HANNIBAL: CALIFOKNIAN FEESHWATEH IIOLLUSCA. 191 



The two are almost wholely peculiar to the American Province, 

 C. Cinciniiatiensis alone extending west as far as tlie Great Basin. 



CiNCiNNATiA CiNCiNNATiENSis (Anthony). 

 Faludina Cincinnatiensis, Anthony, 1840. 



Shell large and ventricose, spire elevated-conic ; habitat lakes and 

 sluggish streams. 



American Province. Utah System. 



Quaternary : Loess of eastern States ; Bonneville Lake beds, Utah. 



Genus Bkanneeillus, n.gen. 



Type, Brannerillus physispira, n.sp. 



Shell of rather small size, averaging 2-5 ram. in altitude, conic- 

 globose, whorls rounded or peripherally carinate, giving the shell 

 the appearance of an Ast7-(ea, umbilicate, sutures impressed, spire 

 elevated, but the apex conspicuously depressed below the plane of 

 the succeeding whorl, aperture nearly circular in rounded foi'ms, 

 peritreme complete; habitat apparently lacustrine. 



The present group is known to the writer only from a single fossil 

 species, biit the peculiar planorbiform apex immediately distinguishes 

 it from the other Nearctic genera of Amnicolidae, Cincinnatia 

 approacliing it most closely. In the development of a peripheral 

 keel in some instances, it resembles Pijrgidopsis, but tlie outline is 

 proportionately much narrower, and the apex merely obtuse in that 

 genus. 



Xamed after Dr. J. C. Branner, of the Department of Geology at 

 Stanford University. 



Brannekilltjs physispira, n.sp. PI. VITI, Fig. 28. 



? Valvata ' virens, Tryon ', J. G. Cooper, 1894 (juvenile). 



Shell as in genus. 



Altitude 2-5, breadth 3-3, altitude of aperture 1*7 mm. 



Pliocene : Kettleman Lake beds, California. 



Kettleman Hills near Coalinga, California; marl 'reefs' near 

 mouth of gulch south of Medallion One Canon, east flank of 

 Kettleman Hills (tvpes) (H. Hannibal); marl 'reefs' at head of 

 gulch north of Huron — Big Tar Caiion road, near Lakeview oil-well, 

 north flank of Kettleman Hills (Dr. J. C. Merriam) (H. Hannibal). 



Section 28, township 30 south, range 22 east. Telephone Hills, 

 near McKittrick, California (H. B. Moran). 



The present species, an extremely abundant one at tlie type 

 locality, Avliere it locally composes to a considerable degree the 

 mail 'reefs' (made up chiefly of Paludestrina lotiginqiia) that form 

 so prominent an element of the topography of the east flank of the 

 Kettleman Hills, is prevailingly carinate at this point. Elsewhere the 

 rounded form is the more common one. The large planorboid nucleus 

 in young specimens may have been the basis of Cooper's record of 

 Valrata, which lias not been verified from these beds. The two have 

 considerable superficial resemblance. 



