ARNOLD — THK PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 321 



Family I.XXXII. I'il ASIANELLID.E. 



Genus Phasianella Lavuirck. 



Shell elongated, polished, richly colored; whorls convex; aperture oval, not pearly; inner lip 

 callous; outer lip thin; operculum shelly; callous outside, subspiral inside. 



I^hasiauella fulimoides Lam. is a characteristic species. 



365. Phasianella compta Gould. 



Phasianella comfyfa Gld., Pac. R. R. Rept., Vol. VI, p. 333, PI. XI, figs. 25, 26, 1857. Cpr., Brit. 

 Assn. Rept., 1863, p. 651. Gabb, Pal. Cal., Vol. II, p. 82, 1869. Tryon, Man. Conch., 

 Vol. X, p. 173, PI. XXXIX, figs. 69-72, i888. Cooper, 7th Ann. Rept. Cal. St. 

 Min., 1888, p. 25S. Keep, West Coast Shells, p. 89, fig. 74, 1892. Williamson, 

 Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 199. 



Shell small, thin; spire elevated; apex subacute; whorls four, evenly conve.x; ornamenta- 

 tion consists of eight obsolete spiral ridges crossed by numerous fine oblique, incremental lines; 

 suture depressed, distinct; aperture ovate; outer lip thin; inner lip sharp and effuse, with incrustation 

 extending to umbilical region; a narrow umbilical chink is sometimes present. 



Dimensions. — Long. 9.5 mm.; lat. 6 mm.; body-whorl 7 mm.; aperture 4.2 mm. x 2.8 mm.; 

 defl. 45 degrees. 



Distinguishable from the genus Lacuna by lack of distinct umbilical chink, 

 and by the spiral lines. These lines are slightl}' oblique and slope anteriorly from 

 the top of the whorl. The Pleistocene shells often retain their coloration of zigzag, 

 irregular, transverse, purple lines. 



This species is common in the upper San Pedro series of San Pedro; and in 

 tlie lower San Pedro series at San Pedro and Deadraan Island. Found also in the 

 Pleistocene at Twenty-sixth Street, San Diego. 



Living. — San Pedro to Mazatlan (Cooper). 



Pleistocene. — San Pedro; San Diego (Cooper; Arnold). 



Family LXXXIII. TURBINID/E. 



Genus Pachypoma Gray. 



Shell trochiform, conical, with moderately elevated spire; base concave, not umbilicated; 

 whorls flattened, rugose, spinously fringed. Operculum oval, subquadrangular, externally convex. 



Pachypoma crelata Chem. is a characteristic species. 

 366. Pachypoma inaequale Martyn. 



Trochus inaqualis Mart., Univ. Conch., Lond., 1784. 



Pachypoma inaquale Mart., Dall, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 199, PI. XXIII, 



figs. I, 3, 5- 

 Trochus gibberosus Chem., Conch. Cab., X, p. 278, vign. 23, 1795. 

 Pachypoma gibberosuni Chem., Cpr., Brit. Assn. Rept., 1863, p. 651. Gabb, Pal. Cal., Vol. II, 



p. 83, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 256. Keep, West Coast 



Shells, p. 87, 1892. 

 Astralium inaquale Mart., Tryon, Man. Conch., Vol. X, p. 244, PI. LVII, figs. 51, 52, 1888. 



May 4, 190:). 



