ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 299 



Family LXXI. VEUMETID/E. 



Genus Serpulorbis Sa^si. 

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

 Serpulorbis arenaria Qiioy. is a characteristic species. 



327. Serpulorbis squamigerus Carpenter. 



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



Serpulorbis sguamigents 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 squamigerus Cpr., Tryon, Man. Conch., Vol. \'III, p. iSi, 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 

 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), sj). 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 spirorhis Dillw. is a characteristic species. 



329. Spiroglyphus lituella March. 



Sip/ionium {Dendropomd) lituella MoRCH., Proc. Zool. Soc, 1861, p. 154. 



Spiroglyphus lituella .Mokch., 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 lirula and arcuate striae, which are appro.ximately regular; 

 aperture circular. 



Dimensions. — Diameter of coil 1.5 mm. 



