712 



NORTH AMERICAN INDEX FOSSILS. 



4 



Fig. 1026. Solarium 

 alveatum. (After Con- 

 rad. ) 



356. S. alveatum Conrad. (Fig. 1026.) 



Eocenic. 



Spire trochiform ; sutures not impressed ; 

 whorls flat, smooth, with two spirals near 

 suture ; angulation sharp, base flattened with 

 peripheral grooved lines ; umbilicus profound, 

 margined by ring of triangular dentations. 



Abundant in Claibornian of Alabama. 



357. S. trilineatum Conr. (Fig. 1027.) 



Miocenic. 



Periphery with smooth carina, beneath 

 which on the body is another smooth carina ; 

 gently convex shoulder with two beaded 

 spirals, one close to each bounding suture. 



Calvert formation of Maryland. 



Fig. 1027. Solarium trilineatum. (After Md. Survey.) 



Family Capulim: Cuvier. 

 CVII. Capulus Montfort. 

 Conical or cap-shaped shells with apex curving towards the pos- 

 terior end, and often slightly enrolled. 

 A horse-shoe shaped muscle impres- 

 sion on the interior ? (This is probabably 

 a polyphyletic group ; the Palaeozoic 

 species referred here belong elsewhere.) 

 Triassic— Recent. 



358. C. expansus (Whitf.). (Fig. 1028.) 



Eocenic. 

 Small, broadly expanded, apical volu- 

 tions one to two ; surface with growth lines. 

 Chickasawan (Lignitic) of Alabama. 



Fig. 1028. Capulus expansus. 

 (After Harris.) 



