AKNOl.l) THi; rAI.KONTOUKiV AND STHAIK I llA I'll V ill' SAN PEDRO. 323 



368. Leptothyra bacula Carf)enler. 



I.epioHyx bacula Cl'R., Brit. Assn. Rt-pt., 1863, p. b^r. Kk.kp, West Coast Shells, p. 87, 1892. 

 Leptothyra bacula Cpr., Gahb, Pal. Cal., Vol. II, p. 85, 1869. Coopkr, 7lh Ann. Rept. Cal. St. 

 Min., 1888, p. 245. Williamson, Pmc. U. S. Nat. Mus., Vol. XV, 1892. p. 199. 



Shell small, turreted, thick; surface sculptincil by fine spiral lines; no umbilicus; aperture 

 cin-ular, slightly angulated anteriorly. 



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



Tlic spcciincii from tlio Pleistot'eiui sliows the oriji;iniil ])ink color of the living 

 ,<lifll, iiiul looks very nuu'li like :i very siiiiill NorvWvi norrixii, exeept that the Lcp- 

 I11//11//11 ha.s 111) iiiul)iliriis. 



Distinguisliahle fimn A. cnrpenteri aiui A. /iinicicosUita by its niiicli liner spiral 

 si'iilptiire Mild |)iiiki.sh coioi'. 



()iie s[)eeimcn from the lower San I'edro series of Deadnian I.sland; al.so 

 fdiiiid in the lower San Pedro series at Los Cerritcs. Found in the Pleistocene at 

 liaili-iiouse, Santa Barbara. 



Zu'tn</.— -Monterey to Catalina Island (Cooper). 



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

 bara (Arnold). 



369. Leptothyra carpenter! Pilsbry. 



Lcptotltyra carpenteti 1'ilsbrv, Tryon, Man. Concii., Vol. X, p. 247, PI. XXX1X<7, figs. 26-29, 

 1888; Nautilus, July, 1890. Wii.i.lvmson, I'roc. U. S. Nat. Mus., Vol. XV, 1893, p. 199. 



Leptotliyra samiuincus LiNN., Cpk., Brit. Assn. Rept., 1863, p. 652. 



Leptothyra sanguinca Cpr., Gahb, Pal. Cal., Vol. II, ]). 85. 1869. Trvon, Syst. Conch., Vol. I, 

 PI. II, p. 312, 1882. Cooper, 7th Ann. Rept. Cal. St. Min., p. 245, 1888. (Not 

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



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



Shell small, sul)conical, thick; spire only slightly elevated; vvhoils 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. 



Distingnishable from L. iviuclcostida by larger size, greater number and less 

 promineiioe of s[)iral ridges, and by less prominence of suture; distinguishable from 

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



Found ill lower San Pedro series at Deadraan Isliind, and San Pedro; and 

 in tli(> 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 Ihill. 



Leptothyra patccicostata Dall, Am. Jour. Conch., Vol. VII, 1872, p. 131, PI. XV, fig. 10. Tryon, 

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

 St. Min., 1888, p. 245. 



