- l-':3 6 



TJIITIM (AJ^GUIUS) ^:iOV/iyi n. sr). 



Description *- -^hell small, thin, clon'^a/';ecl, moderately in- 

 equilateral, moderately convezc; rouMed anteriorly, posteriorly 

 almost vertically sub truncated below; ant ero- dor sal narpin lon.^', 

 straight; postero-dor sal mar |-^ '-liprhtly eizcavated near the 

 umbo, Joining the subtrurioated posterior cnd~ at a subrounded 

 angle of about 110 ; wabo acute, placed behind the median hor- 

 izontal; posterior carina poorly defined, rounded; surface smooth, 



or bearing a f ev/ distant concentrio striae; hinge of the left 

 valre normal, the cardinals weak; right valve not known; pallial 

 sinus obscure. 



Dimensions .- Length, 4.5 mm.; alt,, 2.5 mm.; semidiam., 1.2 



Rena rk s . - _T. bro\ mi is represented by two left valves, 

 the type beii^g sliP'htly smaller. It is di stine'iiishe d from the 

 young of the coe^ristent members of the section by its more prod- 

 uced and subtruncated posterior end, slightly excavated rsosterior 

 dorsal margin and -ooorly defined posterior carina. 



This species is named for '. . B. Brown, a member of the 

 early Jamaican Survey. 



Occurrence .- lower Miocene: Bov/den beds, Bowden, Jamaica. 



