13 

 ghione ellsirierensis new sp. 



PI. 1, fig. 1 and 2. 



>w 

 Shell large, outline rather rounded; dental formula 



L. 010101, second cardinal tooth "bifid; shell ornamented 



"by concentric lamellae which disappear on eroded specimens; 



ar, HEX :** Bed linfc \ anterior 

 radial sculpture of flat ribs developed by weathering; 



escutcheon a distinct flattened area, the radial sculpture 



absent from the escutcheon, and for a distance of about ten 



.:;,:; A! Ir. length to one third 



millimeters below the escutcheon; ligament deep seated; 



\: . r-lope t^se y arcuat** fciiell rrarkd 



lunule lanceolate, bounded by impressed line. 



Compared to Qhione securis this species is longer 



g iv* 4 1 cor rxig at. ed app* ar - 

 anteriorly, the escutcheon is narrower, and the lunule is 



of the same width but twice as long. It appears similar to 



a specimen from the lower Miocene at Calabasas, figured by 



,1 -vw. ly i.i 'i andcr 



Ralph Arnold as . temblorensis, and which he says is similar 



to, or possibly identical with a form found in the upper 



-:* i '# f'rc-as c*/L9i* c.'ji<'- ?> fev* i^/45 



Miocene . 



' /v ,.c ; ifi2n*l.lar ftt i'uc tv$* , fend broad 



Altitude 75" mm.; latitude 95win, of which two thirds 



is posterior to the beak; diameter 45 mm.; lunule length 20 

 mm., width 12 mm. 



