MAZATLAN UNIVALVES 227 



. Australia, Menke South Africa, Krauss. Mazatlan ; 

 1 very young sp. off Chama ; Upool Col. 

 Tablet 1087 contains the specimen. 



GENUS TJVAJNILLA, Gray. 



Fig. Moll. An. p. 87, no. 8 : H. $ A. Ad. Gen. i. 400. 

 Imperator, sp Montf. awc. = Calcar, sp. Phil. Handb. Conch. 



p. 107. Distinguished by the want of umbilicus, and the 



bi-ridged operculum. 



286. UVANILLA (IMPEEATOK) OLIVACEA, Mawe. 



Trochus olivaceus, Gray in Wood Suppl. p. 16, no. 3, pi. 5. 



Kien. Ic. pi. 13, f. 2, (parva.)-Rve. Conch. Syst. pi. 217, f. 7. 



T. (Calcar) ol. Mke. Zeit.f. Mai: 1850, p. 171, no. 28.Kust. 



Mart. no. 226, p. 214, If. 103, pi. 32, f. 3, If. 84 (quasi Wood) : 



do. loc. tit. f. 2, (quasi five.) 



Imperator olivaceus, P. P. C. Cat. Prov. et hie antea. 

 UvaniUa olivacea, H. $ A. Ad. Gen. i. 400, pi. 6 a, 6 b, 6 c. 

 = Trochus brevispinosus, Val. Voy. Yen. (non Lam.) Chenu, 



Conch. HI. 

 = Trochus (Calcar) erythrophthalmus, Phil, in Zeit. f. Mai. 



1848, p. 188. Kust. Conch. Cab. p. 93, pi. 45, f. 3. 

 Jun. ? = Trochus (Calcar) Melchersi, Mice, in Zeit. f. Mai. 



1850, p. 171, no. 29. 

 Comp. Trochus Buschii, Phil. : v. Zeit.f. Mai. 1848, p. 189, 



no. $IKmt. Mart. no. 265, lief.' 103, p. 213, pL 32, f. 1, 



lief. 84 (Panama.) Kien. loc. cit. pi. 31, f. 1, 1 a. 



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 costre. 



Shell large, rather thin. Whirls rather swollen in the body, 

 crossed by very numerous, slanting rugse, perpendicular to the 

 labral margin, and generally continued to the periphery. This 

 is expanded, winged, and armed with a very variable number 

 (20 or upwards) of vaulted tubercles. Base concave within the 



