ARNOLD— THE PALEONTOLOGY AND STltATIGKAI'IIY OF SAN I'F.DnO. 211 



or concave part of wliorl 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. u.5min.: lat. 4.5 mm.; l)ody-\vhorl 6.9 mm.; aperture 5.5 mm.; dcfl. 

 35 degrees. 



Distiiiji'uisluible by deep posterior sinus from other members of the same 

 famil}'. (Originally described from Pleistocene specinKjn.) I'ronounced as "near 

 C. canfieldii f)all,"'by Dr. Dall. 



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

 Island; rare in the lower Ran 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; 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. 



Plate IX, Fu;. 10. 



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

 sharp, slightly oblique, transverse ribs arranged in slightly twisted lines radiating from the aj^ex; 

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

 margined; inner lip smooth. 



Difnensions. — Long. 10 mm.; hit. 4 mm.; body-whorl 6 mm.; aperture 4.5 mm.; defl. 

 27 degrees. 



Distinguishable by the few longitudinally connected, sliarp, 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 Kational Museum. 



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



Subgenus Mangilia iJ/.s.so, .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 jmnderosa Reeve is a characteristic species. 



