AKNOLD — THE PALEONTOLOGY AND STKATIGKAPHY OF SAN TEDKO. 193 



Family XLIV. BULLION. 



Genus Bulla Linne. 



Shell oval-globular, smooth, spotted, marbled, or zoned; spire concave, umbilicated; aper- 

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



Bulla ampulla Linn. i.s a characteristic species. 



152. Bulla punctulata ^4. Adams. 



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



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

 Bulla punctata A. Ad., 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., i888, 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, efifuse. 



Dimeusions. — 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. Specimens identified by Dr. Dall. 



This species is distinguishable from B. nehulosa 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. nebulosn is the common form now living at San Pech-o. 



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

 Cerritos, Crawfish George's, and San Pedro. 



Living. — San Pedro to Panama (Cooper). 



Pleistocene. — Sau Pedro (Cooper; Arnold). 



Pliocene. — San Fernando (Cooper). 



153. Bulla quoyi Gray. 



Plate VIII, FlQ. S. 



Bulla quoj'i Gray, Trav. in New Zealand, Diefi'enbach, Vol. I, p. 243, No. 113. Cpk., 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. 



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



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

 Dall. Distinguishable from B. punctulata 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, 

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



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



Pleistocene. — San Pedro (Arnold). 



( 25 ) ilarcb 12, VJU3. 



