MAZATLAN UNIVALVES 227 



Sab. — Australia, MenTce.—^ovAh. Africa, Krauss. — Mazatlan ; 

 1 very young sp. ofi' Chama ; L'pool Col. 

 Tablet 1087 contains the specimen. 



Genus m^ANILLA, Gray. 



Fig. Moll. An. p. 87, no. 8 -.S. Sf A. Ad. Gen. i. 400. 

 Imperator, sp -Mow//", azjc^. = Calcar, sp. Fhil. Sand.h. Conch. 



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



bi-ridged operculum. 



286. UvANiLLA (Impeeatob) olivacea, Mawe. 



Trochus olivaceus, Gray in Wood Si'.ppl. p. 16, no. 3, pi. 5. — 

 i7e«. Ic. pi. 13. f. 2, (parva.)—Bre. Conch. Syst. pi. 217, f. 7.— 

 T. (Calcar) ol. J/Z-e. Zeit.f. 3Ial. 1850, p. 171, no. 2S.—Kust. 

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

 do. loc. cit. f. 2, (quasi Fve.) 



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



TJvanilla olivacea, H. Sf A. Ad. Goi. i. 400, pi. G a, 6 b, 6 c. 



= Trochus brevispinosus, Val. Yoy. Yen. (non Lam.) — CJienu, 

 Conch. III. 



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

 1848, p. l%S.—Kust. ^Conch. Cab. p. 93, pi. 4-5, f. 3. 



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

 1850, p. 171, no. 29. 



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

 no. 67.— Xusf. Mart. no. 265, lief. 103, p. 213, pi. 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 Peeve, re-named the latter, which has a red 

 pillar, T. ei-ythrophtlialmus. According however to the type 

 in the collection of Dr. Gray, the red-tinted shell, figured 

 as such by Peeve, is the ti'ue 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 : imibilicus faint red : base covered with obsolete rounded 

 spiral costa?. 



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

 crossed by very numerous, slanting ruga% perpendicular to the 

 labral margin, and generally continued to the periphery. This 

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

 (20 or u])wards) of vaulted tubercles. Base concave within the 



