AUNOLD — Tlir, PAI.KONTOI.OOY AND STUATIORAPIIY OK SAN PEDHO. 321 



I'amily l,.\X.\ll. PHASIANELLID^K. 

 (uiius Phasianella Lamarck. 



SIrU elongated, polished, richly cdlmed; whnils convex; aperture oval, not pearly; inner lip 

 callous; outer li|) thin; (i])(i('uhim slu-lly ; callous outside, subspiral inside. 



Phasianella fulimoides Lam. is a cliaracteristic species. 



365. Phasianella compta (hndd. 



Phasianella compta Gi.n., Pac. R. K. kept., X'ol. \'l, p. _:;33, I'l. XI, figs. 25, 26, 1857. Cpr., Brit. 

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

 Vol. X, p. 173, PI. XXXIX, figs. 69-72, 1888. Cooper, 7th Ann. Rept. Cal. St. 

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

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



Shell small, thin; .spire elevated; ape.K subacute; whorls four, evenly convex; 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. 



I^istingiiislial)lc from tlu' gciui.s Lacuna by lack of distinct umbilical chink, 

 and by the spiral lines. These lines are slij^htly oblicpie and slope anteriorly from 

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

 irregular, transverse, piir[)lo lines. 



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

 the lower San Pedro series at Han I'etlro and Deadraan Island. Found also in the 

 Pleistocene at Twenty-sixth Street, San Diego. 



Liviny. — 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. 0[)erculum oval, subquadrangular, externally convex. 



Pachypoma cadata Chem. is a characteristic species. 

 366. Pachypoma incequale Martyn. 



Trochus incEqiialis Mart., Univ. Conch., Lonci., 1784. 



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



fiRS- I. 3. 5- 

 Trochus gibbe/osHS Chem., Conch. Cab., X, p. 278, vign. 23, 1795. 

 Pachypoma gibberosum 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. 

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



May 4. \Wi. 

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