ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 243 



Family TAT. MURTCID.E. 



Genus Murex Linne. 



Shell ovate or oblong; spire prominent; whorls convex, crossed by three or more con- 

 tinuous varices; aperture ending below in a canal, which is generally partly closed. 



Murex tenuispena Lam. is a characteristic species. 



Subgenus Chicoreus Mont fort. 



Shell ovate-pyriform; varices foliated and sometimes spinose; canal short, curved, wide, 

 nearly closed. 



Murex adustus Lam. is a cliaracteristic species. 



238. Murex (Chicoreus) leeanus D<(U. 



Platf. VII, Fig. 1. 



A/urex (Chicoreus) leearius Dall, Proc. U. vS. Nat. Mus., Vol. XII, 1890, p. 329, PI. VII, fig. i. 



Shell large, strong, angular in outline; apex sharp; whorls five or six, angular, flat to con- 

 cave above; each whorl ornamented with three varices, which e.xtend out into long, rather sharp 

 spines; the varices toward the apex fall short of completing a whole whorl, so that they are slightly 

 spirally arranged; a faint node on angle between each pair of varices; surface sculptured with delicate 

 squamose, spiral cinguli, with chiseled grooves between; suture deeply impressed, wavy; aperture 

 elliptical; outer lip smooth; inner lip slightly projecting, smooth; canal long, narrow, slightly curved, 

 covered; older termini of canal visible on pillar at left of canal. 



Dimensions. — Long. 55 mm.; lat. 43 mm.; body-whorl 47 mm.; aperture 17 mm. 



A large, showy shell, easily distinguishable by the long, sharp varical spines. 

 Specimens identified by Dr. Dall. 



Rare in upper San Pedro series at San Pedro and Crawfish George's. The 

 drawing of this si)ecies is a composite, and was made from two imperfect specimens 

 from the upper San Pedro series at San Pedro, which are now in the collection of 

 Delos Arnold. 



Xii'in^.-^Cerros Island, off Lower California (Dall). 



Pleistocene. — San Pedro (Arnold). 



239. Murex (Chicoreus?) trialatus Sowerby. 



Murex trialalus Sbv., Proc. Zool. Soc, 1840, p. 143. Tryon, Man. Conch., Vol. II, p. 113, 



PI. XXXIV, fig. 372, 1880. 

 Murex califoriiicus Hds., Proc. Zool. Soc, 1843, p. 128. Voyage Sulphur, PI. Ill, figs. 9 and 10, 



1844. Tryon, Man. Conch., Vol. II, p. 113, PI. XXXIV, fig. 375: PI. XXXV, 



fig. 287, 1880. 

 Muricidea californica Hds., Cpr., Brit. Assn. Rept., 1863, p. 663. Gabb, Pal. Cal., V^ol. II, 



p. 69, 1869. 



Shell small, fusiform; spire elevated, subacute; whorls five, convex; body- whorl over three- 

 fourths length of shell; varices three, thick and rounded, elevated on angle of whorl to sharp, 



