262 CALIFORNIA ACADEMY OF SCIENCES. 



Fleistocem. — Santa Barbara; San Pedro; Ventura (Arnold). 

 Pliocene. — Santa Rosa; Kirker's Pass; San Fernando (Cooper): Stanford 

 University (Arnold). 



Subfamily CORALLIOPHILIN^. 



Genus Coralliophila H. tC- A. Adams. 



Shell broadly fusiform; nuclear whorls smooth; postnuclear whorls with rasp-like surface, 

 and somewhat open umbilicus. 



Coralliophila neritoidea is a characteristic species. 



272. Coralliophila nux Reeve. 



Murex nux RvE., Conch. Icon., sp. 81. 



Coralliophila nux RvE., Tryon, Man. Conch., Vol. II, p. 210, PI. LXVI, figs. 368, 374, 1880. 



Shell purpuroid shaped; whorls angular; surface rough and cancellated by spiral and trans- 

 verse squamose ridges, the spiral ridges being the most prominent; suture deep. Longitude about 

 12 millimeters. 



This specimen is too imperfect to allow of a good description. Dr. Dall 

 labeled this specimen "Corallio'pliila, probably var. of nux." 



One specimen from the upjier San Pedro series of San Pedro. 



Living. — Mazatlan to Panama; Gallapagos Islands (Tryon). 



Pleistocene. — San Pedro (Arnold). 



Suborder STREPTOD ON T A. 



Superfamily PTENOGLOSSA. 

 Family LXII. SCALIDyE. 



Genus Scala Hum^ihrey. 



Shell mostly pure white and lustrous; turreted, many whorled; whorls round, sometimes 

 separated, ornamented with numerous transverse ribs; aperture round; peristome continuous. 



Scala pretiosa Linn, is a characteristic species. 



