m 
VENERXCARDIA oblonga. 
TAB. CCLXXXIX .- Three Lower Figures* 
Spec. Char. Transversely oblong, unequal sided, 
subquadrangular, gibbose, with 13 knotted 
costae. 
Length about two-thirds the width ; costae strong, 
obtuse, irregularly knotted, margin strongly 
toothed. 
Except in form this strongly resembles var. /3. of th© 
last; it is not quite so common, but I have received them 
both together from many Friends. 
It also occurs in France, but I think has not been 
described. 
