mud, or up the stalks of plants ; and, although it seems to be 

 but little incommoded by water, it cannot endure being entirely 

 submerged, and seems not to have the power of directing its way 

 in the water, though it will generally float. 



The animal is larger than the shell ; its color pale, with minute 

 black points, which are assembled into stripes upon the neck, 

 and into squares, or bands, upon the sides ; the neck is granulate 

 above ; a black line passes each side on the neck, from the tip of 

 the tentacula, disappearing under the shell. The shell is so 

 vitreous, that all the markings of the animal and colors of the vis- 

 cera are seen through it, as are also the circulating vessels branch- 

 ing across the back, and the heart pulsating, and sending the 

 fluids through them. 



Further particulars will be stated under the next species. 



Succi'nea campe'stris. 



Shell ovate, thin^ transparent, pale-yellow ; whorls three, not 

 very oblique, very convex ; the last very large and turgid ; suture 

 deep ; aperture sub-oval. 



Figure 126. 

 State Coll., No. 86. Soc. Cab., No. 1254. 



Succinea campestris, Say ; Journ. Acad. Kat. Sc, i. 281. 



The general resemblance between this species and S. ovdlis, is 

 very great. It differs, however, in some well-marked particulars. 

 It attains a much larger size, is thicker and less fragile ; its color 

 is darker, having a somewhat smoky tinge. Its form is much 

 more robust, the breadth being proportionally greater ; the whorls 

 are much more convex and tumid, being regularly inflated, while 

 the upper portion of the large whorl of S. ovdlis is compressed, 

 so that its broadest portion is somewhat below the middle. The 

 whorls are less oblique. The aperture is more oval, being nearly 

 as broadly rounded above as below. Common length | inch, 

 breadth | inch, divergence 80'^ to 90°. 



It is more commonly found in moist places, but spreads itself 



