1896.] NATURAL SCIENCES OF PHILADELPHIA. 453 



Pedipes angulatus C. B. Adams. 



Pedipes angiilata C. B. Adams, Pan. Shells, Ann. Lye Nat. Hist., N. Y., V, 

 pp. 431, 542, 1852. 



Pedipes angulatiis Pfeiffer, Novit. Conch., I, p. 24, t. 6, figs. 26-28, 1854; 

 Wimmer, op. cit., p. 45, 1879. 



Panama, Adams ; Bindloe Island, Galapagos, Habel, fide Wim- 

 mer. 



Genus SIPHONARIA Sowerby.12 



Siphonaria gigas Sowerby. 



Stp/ionaria gigas Sowerhy, Tank. Cat., p. vi. No. 808, 1825; Keeve, Conch. 

 Icon., S/p/ionarza, pi. 1, fig. 3. 



SipAonaria characterhtica Reeve, op. cit., pi. 2, figs. 8 a-b. 



Charles Island, U. S. Fish Commission ; Peru, Coeos Island, Pan- 

 ama and north to the Gulf of California. 



Genus WILLIAMIA Monterosato. 



Ancylus sp. ( Gussoni) Costa, Cat., p. 20, 1829; Scacchi, Cat., p. 18, 1836. 



Patella sp. Phil., Enum. Moll. Sicil., I, p. 255, 1836; II, p. 84, 1844. 



Nacella sp. Cpr., Ann. Mag. Nat. Hist., 1864, I, p. 474, No. 15; Cooper, 

 Geogr. Cat. Moll., Gala., p. 23, 1867. 



Siphonaria {Liriola) sp. Dall, Am. Journ. Conch., VI, p. 37, 1870. 



Pilisats subg. Allerya Morch, Journ. de Conchyl., Vol. XXV, p. 210, 1877. 

 Not Allerya Bourguignat, Atti Accad. Sci. Let. ed. Arti. di Palermo, VI, pp. 

 1-7, 1876. 



Scutulnm Monterosato, Ann. Mus. Civ., Genova, IX, p. 427, 1877. 



Not Sciitulum Tournouer, Bull. Soc. Geol. de France, 1869 {Echinidce). 



Liriola sp. Dall, Journ. de Conchyl., XXVI, p. 68, 1878. 



Anisomyon ? Dall, Journ. de Conchyl., XXVII, p. 287, 1879 ; (? Meek. Am, 

 Journ. Sci. & Arts, 2, XXIX, p. 33, pi. 1, 1860). _ 



Gadinia sp. Jeflfreys, Ann. Mag. Nat. Hist., 1870, p. 11. 



Williamia Monterosato, Nom. Conch. Medit., p. 150, 1884. 



Umbrella sp. Cossmann, Cat. Coq. Fos. env. Paris, IV, p. 326, 1891. 



Parascutuju Cossmann, Cat. Coq. Fos. env. Paris, V, p. 78, 1892. 



Type W. Gussoni (Costa) of the Mediterranean and Azores; 

 other species are the W. Krebsii Morch, West Indies, W. vernalis 

 Dall, Monterey, Cala., W. peltoides Cpr., of the Gulf of California 

 and south to the Galapagos. 



The synonymy of this interesting little genus of Sip ho7iariid(E had 

 become so complicated that it seemed best to take this opportunity 

 of clearing it up. The wide distribution of the species is partly due 

 to their habit of perching on floating sea-weeds. 



12 Siphonaria saitelltan Deshayes, was referred to the Galapagos Islands by 

 Carpenter, owing to a confusion between its true locality, Chatham Island. New 

 Zealand, with the Galapagos Chatham Island. This species according to 

 Deshayes is identical with S. obliquata Sby. described sixteen years earlier in 

 the Tankerville Catalogue. 



