See "Sea Shells of Tropical West America, A. Myra Keen second
addition,1971.
Which is a must book for West Mexico coast.  It says on page 667:
 
1508. Conus (Leptoeonus) sealaris Valenciennes, 1832 (Synon)
dispar Sowerby, 1833). The shell is slender, with a high, turreted spire
concave in profile. Color markings trend to yellows, irregularly clouded
in squares or in stripes. The variant C. dispar has a lower and
straighter spire.  Because of the intergradation with the C. regularis
complex, some authors regard this as not a separable species. Length, 47
mm; diameter, 17 mm. Cedros Island Baja California, through the Gulf of
California and south to Acapulco, Mexico, in depths of 15 to 145 m.
 
Walls in "Cone Shells"Lists C. scalaris as a synonym of C. gradatus.  Pg
527.
 
Aloha,
 
Wes