GASTROPODA— STROMBIDJE. 



7S7 



CXL. Rimella Agassiz. 



More or less high-spired shells ; base drawn out into short sharp 

 canal; inner lip with expansion covering part of spire, outer lip 

 with thick but scarcely expanded margin, entire or crenulated and 

 with anterior notch. Cretacic-Recent. 

 506. R. laqueata Conrad. (Fig. 1102.) Eocenic. 



High spired; sutures scarcely impressed; ribs acute, slightly 

 curved, restricted to upper part of whorl ; spirals fine ; outer lip 

 smooth. 



Claibornian of Alabama. 



CXLI. Strombus Linne. 

 Young shell more or less fusiform with conical spire variously 

 ornamented by ribs, spires and tubercles ; adult with large body 

 whorl, and thick, expanded but not spinose outer lip, often pro- 



FiG. 1 103. Strombus aldrichi, slightly reduced, Xf (After Dall.) 



duced posteriorly, sinuate or channelled anteriorly ; columellar area 



smooth, enameled. Cretacic-Recent. 



507. S. aldrichi Dall. (Fig. 1103.) Oligocenic. 



Youngest whorls round and ribbed, later ones angular, the 

 ribs becoming concentrated as tubercles on the angle, and coarse 

 on body whorl ; lip moderately expanded, subrectangular above 

 (posteriorly) with slight posterior, and strong broad anterior 

 (lower) channel. 



Abundant in the Chipolan beds of Florida. 



