ANODON. 
PuaTte XXVII. 
Species 102. (Mus. Walpole.) 
ANODON IMBECILLIS. Anodon testdé oblongo-ovatd, 
aqualiter tumidd, tenui, levigatd, prope umbones 
tenwiter rugatd, pallidé fulvd, viridi laté fasciatd 
et radiata; ints cceerulescenti; latere antico 
brevitisculo, ad termiinum rotundo ;latere postico 
oblongo, margine dorsali recto, cuneato, margine 
laterali obliquo, termino subtruncato ; margine 
ventrali obliqué convexo ; umbonibus subplanulatis 
acutis, undulatim tuberculatis. 
IMBECILE ANopon. Shell oblong-ovate, equally 
tumid, thin, smooth, finely wrinkled near the 
umboes; pale fulvous, widely banded and rayed 
with green; bluish within; anterior side rather 
short, rounded at the end; posterior side oblong, 
dorsal margin straight, cuneated, lateral margin 
oblique ; end subtruncated ; 
obliquely convex; umboes rather flat, 
tuberculated in waves. 
Lea, Ann. Ph. Trans., 1837. 
Hab. Ohio River. 
More full and cylindrical than An. incertus, with the 
umboes tuberculated and nearer the centre. 
THE 
ventral margin 
acute 

Species 103. (Mus. Walpole.) 
Anopon Burrovucuranus. An. testd ovato-subtrigund, 
tent, tumidd, brevi, obtusa, fusco-fumigata, intis 
ceruled ; latere antico breviisculo, subrotundo ; 
latere postico subexpanso, obliqué obtuse angulato, 
verss marginem ventralem truncato ; margine 
ventrali rectiisculo, umbonibus subcompressis, 
levigatis. 
Burroucus’ Anopon. Shell ovate-subtrigonal, thin, 
tumid, short, obtuse, smoky-brown, bluish 
within ; anterior side rather short, rather rounded, 
posterior side somewhat expanded, obliquely, 
obtusely angular, truncated towards the ventral 
margin; ventral margin rather straight, umboes 
rather at, smooth. 
On Unio, vol. ix. pl. 16, f. 49. 
Anodon oblitus, Lea. 
Anodon Kennicotti ? Lea. 
Hab. Isl. Luconia. 
Lea. 

Judging from the outlines, it appears probable that 
the names above quoted may only refer to varieties of 
this species. 

Species 104. (Mus. Walpole.) 
ANODON SHOWALTERI. An. lestd ovatd, tenui, levigatd, 
pallidée fulvd, late viridi radiata ; latere antico 
brevitisculo, margine dorsali brevissimo, leviter 
cuneato ; latere postico producto, subacuminato ; 
wmbonibus parvis, subcentralibus, undatim tuber- 
culatis ; margine ventrali equaliter concavo. 
Swowatrer’s ANopoy. Shell ovate, thin, smooth, pale 
fulvous, widely rayed with green; anterior side 
rather short, dorsal margin very short, slightly 
cuneated; posterior side produced, subacumi- 
nated; umboes small, subcentral, tuberculated in 
waves; ventral margin equally convex, 
Lza. Obs. on Unio, vol. ix. pl. 33, f. 282. 
Hab. Alabama. 
The most remarkable character of this species is the 
breadth of the green rays as compared with the very 
narrow intervals. 

Species 105. (Mus. Walpole.) 
Anopon GLaucus. An. testd elongato-subovatd, con- 
centrice minutissime rugato-striata, obscuré olivaced, 
intus salmoned, verstis margine subceerulea ; latere 
antico acuminato, hianti, margine dorsali recto, 
cuneato ; latere postico producto, hianti, margine 
dorsali recto, obtuse cuneato, margine laterali declivi ; 
medio amplo, umbonibus prominentibus, ovatis, 
margine ventrali post medium convexo. 
Tue GLaucous Anopon. Shell elongato-subovate, con- 
centrically very minutely striated, dull olive 
salmon within, bluish towards the margins; 
anterior side acuminated, gaping, dorsal margin 
straight, obtusely cuneated, lateral margin sloped ; 
middle ample, umboes prominent ovate, ventral 
margin convex behind the middle. 
Lamarck. Anim. S. vert. 
Hab. Mazatlan. 
This species has an affinity with An. Blainvi’- 
June, 1870. 
