62 CONCHOLOGIA CESTRICA. 
DIAGRAM OF THE SUB-FAMILIES, GENERA, SUB-GENERA, AND 
SPECIES, OF THE FAMILY LIMNAEIDA. 
FAMILY. SuB-FAMILY. GENERA. p SPECIES. 
R columella, 
DIX. macrostoma, 
catascopium, 
LIMNAEINA. eae 
LIMNOPHYSA. desidiosa, 
humilis, 
caperata. 
ancillaria, 
heterostropha 
and Puysa. gyrina, ® 
PHYSINEE. lata. 
BuLinus. hypnorum. 
LIMNAEID. Sus-GEnus. 
PLANORBELLA. campanulatus. 
trivolvis, 
Sus-GENus. var. fallax, 
HELISOMA. 
bicarinatus. 
Sus-GENUusS. 
PLANORBIN, } MsNetus. SxACunIS. 
deflectus, 
Sus-GENUS. parvus, 
GYRAULIS. albus, 
dilatatus. 
Sus-GENUS. $ 
PLANORBULA. armigera. 
r GENUS. rivularis, 
{ ANCYLINA. { ANCYLUS. { tardus. 
Genus LIMNEZA, LAMARCK, 1799. 
Animal of Limnea desidiosa. —|W. G. B.} 
Fig, 116, 

Shell, dextral, spiral, oblong, or ovate, translucent, 
horn color; spire acute; last whorl ventricose ; aperture 
large, wide, rounded below; inner lip with an oblique 
fold; outer lip simple. 
Animal, tentacles flattened, triangular; mantle thick- 
ened in front; foot short, rounded. 
Sub-genus RADIX, MontTrort, I810o. 
Shell, sub-ovate, ventricose; aperture more than half 
the length of the shell, greatly expanded. 
