ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 213 



187. Mangilia interfossa var. pedroana, var. nov. 



Plate VI, Fig. 3. 



Majigilia iti/er/ossa Cpr., Brit. Assn. Rept., 1863, p. 658; Ann. & Mag. Nat. Hist., 3d Ser., Vol. 



XV., 1865, p. 29. 

 Daphnella mterfossa Cpr., Tryon, Man. Conch., Vol. VI, p. 310, PI. XXII, fig. 11, 1884. 



Shell small, turreted, elongate-fusiform; apex acuminate; whorls six, convex, ornamented 

 with about sixteen rounded, slightly oblique, transverse ridges and four to six sharp, raised, spiral 

 lines in the interspaces; suture deeply impressed; aperture narrow, slightly oblique, elliptical; outer 

 lip thin, simple; inner lip smooth. 



Dimensions. — Long. 7.5 mm.; lat. 2.5 mm.; body-whorl 4.1 mm.; aperture 2.8 mm.; defl. 

 30 degrees. 



Distinguishable from M. inter lirnta by broader form, more convex whorls, and 

 more numerous lines of sculpture. Specimens pronounced new variety of M. inter- 

 fossa by Dr. Dall. 



Rare in lower San Pedro series at Deadraan Island; and in upper San Pedro 

 series at Crawfish George's. Found also in the Pleistocene at bath-house, Santa 

 Barbara. The specimen figured is the type, which is from the lower San Pedro series 

 at Deadman Island, and is now in the United States National Museum. 



Pleistocene. — San Pedro; Santa Barbara (Arnold). 



188. Mangilia interlirata Stearns. 



Plate VI, Fig. 15. 



Mangilia interlirata BTTS.Av.iiS, Proc. Cal. Acad. Sci., Vol. IV, 1872, p. 226, PI. I, fig. 10. Tryon, 

 Man. Conch., Vol. VI, p. 249, PI. XXII, fig. 56, 1884. 



Shell small, elongate, fusiform; spire much elevated; apex acute; whorls six, slightly con- 

 vex, ornamented by nine or ten slightly oblique, rather narrow, transverse ridges; spiral sculpture 

 consists of three or four sharp raised lines, which extend to base of body-whorl; suture impressed, 

 distinct; aperture narrow, elliptical; outer lip thin, simple; inner lip simple; canal simple. 



Dimensions. — Long. 8.8 mm.; lat. 3 mm.; body-whorl, 4.9 mm.; aperture, 3 mm.; defl. 

 25 degrees. 



Distinguishable from M. interfossa var. 'pedroana by its slenderer outline, 

 fewer transverse and spiral ridges, and flatter whorls; distinguished from others of 

 the genus by the prominence of its spiral lines. Specimens identified by Dr. Dall. 



Rare in lower San Pedro series at Deadman Island, and in the upper San 

 Pedro series at Los Cerritos. The specimen figured is from the Lower San Pedro 

 series at Deadraan Island, and is now in the collection of Delos Arnold. 



Living. — West Coast. 



Pleistocene. — San Pedro (Arnold). 



189. Mangilia oldroydi, sp. nov. 



Plate VI, Fig. 16. 



Shell small, turreted, elongate-fusiform; apex acuminate; whorls seven, convex, rather 

 shouldered above, and crossed by sixteen slightly oblique rounded ridges; transverse ridges become 



