402 MAZATLAN UNIVALVES 



/. Mai. 1851, p. 22, no. 97. C. B. Ad. Pan. Shells, p. 110, 



no. 120. 



Leptoconus regularis, H. fy A. Ad. Gen. i. 252. 

 Comp. Conns arcnatns, Srod. 8f Sow. Zool. Journ. vol. iv. 



p. 379. Zool. Seech. Toy. p. 119, pi. 36, f. 22. Rve. Conch. 



Ic. pi. 15, f. 77, in. (Mazatlan.) 



This was the least uncommon of the Mazatlan Cones, but 

 few of the specimens were in a state attractive to collectors. 

 The spire outlines are generally incurred. It is known at once 

 by the conical form, and dark tessellations over a lighter ches- 

 nut ground. Epidermis extremely thin, adherent, almost 

 smooth ; on the sinus area, with coarse ridges of growth, 

 surmounted by fine bristles in spiral rows. The animal pro- 

 bably retires some way into the shell, as the epidermis is not 

 removed on the labium within the aperture. Operculum out- 

 side more or less concave ; with the muscular scar shewing 

 non-angular ridges of growth. The largest of the specimens 

 measures long. 2*38, long. spir. '4, lat. 1*28, div. 120. 



An elevated sp. 2'38, '57, 1'12, 84. 

 Slab. Gulf Nicoya and Panama ; in soft mud 7 23 fm. ; 



Hinds. Taboga ; 1 imperfect sp. C. B. Adams. G-uaymas, 



Lieut. Green. Mazatlan ; not common : L'pool Col. 



Tablet 1916 contains 3 sp. broad form. 1917, 3 sp. elongat- 

 ed. 1918, 1 do. spire outlines nearly straight. 1919, 1 sp. 

 spire very much elevated. 1920, 2 sp. after hot acid, shewing 

 colour. 1921, 4 sp. curiously deformed after fracture ; one 

 with a spiral canal. 1922, 1 normal and 2 abnormal opercula. 



476. CONUS PURPUKASCENS, Brod. 



Proc. Zool. Soc. 1833, p. 54. Mull. Syn. Nov. Test. Viv. p. 21. 



Sow. Conch. III. pi. 25, f. IB. Eve. Conch. Ic. pi. 19, 



f. 105. Desk, in Lam. An. s. Vert. vol. xi. p. 134, no. 193. 



Kien. Icon. Conch, p. 189, pi. 39, f. 2, pi. 61, f. & C. JB. Ad. 



Pan. Shells, p. 108, no. 118. 

 Chely conns (Leptoconus) purpurascens, H. & A. Ad. Gen. i. 



254. 



+ Conus comptus, Gould, Cal'fy'Mex. Shells, p. 14, pi. 14, f. 123. 

 ?+ Conus interruptus, Brod. fy Sow. Zool. Journ. vol. iv. 



p. 379 'Zool. Seech. Voy. p. 119, pi. 33, f. 2. Rve. Conch. 



Ic. pi. 22, f. 125. 



