190 AMERICAN MIDLAND NATURALIST 
by Rafinesque’ as Obliquaria (Rotundaria) tuberculata to the 
genus Quadrula and thus Ortmann’s comb. nov. is preoccupied. 
The fact that Rafinesque’s species properly belongs in the genus 
Rotundaria as urged by Ortmanni’ does not affect the priority 
of the combination as used by Simpson. In reference to this 
matter Dr. W. H. Dall” says, ‘‘This name [Quadrula tuberculata 
(Raf.) Simpson, 1900] having been accepted by Simpson in 1900, 
no subsequent different use of it is permissible.’”’ Ortmann’s 
new combination is therefore unavailable. 
4. UNIO VERRUCOSUS Say, 1834, Am. Conchology, Part VI. 
In his paper which was published with the sixth number 
of the Am. Conchology, Say uses the name Unio verrucosus and 
credits the species to Rafinesque. Rafinesque described, indeed, 
in 1820, a species which he called Obliquaria (Ellipsaria) verru- 
cosa, but neither his figure nor his description are intelligible and 
Say must be held responsible for the name. Hence Barnes’ name 
has priority over the name verrucosa. 
Agassiz, as before noted, transferred the species to the genus 
Tritogonia as Tritogonia verrucosa (Raf.) Agassiz. 
5. TRITOGONIA VERRUCOSA (Raf.) Agassiz, 1852, Arch. fur 
Nature: Jahre. 18; Bde 1:48: 
5. a. TRITIGONIA VERRUCOSA (Raf.) H. M. Smith, 1899, 
Bull Us‘. hich: Cone: 205 spl eka 
Merely an error in the spelling of the generic name. 
6. QUADRULA VERRUCOSA (Say”) Geiser, 1911. The Academ- 
ician I: 15. (combinatio hypothetica). 
The new combination is, however, preoccupied. Baker, 1898’, 
. . 8 . 
transferred the species described by Barnes as Unio verrucosus 
1 An. Gen. Sci. Brux. V.: 308. [1820]. 
2 Ortmann in lit. 
* Dall in lit. 
* Entitled, ‘‘An attempt to exhibit a Synonymy of the Western North 
American species of the genera Unio and Alasmodonta.” 
5 An. Gen. Sci. -Brux. V: 304 [1820]. 
® Erroneously credited to Rafinesque. 
’ Nat. Hist. Surv. Chgo. Acad. Sci. III (1): 85, pl. XXIII [1898]. 
§ Am. Jour. Sci. VI: 123, pl. V, fig. 6 [1823]. 
