576 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



Alectrion (Schizopyga) calif ornianus Conrad, 1856. This is fossata part Gabb, 

 not of Gould. It has been collected from Drakes Bay, north of San Francisco 

 to the San Ignacio lagoon, Lower California. 



Alectrion perpinguis Hinds, 1844. This is probably the same as Nassa interstriata 

 Conrad, 1856, from the Santa Barbara Pleistocene, and has even been reported 

 from the Miocene. Its known range is from Puget Sound to Cerros Island. 



Alectrion dentiferus Powys, 1835. Peru and Chile. 



Alectrion rubricatus Gould, 1849. Peru and Chile. 



Alectrion gayii Kiener, 1834. This is probably exilis Powys, 1835, and obscurus 

 Hup6 1854. Peru and Chile. 



Alectrion planicostatus A. Adams, 1851. Payta, Peru. 



Alectrion mendicus Gould, 1850. Nassa woodwardi Forbes, 1850, and gibbsi W. 

 Cooper, 1857, are synonymous. 



The species ranges from Kodiak Island, Alaska, to San Diego, California. It is 

 reported from the Pliocene and Pleistocene. 



Alectrion cooperi Forbes, 1850. Puget Sound and south to San Diego; also Plio- 

 cene and Pleistocene. I am inclined to think it distinct from viendicus, 

 though the latter sometimes has a few strong ribs. 



Alectrion cerritensis Arnold, 1903. Originally described fiom the Pleistocene of 

 Los Cerrltos, California. We also have it living from San Pedro to the Gulf of 

 California. The living specimens are not quite as large as some of the fossils, and 

 resemble yoimg specimens oifossatus, but are narrower. 



Alectrion pagoda Reeve, 1844. This is Bucdnum decussatum Kiener, 1834, but 

 not of Linnaeus, 1758. Nassa acuta CarfDcnter, 1857, and corpulenta C. B. Adams, 

 1852, are synonymous. It is known to range from the Gulf of California to Panama. 



Alectrion miser Dall, 1908. A rather deep water species, like a coarse, stumpy per- 

 pinguis, dredged from Acapulco to Panama, and usually eroded. 



Alectrion exsarcus Dall, 1908. In deep water off the Galapagos Islands. 



Alectrion goniopleura Dall, 1908. With the last. 



Alectrion townsendi Dall, 1908. With the two preceding species. 



Alectrion tschudii Troschel, 1852. From Cerros Island, Lower California, to Peru. 



Alectrion raoestus Hinds, 1844. This was named brunneostoma by Steams in 1893, 

 and ranges from the Gulf of California to Chile. 



Alectrion versicolor C. B. Adams, 1852. It ranges from Magdalena Bay, Lower 

 California, to Payta, Peru. 



Alectrion nodicinctus A. Adams, 1851. This species ranges from San Diego, Cali- 

 fornia, to Panama and the Galapagos. 



Alectrion escalae Philippi, 1860. This extremely pretty little species has been 

 collected at Antofagasta and Mejillones, Chile. 



Alectrion cataUus Dall, 1908. Dredged from off San Miguel Island, California, to 

 the Gulf of Panama. 



Alectrion tnsculptus Carpenter, 1863, not of Cooper, 1888. This elegant species 

 has been collected from Point Arena, California, to Cerros Island, and also from 

 the Pleistocene. 



Alectrion insculptus, new variety eupleura Dall. In this form the axial ribs, 

 which in the type are only indicated at the suture, are prolonged over the 

 periphery of the whorl to the base. It has been collected from San Simeon, Cali- 

 fornia, to Cerros Island. (Cat. No. 209046, U.S.N.M.) 

 Alectrion taeniolatus Philippi, 1845. Collected from Acapulco, Mexico, to 

 Guayaquil and Chile. A small reticulate species, white with two or three 

 brown snirals. one at the suture. 



