ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 197 



159. Melampus olivaceus Carpnnter. 



A/('/amfi7is o/ivaccus Ctr., Mazatlan Cat., No. 235: Brit Assn. Rept., 1863, p. 647. Cooper, 7th 

 Ann. Rept. Cal. St. Min., 188S, p. 250. Keep, West Coast Shells, p. 124, fig. 113, 

 1892. Williamson, Proc. U. vS. Nat. Mus., Vol. XV, 1892, p. 196. 



Shell small, thin, pyriform; spire solid, conical, barely elevated; whorls four or five, flat; 

 body-whorl comprises most of shell, slightly angulated above; suture appressed, wavy; aperture 

 long, narrow, rounded anteriorly; outer lip thin; inner lip incrusted, and with one prominent plica- 

 tion, and sometimes one or two more smaller ones; one prominent plication on columella; umbilicus 

 subperforate. 



D/mensi'ons. — Long. 12 mm.; lat. 9 mm.; aperture 9.5 mm. 



Somewhat resemble8 a small, thin, depressed Conus calif ornicus. 

 Found in all of the lower and upper San Pedro localities. Also found in the 

 Pleistocene at Twenty-sixth Street, San Diego. 



Living. — Salinas River to Mazatlan (Cooper). 



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



Pliocene. — San Diego well (Dall). 



Superfamily PETROPHILA. 

 Family XLIX. GADINIIDiE. 



Genus Gadinia Gray. 



Shell obliquely conical; muscular impression horseshoe-shaped, the right side shortest, 

 terminating at the siphonal groove. 



Gadinia afra Gray is a characteristic species. 



160. Gadinia reticulata SoiverJiij. 



Mourctia rctinilaia Sby., Proc. Zoo). Soc, 1835, p. 6. 



Gadinia reticulala Sby., H. & A. Adams, Gen. Rec. Moll., Vol. I, p. 463, 1853. Cpr., Brit. Assn. 



Rept., 1863, p. 666. Dall, Am. Jour. Conch., Vol. VI, i87i,p. 11, PL II, figs, i to 9; 



PI. IV, figs. I, 2 and 3. Keep, West Coast Shells, p. 98, fig. 83, 1892. Williamson, 



Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 196. 

 Rowellia sp. Cpr., Brit. Assn. Rept., 1863, p. 651. 

 Gadinia (Rowellia) radiata Cooper, Gabb, Proc. Cal. Acad. Sci., Vol. Ill, 1865, p. 188. Cooper, 



Geogr. Catal. Moll., p. 24, No. 460, 1867. 

 Rowellia radiqla Cooper, Am. Jour. Conch., Vol. VI, 1S71, p. 319. 

 Gadinia radiala Cooper, Dall, Am. Jour. Conch., Vol. VII, 1S72, p. 192. 

 Gadi?iia reticulata van radiata Cooper, Bull. No. 4, Cal. St. Min. Bureau, 1894, p. 26. 



Shell conical; apex central, smooth, blunt; surface sculptured by numerous rounded, 

 radiating ridges, made somewhat nodose by concentric, elevated lines of growth; aperture slightly 

 ovate; inner surface smooth; lip smooth, effuse; color white. 



Dime7isions. — Long. 15 mm.; lat. 14 mm.; alt. 5 mm. 



Somewhat resembles Acmcea mitra, but is more depressed, has a le.ss acute 

 apex, and is sculptured radially. One specimen found in upper San Pedro series of 

 San Pedro. 



