Shell rounded triangular, inflated, with very high involute prosocoelous 

 beaks; sculptured with about thirty-three narrow, angular radial ribs, uni- 

 formly distributed and with about equal interspaces, the entire surface closely 

 and minutely granulose ; the granules are more or less arranged in radial lines ; 

 basal margin arcuate, produced towards the middle, serrate by the sculpture, 

 nymphs strong ; interior brilliantly pearly and very much disposed to scale off. 

 Lon. 5.5, alt. 5.0, diam. about 6.0 mm. 



This shell, external, looks like a minute Pecchiolia. The pearly substance 

 is so friable that it is hardly safe to attempt to describe the hinge, all the speci- 

 mens being more or less defective. There is no lunule. The shell is much 

 heavier than the Bowden species and more pearly. 



Verticordia sp. indet. 



Eocene of Wood's Bluff, Alabama ; Burns. 



This species is clearly different from any of the others, but is represented 

 only by a single worn right valve in the collection. It has sixteen rather low, 

 close ribs, uniformly distributed and covered with a marked granulation. The 

 ribs are closer and wider than in V. eocenensis and the interspaces correspond- 

 ingly narrower. It has the aspect of an Haliris rather than a typical Verti- 

 cordia. 



Aldrich in his paper in the " Nautilus" (Jan., 1903, p. 101, pi. iv., figs. 22, 

 23) has described and figured Verticordia (Haliris) quadrangularis from the 

 Eocene of Alabama. It is said to have fewer and more rounded ribs and a 

 more depressed lunular area than V. mississippiensis. 



Verticordia (Haliris) jamaicensis n. sp. 



Oligocene of the Bowden marl, Jamaica ; Henderson and Simpson. 



Shell small, thin, subquadrate, inflated, with strongly prosoccelous beaks ; 

 sculptured with about twenty-seven radial close-set ribs with narrower inter- 

 spaces ; a smooth, deep lunular impression in front of, and a narrow, escutcheon- 

 like, smooth area behind them, the whole surface minutely granulose; basal 

 margin angularly produced near the middle, internally minutely fluted in har- 

 mony with the ribs ; hinge normal. Alt. 4.75, Ion. 4.5, diam. 4.6 mm. 



This has a general resemblance to V. mississippiensis, but is smaller, thinner, 

 proportionately shorter, and more inflated. 



Verticordia (Trigonulina) sp. indet. 



Vicksburgian Oligocene at Vicksburg, Mississippi ; Haldeman. 

 A fragment of an unmistakable Trigonulina was found in the marl filling 



