ARNOLD — THE PALEONTOLOGY AND 8TEATIGRAPHY OF SAN PEDRO. 337 



were found to bo recent shells from the kitchen-middens tiiat overlie all of the San 

 Pedro fossil deposits. The mistake of reporting kitchen-midden shells as " Pleisto- 

 cene " ami " Pliocene " has been made by a number of collectors, who have mis- 

 taken these accumulations for fossil deposits. The two species of Ifaliotls above 

 referred to, besides H. fnlrjena, n.rc common in many of the kitchen-middens along 

 the coast, and especially so in those around San Pedro. 



Living. — Monterey to Lower California (Carpenter). 



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



Family LXXXVII. FISSURELLIDiE. 

 Subfaiinly FISSURELLWKIX^. 



Genus Lucapina Graij. 



Shell oval-oblong, conic, depressed, cancellated; summit subcentral, the oval opening sur- 

 rounded by a callus; margin crenulated. 



Lucapina crenulata Sby. is a characteristic species. 



394. Lucapina crenulata Sowerby. 



Fissurella crc7iulata Sby., Tank. Catalogue, App., p. vi, 1825; Conch. 111., No. 19, tigs. 31, 38, 1831. 



Lucapina crenulata Sv.\ ., Cpr., Proc. Zool. Soc, 1856, p. 223. Cpr., Brit. Assn. Rept, 1863, p. 651. 

 Gabb, Pal. Cal. Vol. II, p. 85, 1869. Trvon, vStruct. and Syst. Conch., Vol. II, p. 326, 

 PI. LXXXIII, fig. 17, 1883. Trvon, Man. Conch., Vol. XII, PI. XLIV, figs. 95, 96, 

 1890. Keep, West Coast Shells, p. 95, fig. 79, 1892. Williamson, Proc. U. S. 

 Nat. Mus., Vol. XV, 1892, p. 198. 



Shell large, oval, conical, depressed; surface cancellated with numerous radiating ridges and 

 concentric incremental lines; summit subcentral, the oval opening surrounded by a callus; margin 

 crenulated. 



Dimensions. — Long. 90 mm.; lat. 57 mm.; alt. 20 mm. 



This species is distinguishable by its large size and rather faint scul[)ture. 

 Rare in the u[)i)er San Pedro series at Los Cerritos. 

 Living. — San Pedro to San Diego (Carpenter; Williamson). 

 Pleistocene.— S-dn Pedro (Arnold). 



Subfamily EMARGIKULIN^. 

 Genus Fissuridea Sivainson. 



Shell oval, conical, depressed, with the ape.\ in front of the center, and perforated by oblong 

 opening; surface radiated or cancellated; margin crenulated; callosity often truncate, sometimes 

 aminated. 



Fissuridea inceqiialis Sby. is a characteristic species. 



( « ) May 4. 1903. 



