FAMILY SIPHONARIID^E III 



Family SIPHON ARIIDJE. 

 Genus Siphonaria Sowerby. 



Siphonaria SOWERBY, Genera of Shells, pt. xxi, Jan., 1824 ; Proc. Zool. Soc. 

 London, for 1835, p. 6. DALL, Am. Journ. Conch., vi, p. 31, 1870. 



Muretia D'ORBIGNY, Voy. Am. Mend., p. 682, 1846. Not Mouretia Sow- 

 erby, 1835. 



Trimusculus (SCHMIDT, MS.) M5LLER, Isis, 1832, p. 132. 



f Liria GRAY, Phil. Mag. and Journ., LXIII, p. 275, April, 1824. 



The type of Liria is Le Liri Adanson, Senegal, p. 32, pi. 2, fig. 

 2, 1757 ; stated by Gray to be a synonym of Sowerby's genus, but it is 

 probable that Adanson's shell is not a Siphonaria. 



Subgenus Siphonaria s. s. 

 Siphonaria DALL, Am. Journ. Conch., vi, p. 31, 1870. 



Shell solid, porcellanous, with subcentral apex and radial sculpture ; 

 inner lateral teeth of the radula bifid, outer trifid. Habitat, tropical 

 or warmer seas. Type, S. sip ho Sowerby. 



Subgenus Liriola Dall. 

 Liriola DALL, Am. Journ. Conch., vi, p. 32, 1870. 



Shell thin, horny, with apex eccentric ; smooth or faintly radially 

 striate. Habitat, cooler or temperate seas. Type S. thersites Car- 

 penter. 



Siphonaria (Liriola) thersites Carpenter. 



Siphonaria thersites CARPENTER, Ann. Mag. N. Hist. (3), xrv, p. 425, Dec., 



1864. Neah Bay, Wash. 

 Siphonaria (Liriola) thersites DALL, Am. Journ. Conch., vi, pp. 32, 33, pi. 



iv, fig. 8, pi. v, figs. 2, 5, 1870. 



Range. Strait of Fuca to the Aleutian Islands, on stones near 

 low water mark. 



Xeah Bay, Wash. ! Victoria, British Columbia ; Fort Simpson, 

 British Columbia ; in Alaska at Port Mulgrave ! Port Etches ! St. 

 Paul. Kadiak ! Chirikof Island ! Semidi Islands ! Simeonof Island 

 and Popof Strait, Shumagin Islands ! Chika Islands, Unalga Pass ! 

 Captains Harbor, Unalaska ! Constantine Harbor, Amchitka ! Kiska 

 Harbor, Kiska Island, Aleutians. 



This is one of the most common and characteristic mollusks of the 

 northwest coast. It lives between tidemarks, often where it must be 

 submerged twenty out of twenty-four hours of the day, but is some- 

 times dredged in 20 fathoms, dead. 



