20 



Bulletin 37 



20 



Rochefortia minuta, n. sp. PI. 2. Figs. 27, 28 



Shell, small, ovate ; nearly equilateral ; periostracum still 

 adherent, surface showing a few incremental lines ; beaks point- 

 ed, with a resiliary pit underneath v*^ith short lamellae on each 

 side, the posterior one the longest ; muscular scar slightly im- 

 pressed ; the right valve has a space for the left lateral ; pallial 

 line simple. Resembles somewhat Rochefortia Stimpsoni Dall. 

 The space in our specimen under the beak looks as though it had 

 been excavated out of the dorsal side, but such is not really the 

 case. Prof. W. H. Dall has examined this specimen, and veri- 

 fied its generic position. Am gfeatly indebted to him in a num- 

 ber of cases. Length 3 mm. ; height 2 mm. 



Locality. — Bell's Ldg., Alabama River, Ala. 



Type. — Ala. Museum. 



Montacuta bicuspidata, n. sp. Fl. 2. Figs. 29, 30. 



Shell minute, oblong-ovate ; surface with incremental lines ; 

 beaks carrying the prodissoconch, nearly central ; viewing the 

 shell from the outside and above, it shows two tooth-like projec- 

 tions, one on each side of the beak, rising from the dorsal mar- 

 gin and another shorter one which does not show like the two 

 first mentioned ; ends rounded ; base arcuate ; hinge with a small 

 subtrigonal tooth and also a space for a lateral in the other valve. 

 Pallial line simple ; adductors distinct but not deep. I^ength 2^ 

 mm ; height 2 mm. 



Locality. — Bell's Ldg., Ala. 



Type. — Ala. Mus. of Nat. History, University, Ala. 



Basterotia ? prima, n. sp. PI. 3. Figs, i, 2, 3. 



Shell small ; valves rather thick ; subquadrangular ; beaks 

 subterminal ; shell profoundl}^ gaping at the anterior ventral 

 part ; a depressed space running from umbo to ventral margin ; 

 surface nearly smooth, showing growth lines which also show in 

 the interior. Anterior adductor scar deep, with a raised 

 border buttressed to hinge plate ; posterior scar slightly im- 

 pressed, pear-shaped and both rather large for the size of shell ; 

 one cardinal tooth in right valve, corresponding to a deep socket 



