ARNOLD— THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 211 



or concave part of vvliorl are several line, revolving; lines; suture deeply impressed, distinct; aperture 

 long, narrow; posterior sinus near suture deep, prominent; anterior sinus short, recurved; outer lip 

 arcuate; pillar straigiit, spirally striate. 



Dimensions. — Long. 11.5 mm.; lat. 4.5 mm.; body-whorl 6.9 mm.; aperture 5.5 mm.; defi. 

 35 degrees. 



Di.stinfi;ui.sliablo by deep posterior sinus from otlici' inomhers nf the same 

 family. (Ori};iiially described from Pleistocene specimen.) Pronounced as "near 

 V. canjh'hm I)all,""l)y Dr. Dall. 



Rather common in the Pliocene and lower tSan Pedro series of Dcadman 

 l«laiid; rare in the lower San Pedro series and upper San Pedro series of San Pedro. 

 Found in the Pliocene at Packard's Hill; and in the Pleistocene at the bath-house, 

 Santa Barbara. 



Living. — San Pedro (Raymond). 



Pleistocene. — Santa Barbara (C'oopcr) : San Pedro; Santa Barbara (Arnold). 



Pliocene. — San Pedro; Santa Barbara (Arnold): San Diego well (Dall). 



Subgenus Cythara Schumacher. 



Shell lusilurm, polished, longitutlinally ribbed; aperture linear, truncated in front, slightly 

 notched behind; outer lip margined, denticulated within; inner lip frequently finely striated. 



Pleurotoma stromhoides Reeve is a characteristic species. 



184. Mangilia (Cythara) branneri, sp. nov. 

 Pi-ATK IX, Fiu. 10. 



Shell small, fusiform; spire elevated; apex rounded; whorls si.\; slightly convex, with six 

 sharp, slightly oblique, transverse ribs arranged in slightly twisted lines radiating from the apex; 

 suture impressed, distinct; aperture narrow, tnmcated in front, slightly notched behind; outer lip 

 margined; inner lip smooth. 



Dimensions. — Long. 10 mm.; lat. 4 mm.; body-whorl 6 mm.; aperture 4.5 mm.; defi. 

 27 degrees. 



Distinguishable by the few longitudinally connected, sharp, radiating ridges. 

 Pronounced by Dr. Dall as probably being new. Named in honor of Dr. John C. 

 Branner, Professor of Cieology in Leland Stanford Jr. University. 



Rather common in lower San Pedro series of Deadman Island. 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 i.s now in the 

 United States National Museum. 



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



Subgenus Mangilia Rifiso, s. s. 



Fusiform, mostly longitudinally ribbed, spire elongated, turriculated, acuminated; canal short, 

 more or less truncated; columella smooth; sinus near the suture. No operculum. 



Pleurotoma ponderosa Reeve is a characteristic species. 



