ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 299 



Family LXXI. VEEMETIDiE. 

 Genus Serpulorbis Sassi. 

 Shell tubular, irregularly twisted, adherent; aperture rounded ; columella not plicate. 

 Serpulorbis arenaria Quoy. is a characteristic species. 



327. Serpulorbis squamigerus Carpenter. 



Aleles squamigerus Cpr., Proc. Zool. Soc. , 1856, p. 226. 



Serpulorbis squamigerus Cpr., Brit. Assn. Rept. , 1863, p. 654. Cooper, 7th Ann. Rept. Cal. St. 



Min., 1888, p. 264. Keep, West Coast Shells, p. 74, 1892. Williamson, Proc. U. S. Nat. 



Mus., Vol. XV, 1892, p. 204. 

 Vermetus squatnigerus CpR., Tryon, Man. Conch., Vol. VIII, p. 181, PI. LIV, figs. 73, 74, 1886. 



Shell tubular, irregularly twisted, adherent; surface may be transversely or longitudinally 

 ornamented, generally, however, only showing circular incremental lines; aperture circular. 

 Dimensio7is. — Diameter from 2 mm. to 15 mm. 



In some cases found attached to rocks in conglomerate, in others found in 

 irregular aggregates or individual sections. 



Common in the upper San Pedro series of San Pedro and vicinity; rare in 

 the lower San Pedro series of Deadman Island and San Pedro. Found in the 

 Pleistocene at Pacific Beach, San Diego. 



Living. — Monterey to San Diego (Cooper). 



Pleistocene. — Santa Barbara to San Diego (Cooper): San Pedro; San Diego 

 (Arnold). 



Subgenus Vermicularia Lamarck. 



328. Serpulorbis (Vermicularia), sp. indet. 



One small nepionic shell of a species of this genus was found in the lower 

 San Pedro series of San Pedro. Specimen identified by Dr. Dall. 



Pleistocene. — San Pedro (Arnold). 



Genus Spiroglyphus Daudin. 



Animal forming a groove on the surface of shells or stones, covering it over with shelly 

 matter, and forming a tubular case. 



Spiroglyphus sj)i7'orbis Dillw. is a characteristic species. 



329. Spiroglyphus lituella Morch. 



Siphoniuni {Dendropoma') lituella Morch., Proc. Zool. Soc, 1861, p. 154. 



Spiroglyphus lituella Morch., Cpr., Brit. Assn. Rept., 1863, p. 654. Keep, West Coast Shells, 

 p. 73, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 204. 



Shell small, irregularly and sometimes openly spiral, rather compressed; color dingy white; 

 surface sculptured by incremental lirulai and arcuate striae, which are approximately regular; 

 aperture circular. 



Dimensiotts. — Diameter of coil 1.5 mm. 



