222 PROCEEDINGS OF THE VATIONAL MUSEUM. vol.38. 



tend to be alternately darker and lighter. I have not found in our 

 large scries an exact duplicate in color pattern of Sowerby's original 

 figure in the Conchological Illustrations, but the mass of specimens 

 approach it. As a. whole the color effect is darker than in the pre- 

 viously mentioned forms of the group, and there is a notable tendency 

 of the color markings to form groups in the spiral sense. 



Another form closely allied to this, which is listed as C. dispar 

 Sowerby, in the Thesaurus, though not the original 0. dispar of the 

 Conchological Illustrations, is characterized by a bluish or livid ground 

 color, which gives a very different aspect to a shell not otherwise sepa- 

 rable from ( '. regularis. 



This has been collected from Topolobampo, Mexico, to the Gulf of 

 California. 



CONUS MONILIFER Broderip, 1833. 



Gulf of California. (Magdalena Bay, Lower California, south to 

 rem.) 

 This is a smaller and more slender shell than the members of the 

 group just discussed. It has a relatively sharp, elevated, but not 

 scalar spire; and the brown articulations of the spirals tend to be 

 small, distant , and squarish, while the nebulous blotches are smaller 

 and more widely separated. 



CONUS INCURVUS Broderip, 1833. 



( rulf of California to Ecuador. 

 This has been confused by Tryon with recurvus (Broderip) 

 Kiener, 1839. Tt is a small shell, with a, marked and sharp angle at 

 the shoulder, the sides slightly incurved, the spire short, relatively 

 to others of this group, and the ground color of a livid flesh color. It 

 is easily separated from the others by its general appearance and size, 

 which does not exceed 26 mm. in length in our specimens. 



CONUS DISPAR Sowerby, 1833. 



( rulf of California. 



This is the original < '. dispar of the Conchological [llustrations. It 

 has the shortest and most disproportionate spire in the group. It is 

 small, narrow, straight-sided, smooth, with a low pointed spire (about 

 one-seventh the entire length) and a few sharp sulci near the canal. 

 The coloration in all our specimens is white or pale, a i'cw light-brown 

 flammules on the spire and nebulous patches on the >ides. the spiral 

 painting being mainly of small, distant , sparse, squarish dots with an 

 obscure indication of two paler non-nebulous bands on the sides of 

 the shell. 



Though belonging to the Proteus group, this seems, as far as our 

 specimens indicate, specifically different from the others. 



CONUS EMARGINATUS Reeve, 1843. 



Acapulco, Mexico, to Ecuador. 

 This cone ha-- been well figured on several occasions and is readily 

 Identifiable, but greal is the confusion to which it has submitted. It 



