ARNOLD — THE PALEONTUIAHJY AND STRATIGRAPHY OF SAN PEDRO". 193 



Family WAV. UULLID.K. 

 Gouus Bulla Linnc. 



Shell oval-globular, smooth, spotted, maibled, or zonetl; spire concave, iimhilicated; aper- 

 ture as long as the shell; inner margin without columella; outer lip trenchant. 



Bulla ampiiUa Liun. is a cliaracteristic rfpecics. 



152. Bulla punctulata ^1. Adams. 



Bulla ptindulata h. Ad., Thes. Conch., Vol. II, p. 604. Cpk., Proc. Zool. Soc. , 1863, p. 359. 



Tryon, Man. Conch., Vol. XV, PI. 37, fig. 39; PI. XXXVI, figs. 29, 30, 1893. 

 Bullapunctata A. Au., Thes. Conch., Vol. II, p. 577, PI. CXXIII, fig. 77; not of Schroeter. 

 Bulla adamsii Menke, Zeit f. Mol., p. 162, 1850. Cooper, 7th Ann. Rept. Cal.St. Min.,1888, p. 230. 



Shell of medium size, subglobular, thin; spire lacking; aperture full length of shell, broadly 

 ovate in front, narrowed posteriorly; outer lip thin, simple, gradually rounded near umbilicus; inner 

 lip and columella incrusted; umbilical pit at posterior end, deep, effuse. 



Dimensions. — Long. 32 mm.; alt. 23 mm.; aperture 32 mm. 



The shell described was an average specimen, some of the shells being larger 

 and some much smaller. Sjiecimens identified by Dr. Dall. 



This species is distingtiishable from B. ncbulo&a by its longer, narrower, more 

 cylindrical body-whorl. B. punctulata is a southern shell, and is found but rarely 

 as far north as San Diego. B. nebulosa is the common form now living at San Pedro. 



llather common in the upper San Pedro series of Deadman Island, Los 

 Cerritos, Crawfish George's, and San Pedro. 



Living.— ^nn Pedro to Panama (Cooper). 



Pleistocene. — Sau Pedro (Cooper; Arnold). 



Pliocene. — San Fernando (Cooper). 



153. Bulla quoyi Graj. 



Pi.ATK VIII, Fig. 8. 



Bulla ^uoji Gray, Trav. in New Zealand, Dieffenbach, Vol. 1, p. 243, No. 113. Cpr., Brit. Assn. 

 Rept., 1863, p. 646. 



Shell small, elliptical; aperture extending full length of shell; ovate in front, somewhat 

 narrowed behind; outer lip thin, angulated at posterior end; umbilicus at posterior end deep, not 

 very effuse; columella incrusted, the incrustation covering the anterior umbilical region. 



Dimensions. — Long. 8 mm.; alt. 5 mm.; aperture 8 mm. 



The specimen described is a young shell. Identified as Bulla quoijl by Dr. 

 r)all. Distinguishable from B. j^unctulnta by angulation of outer lip near posterior 

 umbilicus, and the much sharper curve of the anterior lip. 



Rare in upper San Pedro series of San Pedro; one young specimen found, 

 which is figured, and is now in the collection of Delos Arnold. 



Living. — Santa Barbara to Lower California (Carpenter). 



Pleistocene. — Sau Pedro (Ainold). 



( 55 , ilarcli 1^, 1UII3. 



