230 CALIKOKM.V ACADKMV l)r SCIENCKS. 



Pleistocene. — San Petlro to San Diego (Coopor) : San IVilro; Saii Diego 

 (Arnold). 



GiMius Macron //. .f- A. Adams. 



Slicll ovate, solid, with a thick i-piilcnnis; spire elevated; coliiinrlla wrinkled, with a callosity 

 at tiie upper part; outer lip thin, with a small tooth anteriorly. 



Type, Macron kelldtii A. Ads. 



216. Macron kellettii .1. Adainf^. 



Pseudoliva kellettii A. An., Prog. Zool. Soc, 1853, p. 185. 



Macrov kellettii h. An., Ci'R., Brit. As.sn. Rept., 1863, p. 664. Trvon, Man. Conch., Vol. Ill, 



p. 214, PI. LXXXII, fig. 477, 1S81. Keep, West Coast Shells, p. 21, 1892. Cooper, 



Bull. No. 4, Cal. St. Min. Bureau, Part 3, 1894, p. 27. 



Shell ovate, solid, subperforate; spire prominent; whorls rounded; suture canal-like; last 

 whorl spirally sulcated; aperture oval ; columella callous posteriorly, anterior portion produced and 

 flexed; posterior part of lip bent, anterior part dentate. Canal a mere notch. Average length 

 about 25 mm. 



One specimen in upper Ran Pedro series of San Pedro. 



Living. — Lower California (Keep): Cataliiia I.sland to Lower California 

 (Cooper). 



Pleistocene. — San Pedro (Arnold): San Joaqnin IJay, Orange Comity (Bowers). 



Pliocene. — Ventura County (Bowers). 



217. Macron lividus A. Adamf^. 



Macron lividus A. An., Cpr., Brit. Assn. Rept.. 1863, p. 664. Keep, West Coast Shells, p. 20, 

 fig. 2, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 216. 



Shell small, ovate, solid; spire elevated; apex subacute; whorls five, evenly convex, smooth; 

 suture distinct; aperture ovate; outer lip sharp and curved; inner lip short and bent; columella with 

 a strong fold near the top of the aperture. 



Dimensions. — Long. 19 mm.; lat. 10 mm.; body-whorl 14 mm.; aperture 10 mm. 



This species is characterized by its smooth surface and small size. One 

 specimen found in the upjier San Pedro series at the lumber yard, San Pedro. 



Living. — San Pedro (Williamson) : San Diego to Lower California (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



Family LLX. NASSIDyE. 



Genus Nassa Lamarck. 



Shell ovate, ventricose; body-whorl variously sculptured; aperture ovate, with a short, reflected, 

 truncated, anterior canal; inner lip smooth; often widely spread over with enamel, with a posterior 

 callosity or a blunt dentiform; outer lip dentated, internally crenulated. 



Nassa mutahilis Linn, is a characteristic species. 



