402 MAZATLAN UNIVALVES 
JF. Mal. 1851, p. 22, no. 97.—C. B. Ad. Pan. Shells, p. 110, 
no. 120. 
Leptoconus regularis, H. & A. Ad. Gen. i. 252. 
Comp. Conus arcuatus, Brod. § Sow. Zool. Journ. vol. iv. 
p. 379.— Zool. Beech. Voy. p. 119, pl. 36, f.22.—Rve. Conch. 
Le. pl. 15, f. 77, 772. (Mazatlan.) 
This was the least uncommon of the Mazatlan Cones, but 
few-of the specimens were in astate attractive to collectors. 
The spire outlines are generally incurved. 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, tat. 1°28, div. 120°. 
Anelevated sp. ,, 2°38, se Bia (csi ell Lae pS i ret 1 A 
Hab.—Gulf Nicoya and gPanama; in soft mud 7—23 fm. ; 
Hinds.—Taboga; 1 imperfect sp. C. B. Adams.—Guaymas, 
Ineut. 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 PURPURASCENS, Brod. 
Proc. Zool. Soc. 1833, p. 54.—Mill. Syn. Nov. Test. Viv. p. 21. 
—Sow. Conch. Ill. pl. 25, f. 13.—Rve. Conch. Ic. pl. 19, 
f. 105.— Desh. in Lam. An. s. Vert. vol. xi. p. 134, no. 193.— 
Kien. Icon. Conch. p. 189, pl. 39, f. 2, pl. 61, f. 3—C. B. Ad. 
Pan. Shells, p. 108, no. 118. 
Ce cents (Leptoconus) purpurascens, H. & A. Ad. Gen. i. 
54. 
+ Conus comptus, Gould, Cal. § Mex. Shells, p. 14, pl. 14, f. 123. 
?+ Conus interruptus, Brod. & Sow. Zool. Journ. vol. iv. 
p. 379 :—Zool. Beech. Voy. p. 119, pl. 33, f. 2.—Rve. Conch. 
Terps 220%. 125. 
