ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OP SAN PEDRO. 211 



or concave part of whorl are several fine, revolving lines; suture deeply impressed, distinct; aperture 

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

 arcuate; pillar straight, spirally striate. 



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

 35 degrees. 



X)istingiiisliable by deep posterior sinus from other members of the same 

 family. (Originally tiescribecl from Pleistocene specimen.) Pronounced as "near 

 C. canjieldii Dall," by Dr. Dall. 



Rather common in the Pliocene and lower San Pedro series of Deadman 

 Island; 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 (Cooper): San Pedro; Santa Barbara (Arnold). 



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



Subgenus Cythara Schumacher. 



Shell fusiform, polished, longitudinally ribbed; aperlure linear, truncated in front, slightly 

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



Pleurotoma stromboides Reeve is a characteristic species. 

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



Plate IX, Fig. 10. 



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

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

 suture impressed, distinct; aperture narrow, truncated 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.; defl. 

 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 Geology 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 is now in the 

 United States National Museum. 



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



Subgenus Mangilia Risso, 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. 



