MOLLUSCA. 719 



dimensions of a nearly perfect specimen from Texas are: total 

 height, exclusive of the wing-like extensions of the aperture, 35 

 mm. ; height of spire, 18 mm. ; maximum diameter of body volu- 

 tion, 23 mm.; extension of the processes on the border of the 

 outer lip from 18 mm. to 33 mm. The volutions of the spire 

 are marked by a revolving keel a little below the mid-height of 

 each volution, the sutures not impressed below the surface of 

 the spiral, concave band between the carinae of succeeding volu- 

 tions. Greatest height of the body volution, exclusive of its 

 wing-like extensions, about equal to the greatest height of the 

 spire, marked by a second less sharply angular revolving rib, 

 which is situated about as far below the upper carina as that is 

 below the upper suture, and by three other less distinctly marked 

 ones near the anterior margin, the two lower of which are dis- 

 tinctly recurved. When the outer lip of the aperture is com- 

 plete it is produced into six elongate, divergent, conspicuous, 

 wing-like processes, which are strengthened along their median 

 lines by thickened ribs or carinae, the median carinse of five of 

 these processes being continuations of the ribs upon the body 

 volution of the shell. The most posterior of the processes is a 

 branch from near the base of the one next to it, and its median 

 line is subparallel to the axis of the spire. , Surface of the shell 

 marked only by fine, inconspicuous lines of growth. 



Remarks. This species was originally described from a por- 

 tion of the body volution and parts of the upper wing-like pro- 

 cesses of the outer lip, and no figure or description of a complete 

 example has previously been given. The nearly perfect indi- 

 vidual which has served as a basis for the foregoing description 

 and' the accompanying illustration of the species is from Texas, 

 and is preserved in the collection of the National Museum at 

 Washington. In New Jersey no example preserving the wings 

 of the aperture has been observed, but one small, although 

 nearly perfect, internal cast exclusive of these processes has 

 been collected, which differs in no essential respect from the 

 larger example from Texas. 



Formation and locality. Wenonah sand, near Crawfords 

 Corner (i26 3 ). 



Geographic distribution. New Jersey, Mississippi, Texas. 



