ANODON,—Ptate IX. 
angles, winged, with a compressed area above the 
angles, dorsal margin elevated, angular, lateral mar- 
gin concave near the angle. 
Lea, Obs. Unio, ii. p. 78. pl. xx. f. 64. 
Anodon Californiensis, Lea, probably the same. 
Hab. Rio Sacramento, Wahlamat. 
The truncated beak and the fine linear concentric 
stripes of dark colour unite the two species quoted, and 
separate them from others. 
Species 24. (Fig. 23, Mus. Cuming in Brit.) 
ANODON GIBBOSUS. An. testd ovald, valde inflata, tenui, 
viridi, subaurantid, levigatd, virido-nigrescenti con- 
centrice fasciatd, antice et medio tenué, postice late 
radiata, intus sulmoned et ceruleo-iridescenti, umbo- 
nibus gibbosis, prominentibus, corrugatis ; latere an- 
tico brevi, supra subangulato, margine dorsali brevi, 

recto ; latere postico perobliquo, superné obscuré an- 
gulato, termino acuminato, supra angulum alato, 
area postangulari trigond, elevatd, margine dorsali 
convexiusculo, margine laterali subconcavo, declivi. 
THE GiBBous ANopoN. Shell ovate, much inflated, 
thin, smooth, green, rather orange, concentrically 
banded with blackish-green, salmou-coloured and 
bluish-iridescent within, umboes gibbous, prominent, 
corrugated; anterior side short, angular above, dor- 
sal margin short, straight; posterior side very ob- 
lique, obscurely angular above, with the end acumi- 
nated, alated above the angle, postangular area tri- 
gonal, raised, with dorsal margin rather convex, la- 
teral margin rather concave, sloping. 
Say, Jay’s Catalogue of Shells, No. 1100. 
Hab. River Georgia. 
An obliquely oval and very tumid shell. 
