PLATE X L V FT. 



PLIOCEN'I'; I'l'X'TENS. 



[T'liU'ss ulhiTwisf stated nil lij^iin-s art' ai)priiximately natural sizp.] 



Page. 



Fii.. I. I'fchii { Li/ro/iirlni) <isli/i'iii u. y\i. W ('. Tv|H' 122 



Exterinr iif ri<.'lit vnlve; iiltitiiile l-'i'i iimi. 



Plidi-ene, Ceri-os Island, nff Lower Califiinii:i. (11.) 



Fic:. l'(. Same specimen as li.<r. 1 122 



( liitliiie iif liolli valves as vieue'l I'n i?ii llie rear. ( .M. I'.) 



238 



