ARNOLD — THE PALEONTOLOGY AND STRATIGRAl'Il Y OK SAN TEDRO. 193 



Family XLIV. BLLl.lD.'E. 

 Genus Bulla Linnc. 



Shell oval-}^lubular, smooth, spotted, marbled, or zoned; spire concave, umbiiicatetl; apcr- 

 lurc as lonj; as tiie shell; inner marjjiii without columella; outer lip trenchant. 



Bulla ampulla Liiiii. is a cliariicteristic species. 



152. Bulla punctulata A. Ailams. 



Bulla piinctulata h.. Au., Thes. Conch., Vol. II, ]). 604. Cpk., Froc. Zool. Soc, 1863, p. 359. 



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

 Bulla punclala A. Au., Thes. Conch., Vol. II, p. 577, PI. CXXIII, fig. 77; not of Schkoeter. 

 Bulla adamsii Menke, Zeit f. Mol., p. 162, 1850. Cooper, 7th Ann. Re|)t. Cal.St. Min.,i8SS, p. 230. 



Slull cifnudium size, subglolnilar, thin; s|)ire lacking;; apcrluie lull length of shell, broadly 

 t)vate in Iront, narrowed posteriorly; outer lip thin, simple, gradually rounded near lunbilicus; inner 

 li|) and Columella incrusted; umbilical pit at posterior end, deep, effuse. 



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



'Plio shell described was an average .specimen, some of tlu; shells hci tig larger 

 aiul some much smaller. Specimens identified by Dr. Dall. 



This species is dislingnisliable from />'. whuhmi by its longer, narrower, more 

 I'vliudrieal body-whorl. B. punctulata is a southern shell, and is found but rarely 

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



Rather common in the upper San I'edro series of Deadman Island, Los 

 <"erritos, Crawfish ( Jeorge's, ami San Pedro. 



Living. — San Pedro to Panama (Cooper). 



Pleidocene. — San Pedro (Cooper; Arnold). 



Pliocene. — San Fernando (Cooper). 



153. Bulla quoyi Grai/. 



Pl.ATK VIII, FiC. S. 



Bulla (juoyi Gka\', Trav. in New Zealand, Dieffenbach, Vol. 1, p. 243, No. 113. Ci'K., Brit. Assn. 

 Rept., 1863, p. 646. 



-Shell small, elli[)tical; a[)erture 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 (juoiji by Dr. 

 Dall. Distinguishable from 1>. pH}Lctulnta by angulation of outer lip near posterior 

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



Rare in u])per San Pedro series of San Pedro; one young spccinuii found, 

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



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



Pleistocene. — San Pedro (Arnold). 



( 25 ) ilarcb IJ, l;ii]3. 



