ARNOLD — THE PALEONTOLOOV AND STUATlGRAI'H V OK SAN I'EDRO. 323 



368. Leptothyra bacula Carpenter. 



Lfplonvx baiu/a CpR., Brit. Assn. Rtpt., 1863, p. 652. Krep, West Coast Shells, p. 87, 1892. 

 Lfplothyra bacula Cpr., Gaub, Pal. Cal., Vol. II, p. 85, 1869. Coopkr. yih Ann. Rept. Cal. St. 

 Min., 18S8, p. 245. Williamson, Proc. U. S. Nat. Mus., X'ol. XV, 1S92. p. 199 



Shell small, turreted, thick; surface sculptiiied by fine spiral lines; no nnihilicus; aperture 

 circular, slightly angulated anteriorly. 



Dimensions. — Alt. 2 mm.; lat. 2.5 mm. 



Tlio specimen fi'om tlie Pleistocene shows the original pink color of the living 

 shell, and looks very much like a very small Xorii^^ia norridi, except that the Lep- 

 tothyrn has no umhiliciis. 



Distinguishable from L. cnrpenteri awiX L. paiicicostata by its much liner spiral 

 sculpture and pinkish color. 



One specimen from the lower San Pedro series of Deadman Island; also 

 found in the lower San Pedro series at Los Cerritos. Found in the Pleistocene at 

 bath-house, Santa Barbara. 



Living. — Monterey to Catalina Island (Cooper). 



Pleistocene. — Santa Barbara to San Pedro (Cooper): San Pedro; Santa Bar- 

 bara (Arnold). 



369. Leptothyra carpenteri Pilshry. 



Leptothyra carpenteri Pilsbrv, Trvon, Man. Conch., Vol. X, p. 247, PI. XXXIX a, figs. 26-29, 

 1888; Nautilus, July, 1890. Williamson, Proc. U, S. Nat. Mus., Vol. XV, 1892, p. 199. 



Leptothyra sanguineus Linn., Cpk., Brit. Assn. Rept., 1863, p. 652. 



Leptothyra sanguinea Cpr., Gabb, Pal. Cal., Vol. II, p. 85. 1869. Tryon, Syst. Conch., Vol. I, 

 PI. II, p. 312, 1882. Cooper, 7th Ann. Rept. Cal. St. Min., p. 245, 188S. (Not 

 Leptothyra sanguineus Linn., Syst. Nat., 1760.) 



Leptonyx sanguinea LiNN., Keep, West Coast Shells, p. 87, fig. 73, 1892. 



Shell small, subconical, thick; spire only slightly elevated; whorls three to four, slightly 

 convex; body-whorl subangulate anteriorly; whorls ornamented by nine to ten fine, spiral ridges; 

 aperture circular; not umbilicated; tubercle on lower portion of outer lip; suture slightly im- 

 pressed, distinct. 



Dimensions. — Alt. 8 mm.; lat. 10 mm. ; defl. 100 degrees. 



Distinguishable from L. paucicostaia by larger size, greater number and less 

 prominence of si)iral ridges, and by less prominence of suture; distinguishable from 

 L. bdcida by less number and greater prominence of spiral ridges. 



Found in lower San Pedro series at Deadman Island, and San Pedro; and 

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



Living. — Straits of Fuca to San Diego; Japan (Cooper). 



Pleistocene. — Santa Barbara (Cooper): San Pedro (Arnold). 



370. Leptothyra paucicostata Dull. 



Leptothyra paucicostata Dall, Am. Jour. Conch., Vol. Vll, 1872, p. 131, PI. XV', fig. 10. Trvon, 

 Man. Conch., Vol. X, p. 248, PI. LXIII, fig. 27, 1888. Coopek, 7th Ann. Rept. Cal. 

 St. Min., 1888, p. 245. 



