AliNOLD — THE PALEONTOLOGY AND STKATIGKAl'HV OF SAN I'EDKO. 299 



Family LXXI. VEKMETIDiE. 

 Genus Serpulorbis Sassi. 

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

 Serpulorhis 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, 7tli 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 squamigerus Cpr., Tryon, Man. Conch., Vol. \'I1I, 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. 

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



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

 irreguhir aggregates or individual sections. 



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

 the lower San Pedro series of Deadraan Island and San Pedro. Fouiul in the 

 Plei-stocene at Pacific Beach, San Diego. 



Living. — Monterey to San Diego (Cooper). 



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

 (Arnold). 



Subgenus Vermicularia Lamarck. 



328. Serpulorbis (Vermicularia), sp. iiulet. 



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 spirorhis Dillw. is a characteristic species. 



329. Spiroglyphus lituella March. 



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



Spiroglyphus lituella MoRCH., Cpr., Brit. Assn. Rept., 1S63, 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 liruhe and arcuate striae, which are appro.ximately regular; 

 aperture circular. 



Dimensions. — Diameter of coil 1.5 mm. 



