MAZATLAN UNIVALVES 405 
480. Conus GLADIATOR, Brod. 
Proc. Zool. Soc. 1833, p. 55.—Mill. Syn. Nov. Test. Viv. 
p. 121.—Sow. Conch. Ill. pl. 33, f.34.—Rve. Conch. Ic. pl. 22, 
f. 127.—Kien. Icon. Conch. p. 25, pl. 15, f. 4, pl. 109, f. 4.— 
O. B. Ad. Pan. Shells, p. 105, no. 114. 
Rhizoconus (Leptoconus) gladiator, H. § A. Ad. Gen. 1. 252. 
This unpretending species is known when fresh by its ex- 
tremely thick, somewhat deciduous epidermis, which lies in a 
spongy mass, with ridges of growth, and distant spiral rows of 
hairs, which often group into pairs. It is thick on the spire, 
with a row of scaly bristles over the tuberculous shoulder. 
Sinus area spirally striated. The elevation of the spire is 
extremely variable. Operculum resembling that of C. puncticu- 
latus, but larger, less bent, and commonly decollated. The larg- 
est sp. measures long. 1°77, long. spir.°17, lat.1°12, div. 140°. 
A flat sp. 5 AG Zt Ks Oj 50) $Sasb i euseaes 
A slender sp. sau ele oy AEP © Seman soe [os 
Hab.=Panama; in sandy or soft mud, in the clefts of rocks ; 
Cuming.— Do.; at low water mark, mostly under stones 
which were more or less mingled with sand, not uncommon ; 
C. B. Adams.—S. W. Mexico, P. P. C.—Mazatlan ; rare, 
generally encrusted with coralline, Bryozoa, &c. ; L’pool Col. 
Tablet 1935 contains 3 sp. stout, elevated.—1936, 3 do. nor- 
mal.—1937, 3 do. flat.—1938, 3 sp. slender, flattened.—1939, 
3 do. elevated.—1940, 3 sp. mended after fracture.—1941, 1 sp. 
with rough portion of epidermis removed, resembling C. regali- 
tatis.—1942, 2 sp. epidermis removed.— 1943, 4 opercula, of 
which one is normal, and another is mended from a sub-central 
nucleus. 
481. Conus nux, Brod. 
Proc. Zool. Soc. 1833, p. 54.—Mull. Syn. Nov. Test. Vio.— 
p. 120.—Sow. Conch. Ill. pl. 32, f. 31.— Rve. Conch. Ic. pl. 20, 
f. 110.—Desh. in Lam. An. s. Ve ert. vol. xi. p. 129, no. 185.— 
Kien. Icon. Conch. p. 47, pl. 11, f. 3, pl. 102, f.2.—C. B. Ad. 
Pan. Shells, p, 106, no. 116. 
Coronaxis (Conus) nux, H. ff A. Ad. Gen. i. 248. 
Most of the Mazatlan specimens are distorted, but may be 
recognized by the deep violet stain at the base, and the nearly 
smooth epidermis, which is adherent, with faint strie of 
growth. The spire is tuberculous, sometimes flattened. The 
