MAZATLAN UNIVALVES 227 
Hab—Australia, Menke—South Africa, AKrauss.—Mazatlan ; 
1 very young sp. off Chama; L’pool Col. 
Tablet 1087 contains the specimen. 
Genus UVANILLA, Gray. 
Fig. Moll. An. p. 87, no. 8 :—H. & A. Ad. Gen. i. 400. 
Imperator, sp Montf. auct.=Calear, sp. Phil. Handb. Conch. 
p. 107.— Distinguished by the want of umbilicus, and the 
bi-ridged operculum. 
286. UvaniLua (ImMpERATOR) OLIVACEA, Mawe. 
Trochus olivaceus, Gray in Wood Suppl. p.16, no. 3, pl.5.— 
Kien. Ic. pl. 13, f. 2, (parva.J)—Rve. Conch. Syst. pl. 217, f.7.— 
T. (Calear) ol. Mke. Zeit. f. Mal. 1850, p. 171, no. 28.— Kust. 
Mart. no. 226, p. 214, lf. 103, pl. 32, f. 3, lf. 84 (quasi Wood) :— 
do. loc. cit. f. 2, (quasi Rve.) 
Imperator olivaceus, P. P. C. Cat. Prov. et hic antea. 
Uvanilla olivacea, H. § A. Ad. Gen. i. 400, pl. 6 a, 65, 6c. 
=Trochus brevispinosus, Val. Voy. Ven. (non Lam.)—Chenu. 
Conch. Ili. 
=Trochus (Calcar) erythrophthalmus, Pil. in Zeit. f. Mal. 
1848, p. 188.—Kust. Conch. Cab. p. 93, pl. 45, f. 3. 
Jun. ?=Trochus (Calcar) Melchersi, Mke. in Zeit. f. Mal. 
1850, p. 171, no. 29. 
Comp. Trochus Buschii, Phil. : v. Zeit. f. Mal. 1848, p. 189, 
no. 67.—Kust. Mart. no. 265, lief. 103, p. 213, pl. 32, f. 1, 
lief. 84 (Panama.)— Aven. loc. cit. pl. 31, f. 1, 1a. 
Philippi, having regarded the T. olivaceus of Wood to be 
distinct from that of Reeve, re-named the latter, which has a red 
pillar, T. erythrophthalmus. According however to the type 
in the collection of Dr. Gray, the red-tinted shell, figured 
as such by Reeve, is the true T. olivaceus of Wood, which 
name is therefore retained.—The T. Buschii, as figured by 
Kiener, almost exactly accords with U. olivacea; but the 
outside is covered rather with corrugations than with slanting 
ribs: umbilicus faint red: base covered with obsolete rounded 
spiral coste. 
Shell large, rather thin. Whirls rather swollen in the body. 
crossed by very numerous, slanting ruge, perpendicular to the 
labral margin, and generally continued to the periphery. This 
is expanded, winged, and armed with avery variable number 
(20 or upwards) of vaulted tubercles. Base concave within the 
