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21:0154 Alectrion miser Dall, 1890. Acapulco to Panama, 
21:0155 Alectrion exsarcus Dall, 1908. Galapagos Islands 
21:0156 Alectrion goniopleura Dall, 1908. Galapagos Islands. 
21:0157 Alectrion townsendi Dall, 1908, Galapagos Islands. 
21:0158 Alectrion tschudii Troschel, 1852. Cedros Island; Peru. 
21:0159 Alectrion moestus Hinds, 1944. Gulf Cal.; Chile. 
Nassa brunneostoma Stearns, 1893, is a Synonym. 
21:0160 Alectrion versicolor C. B. Adams, 1852, 
Magdalena bay, Baja Cal. to Payta, Peru. 
21:0161 Alectrion nodicinctus A. Adams, 1851. 
San Diego, Cal., to Panama; Galapagos Islands. Description 
not seen. 
21:0162 Alectrion escalae Philippi, 1860. Chile. 
21:0163 Alectrion catallus Dall, 1908. 
Dredged from off San Miguel Island, Cal., to Gulf of Panama. 
21:0164 Alectrion insculptus Cpr., 1863, non Cooper, 1888. 
Point Arenas, Cal., to Cedros Island, Baja Cal.; also in the 
Pleistocene. A rare and elegant species; shell thick, solid, 22 
mm. long, outer lip strongly reflected, no transverse sculpture 
except on first few whorls, color light brown, aperture white. 
21:0165 Alectrion insculptus eupleura Dall. 
In this form the axial ribs, which in the type are only indi- 
cated at the suture, are prolonged over the periphery of the 
whorl to the base. San Simeon, Cal., to Cedros Island, Baja, Cal. 
21:0166 Alectrion taeniolatus Philippi, 1845. Acapulco to Chile. 
21:0167 Alectrion limacina Dall. Gulf of Cal. 
21:0168 Alectrion onchodes Dall. Off Cedros Island; Panama. 
21:0169 Alectrion polistes Dall. Panama Bay; Peru. 
21:0170 AROULARIA Link. 
Body whorl gibbous on the back; spire produced; callus of 
inner lip greatly extended and covering the spire. Nassa in part. 
21:0171 Arcularia luteostoma Brod. & Sby., 1829. Gulf Cal.; 
Chile. 
Synonymy:——Nassa Xxanthostoma Gray, 1839. 
21:0172 Arcularia tiarula Kiener, 1834. Cape San Lucas; Pan- 
ama. 
21:0173 Arcularia nodulifera Philippi, in Cpr., 1857. 
Strongly spirally suleate, usually dark igray with a rude 
surface; hitherto generally regarded as a form of tegula. San 
Diego, Cal. to Gulf of California. 
21:0174 Arcularia tegula Reeve, 1853. §. Francisco to San 
Diego, Cal. 
The large dark colored form. 
