488 - 



Gabb's (1^ Santo DoKiinp-ian T_. oimeata 'Orbigny is more like that 



(1). Trans. Am. Philos. Soe., newser., vol. 15, p. 249, 1875. 



recent species than sinipsoni , being less conver-. than the Bowden 

 form, more evenly romide ''l loosteriorly, "-ithoiit the nosterior 

 constriction and with rather rc-giilar, fine concentric striae. 



Oecairrenoe.- Lov/er Miocene: 3ov;den be '-Is, Bowden, Jaraaica 

 (Dall, 19^0). 



