llllllHllimiiiin- 
270 
UNIONIDiE. 
with a quantity of other fresh-water and land shells, 
all now found alive in the neighbourhood, as Pisidium 
amnicurriy Valvata obtusa, &c. &c. 
Order IV. UNIONA CPA. 
Fam. 4. UNIONID^. 
Animal with mantle lobes free all round except at 
the back, the hinder edge forming, when in 
conjunction, two holes for the passage of the 
water, food, and rejectamenta, the upper (b) 
small, simple, the lower («, a*, a**) bearded 
Fig, 65. 
Anodon cygneus, 
a, Lower siphon ; a*, magnified ; bf Upper siphon; c, Foot. 
