164 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



tliat a decidedly closer relationship exists between these species than 

 would be expected in different genera. 



Genus Physa, Draparnaud. 



HulIa {sp.), Linne, 1758 (B. fontinalis, L.) ; I'lanorhis (sp.), Miiller, 

 1774 {P. bulla, 'MuW. = B. fontmalis, L.) ; Bulimis (sp.), Miiller, 

 1781 {B. perla, Miill. = B. fontmalis, L.) ; Tarho (sp.), Walker, 

 1787(7'. stagnalis, Walker = B. hypnorum, L. ) ; Fhysa, Draparnaud, 

 1801 {B. fontinalin, L.) ; Physina, Ilatinesque, 1815 (emended 

 form); LymiKZa (sp.), Say, 1817 (Z. heterostropha, Say = Z>. 

 fontinalis, L.); Anisus (sp.), Studer, 1820 {B. fontinalis, 1j.); 

 Aplexa, 'Fleming,' Sowerby, 1822 {B. hypnornm, 'L.); Nauta, 

 'Leach MS.,' Turton, 1831 {B. hypnorum, L.), in synonymy; 

 Bivicula, Fitzinger, 1833 {B. fontinalis, Ij.); Physella, Haldeman, 

 1842 {P. {Physella) ylohosa, Hald. = B. fontinalis, L.) ; Physodon, 

 Haldeman, 1842 {P. {Physodon) microstoma, Hald. = B. fontinalis, 

 L.) ; Aplccta, Herrmannsen, 1846 (emended form oi Aplexa); 

 Ilyxas, Gray, 1847 {B. hypnomm, L.), not Myxas, Leach, 1822 ; 

 Costatella, Dall, 1870 {P. costata, Newc. — B. fontinalis, L., 

 syntonic form). 

 Type, Bulla fontinalis, Linne. 

 Shell as in family, averaging 15 mm. in altitude; habitat aquatic 



situations of all sorts. 



Physa fontinalis (Linne). 

 Bulla fontinalis, Linne, 1758; Lymncea heterostropha. Say, 1817; 

 Physa gyrina, Say, 1821 ; P. ancillaria. Say, 1825 ; P. concolor, 

 Haldeman, 1841 ; P. bullata, Gould, 1855, not of Potiez and 

 Michaud, 1838; P. triticea, Lea, 1856; P. Lordi, Paird, 1863 

 (syntonic form); P. ampullacea, Gould in Carpenter, 1863; 

 P. Nuttalli, Lea, 1864; P. vemista. Lea, 1864; P. propinqua, 

 Tryon, 1865; P. politissima, Tvyon, 1865; P. malleata, Tryon, 

 1865; P. hordacea. Lea, 1866 ; P. Wolfiana, Lea, 1869 ; P. Parkeri, 

 Currier in DeCamp, 1881 (syntonic form) ; Physella Columbiana, 

 Hemphill in Keep, 1888 (syntonic form). 



Physa fontinalis acuta (Draparnaud). 



Physa acuta, Draparnaud, 1805; P. osculatis, Haldeman, 1843 (as 

 subsequently restricted) ; P. Mcxicana, Philippi in Martini and 

 Chemnitz, 1844; P. virginea, Gould, 1847; P. humerosa, Gould, 

 1855 (syntonic form) ; P. virgata, Gould, 1855 ; P. costata, 

 JS^ewcomb, 1861 (syntonic form) ; 7'. G'ffi^«, Tryon, 1863 (syntonic 

 form); P. striata. Lea, 1864, not of Menke, 1830; P. Staffordi, 

 Lea, 1864; P. parra. Lea, 1864; P. Ilawni, Lea, 1864; 

 P. Grosvcnori, Lea, 1864; P. Traski, Lea, 1864; I\ Bland i. 

 Lea, 1864 ; P. Cooperi, Tryon, 1865 ; P. diaphana, Tryon, 1865; 

 P. distinguenda, Tryon, 1865 ; P. occidentalis, Tryon, 1865 

 (syntonic form) ; 1*. sparsistriata, Tryon, 1865; P. Borhignyana, 

 Lea. 1866; P. coniformis, Tryon, 1866; P. Carltoni, Lea, 1869; 

 P. IFaltsi, Arnold,' 1910 (syn'tonic form). 



