UNIO 731 
lines and towards the umbones more or less corrugated ; um- 
bones eroded. placed well in front; nacre white, iridescent ; 
cardinal teeth rugose; laterals thin, elongate; anterior cica- 
trices not deep; posterior light, scarcely impressed. 
Length 26, height 15, diam. 10.5 mm.” (Smith). 
Type locality, Lake Mweru, Central Africa. 
Unio mweruensis EF. A. Smiry, Pr. Mal. Soc. London, VIII, 
1908, p. 13, text figures. 
The following species are of Rafinesque, and | am utterly 
unable to make anything out of them: 
Unio dilatata, elliptica, fasciata, fragilis, levigata, nervosa, 
ziridis, sonata, all in Monograph, 1820; Unio bicolor, calendis, 
castaneus, chloris, diaphanus, fontimalis, fulvus, lasmabrachys, 
montanus, pallens, platiolus, rivuiaris, rimosus, teneltus, venus, 
all in Continuation of Monograph. 1831. 
Other indeterminate Unionide of Rafinesque are: Amblema 
antrosa, costata, gibbosa, olivaria, rubra, torulosa; Lasmonos 
fragilis; Obovaria obovalis, pachostea; Obliquaria triangularis, 
attenuata, atroviolacea, bullata, cliffordiana, cuprea, cyphia, 
ellipsaria, fasciolaris, flava, flexuosa, lateralis, lineolata, nodu- 
lata, obliquata, pusilla, quadrula, sintoxia, sinuata, subrotunda, 
all in Monograph, 1820. Bariosta diploderma, ponderosus, wit- 
tatis; Epilobasma biloba; Toxolasma cinerescens, cyclips, flex- 
us, in Continuation of Monograph, 1831. 
The following are also indeterminate and spurious Unios: 
Unio tahetianus CatLow and Rerve, Conch. Nom., 1845, p. 
64. Is probably U. taitianus Lea. 
Unio radula Say, N. Harm. Diss., 1829, p. 323. 
Unio plombarius Viit.A, Disp. Conch. Terr. Fluv., 1841, p. 62- 
Unio pequottianus Lanstey, Am. Jl. Sci., 1845, p. 277. 
Unio tridescens Conran, Cov. of Monog., No. If. 
Unio angusta L,AMARCK, An. sans Vert., VI, 1819, p. 80. 
Unio conus SPENCLER, Skriv. Nat. Selsk., 1793, p. 60. 
Unio delphinus SpENGLER, Skriv. Nat. Selsk., 1793, p. 63. 
