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TERTIARY FAUNA OF FLORIDA 



and hardly pointed, slightly flexed, posterior end, the anterior end evenly 

 rounded, base convexly arched ; lunula obsolete ; disk covered with a fine 

 radial threading, more or less concealed by fine, elevated, concentric sharp 

 lamellae ; hinge normal, teeth large and strong for the size of the shell ; pallial 

 sinus large, nearly reaching the anterior adductor scar, largely confluent 

 below ; above rising above the level of the posterior adductor. Lon. 7, alt. 

 5.5, diam. 3 mm. 



This very compact and sharply sculptured little shell is very distinct from 

 any of the other local or any American species. 



Tellina (Merisca?) halidona n. sp. 

 Plate 38, Figures 3, 3a. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, Florida; 

 Ball. 



Shell small, solid, inflated, very inequilateral, elongate and rounded in front, 

 obliquely subtruncate in front ; beaks full, low, not conspicuous, base convexly 

 arcuate ; lunule and escutcheon obsolete ; surface smooth or with incremental 

 lines, not polished ; hinge normal, pallial sinus high, short, mostly confluent 

 below. Lon. 14.5, alt. 11.5, diam. 6.5 mm. 



This species rests upon a single left valve of which a very perfect silicious 

 pseudomorph was collected, consequently the hinge characters of the right 

 valve are unknown. It seems highly probable, however, that it is referable to 

 Merisca. T. (Macaliopsis) merula Dall is the most similar species of this 

 horizon, but has a better developed hinge and different outline. 



Tellina (Merisca) sclera n. sp. 

 Plate 49, Figure S- 



Oligocene of the Bowden marls, Jamaica, West Indies. 



Shell minute, short, plump, with low inflated beaks, rounded in front and 

 below, shorter and blunt behind ; slightly flexed, not rostrate, but with an 

 obsolete posterior radial sukus in the right valve; sculpture of elevated 

 crowded concentric threads, becoming alternately obsolete towards the ends 

 of the shell where the persistent threads are more elevated and tend to become 

 lamellose ; hinge normal, strong for the size of the shell ; pallial sinus short, 

 round, confluent below. Lon. 4.2, alt. 3.2, diam. 2 mm. 



This little shell is not unlike T. acrocosmia Dall, but smaller and without 

 the strong radial sculpture. 



