108 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



2. Ensis minor Dall; Cape May to Florida and Texas. 



This is Solon ensis var. minor of some of the earlier writers, and bears 

 to -E/. directus the same relation that Ensis ensis Linnsens of Europe 

 does to the north European E. magnus Schumacher. It differs from 

 the young of E. directus in having the valves wider behind than in 

 front and relatively narrower as a whole. 



Genus SILIQUA Megerle, 1811. 



(Leguminaria Schumacher, 1817; + soleonrtus A Blainville, 1825; + Atilus Oken, 

 1835, not Oken 1815; -|- Soleoiirtoicles Desmoulins, 1832; + Solenocurtus 

 Sowerhy, 1839; + Maclwcra Gould, 1841.) Type, Solen radiatus Linna?,us. 



1. Siliqua squama Blainville, 1824; G-rand Banks of ^Newfoundland 

 and Gulf of St. Lawrence. 



This is Macluera nitida Gould, 1841, and Cultellus medius Sowerby 

 (not Gray), Conch. Icon., 1874. 



2. Siliqua costata Say, 1822; Gulf of St. Lawrence south to Cape 

 Hatteras, North Carolina, in suitable localities. 



The following are synonymous names : tSolecurtoides naliantensis Des- 

 moulins, 1832; 8. sayi Gray, 1833; S. radiatus Ravenel (not Linnseus), 

 1834; Cultellus grayanus Sowerby (not Duuker?), 1874; Cultellus sub- 

 sulcatus Sowerby, 1874; Cultellus helcheri (as of Gray, manuscript) 

 Sowerby, 1874; not C. costatus Middendorf, 1847, nor Sowerby, 1874. 



Genus PSAMMOSOLEN Risso, 1826. 



(=: Psammohia Kisso, 1826, err. typ. ; + Solecurtus B, Blainville, 1825; + Macha 

 Oken, 1835; + Adasius Leach, 1852; not Macha Philijjpi, 1853, nor Psam- 

 mosolen Hup6, 1854.) Type, Solen strigilatus Linna'us. 



1. Psammosolen sanctw-marthw (Chemnitz) Orbigny, 1853; North 

 Carolina, Bermuda, the Antilles, and south to Rio Janeiro (Dunlap). 



2. Psammosolen cumingiamis Dunker, 1861 ; North Carolina, to Texas 

 and Sao Paulo, Brazil. 



WEST AMEEICAN SPECIES. 



Genus SOLEN (Linnaeus) Scopoli. 



1. Solen sicarius Gould, 1850; Vancouver Island to San Pedro, Cali- 

 fornia; Japan, A. Adams (?). 



2. Solen rosacens Carpenter, 1883; Santa Barbara, California, south 

 to the Gulf of California; La Paz. 



3. Solen mexicanus Dall; west coast of Tehuantepec, Mexico. 



4. Solen {Solena) rudis C. B. Adams, 1852; Panama. 

 Confounded with S. ohliquus Speugler of the Antilles by Carpenter 



and Sowerby. 



Genus ENSIS Schumacher. 



1. Ensis californicus Dall; Monterey, California, south to the Gulf of 

 California; La Paz. 



