I04 LAND AND FRESH WATER MOLLUSKS 



Bulinus hordaceus Tryon, Mon. Fw. Univ. Moll. U. S., p. 170, pi. vii, fig. 

 19, 1872. 



Range. — Oregon, Washington, Vancouver Island. 



Fort Vancouver, Wash. ! near Puget Sound, Wash. ! 



This is the small species, having much the appearance of an Aplcxa., 

 which has been cited on the authority of Dr. J. G. Cooper as Aplexa 

 hypnorum from near Puget Sound. This error was afterward cor- 

 rected by Cooper himself. No observations have been recorded in 

 regard to the animal, and when these have been made it is entirely pos- 

 sible that the creature may turn out to be an Aplexa. It is entirely 

 distinct from A. hyp7ior7tm at an}' rate 



Genus Aplexa Fleming. 



Bulhi{s^.) LiNN'E, Syst. Nat., ed. x, p. 727, 1758. — Gmelin, Syst. Nat., vi, 



p. 3428, 1792. 

 Planorbis (sp.) O. T. Muller, Hist. Verm., II, p. 169, 1774. 

 TJ/r^^o (sp.) Walker, Test. Min. var., p. 15, 1787. 

 <CBulinus O. T. Muller, in Der Naturforscher (Halle), xv, p. 6, 1781 (after 



Adanson, Senegal, p. 5, 1757, non binomial). 

 <^Physa Draparnaud, Tableau, pp. 31, 52, 180 1 ; Hist, des Moll, de France, 



p. 55, 1805. 

 <CBulimus PoiRET, Coq. Fluv. et Terr., p. 41, 1801 ; not of Scopoli. 

 <^Bu//!!!us OKEii, Lehrb. d. Naturg., pp. x, 302, 181 5. 

 Aplexa Fleming, in Sowerby, Gen., fasc. vii, 1822 ; Hist. Brit. An., p. 276, 



1828. Ty^& BuHa hypiwruiii IJmwc, 1758. 

 <^Phyza Risso, Hist. Nat. Eur. Men, iv, p. 96, 1826. 

 Nauia (Leach, M.S.) Turton, Man., p. 129, 1831 (in syn.). — Leach, Svn. 



Moll. Gt. Brit., p. no, 1852. 

 <^ Bulinus Beck, Index Moll., p. 116, 1838; not Bulinus Tieck, op. cit., p. 



117, nor Philippi, Handb. Conch., p. 255, 1853. 

 Physa FiTZINGER, Syst. Verz., p. no, 1833 ; not of Draparnaud. 

 Aplexus Gv.K\, Turton's Man., ed. 11, p. 255, 1840. — Sowerby, Man., ed. 



II, p. 70, 1842. — Brow.n, 111. Conch. Gt. Brit., p. 135, 1844. — Chenu, 



Man., I, p. 481, 1859. 

 Aplexa Beck, Inde.x Moll., p. 116, 1838. — Philippi, Handb. Conch., p. 255, 



1853. — MoRCH, Vidensk. Meddel., p. 308, 1864. — Tryon, Struct. Syst. 



Conch., in, p. 103, 1884. 

 Nauta Beck (in syn.), Ind. Moll., p. 166, 1838. 

 Amplexa Brown, 111. Conch. Gt. Brit., ed. 11, p. 31, 1844 (err. type) ; not 



Amplexus Brown, op. cit., p. 45. 

 Aplccta Herrmannsen, Ind. Gen. Mai., i, p. 65, 1846. — Fischer, Manuel 



Conch., p. 511, 1883. 

 Myxas Gray, Proc. Zool. Soc. for 1847, p. 180, not of Leach, 1822. 

 Bulinus BiNNKY, Land and Fw. Sh. N. Am., 11, p. 97, 1865. — Dale, Ann. 



Lye. N. Hist. N. Y., ix, p. 356, 1870. 

 A^a«te Westerlund, Fauna Pal. Reg., v, p. 57, 1885. 



Shells of species allied to P/iysa, but usually more slender and 

 elevated, the mantle not extending beyond the margin of the aperture 

 and its edge entire, without filamentary appendages ; jaw strongly 



