456 MAZATLAN UNIVALVES 
Famity TURBINELLIDZ. 
7 Genus TURBINELLA, Lam. 
Journ. Hist. Nat. 1799, pars :—Phil. Handb. Conch. p. 140 :— 
(non Turbinellus, Oken.) 
Cynodonta, Schum. :—Gray Fig, Moll. p. 68, no. 14. 
Vasum, (Bolten,) H. § A. Ad. Gen. i. 155. 
581. TURBINELLA czstTus, Brod. 
Proc. Zool. Soc. 1833, p. 8.— Mill. Syn. Nov. Test. Viv. p. 156.— 
Fve. Conch. Ic. pl. 6, f. 34.—C. B. Ad. Pan. Snells, p. 180, 
no. 149.—Mke. in Zeit. f. Mal. 1851, p. 17, no. 81. 
Vasum cestus, H. & A. Ad. Gen. i. 156. 
=Turbinella ardeola, Val. Rec. Obs. vol. ii. p. 283. (1833.) 
Shell known from the véry similar W. Indian T. muricata 
by the want of the intercalary plait between the large ones, 
which are 4, sharp in the young shell, sometimes flattened in 
the adult. Shell ponderous, covered with a very thick olive 
epidermis in layers of growth. Spire generally eroded. Um- 
bilicus sometimes distinct, sometimes only a chink. Mouth 
marble white. Operculum‘ very small for the shell, thick, 
horny, nearly smooth; unguiculate, much twisted, muscular 
scar corrugated from the terminal nucleus. It was rare in the 
L’pool Col., more common in the Havre Coll., a large number 
of specimens haying,been seen in a London shop with the beau- 
tiful epidermis carefully cleaned off. <A finely grown specimen 
measures long. 4°6, long. spir.1°4, lat. 3°2, div. 90°. The 
largest (with the spire decorticated) measures 5°2 by 3°6, and 
weighs 14 0z. 
Hab.—Bay of Caraccas; in soft mud among rocks ; Cuming.— 
Taboga; on sand beach, near low water mark, very rare ; 
C. B. Adams.—Mazatlan ; not common ; L’pool & Havre Coll. 
Tablet 2073 contains a young, finely grown sp., spire promi- 
nent.—2074, the most perfect sp. with operculum.—2075, the 
largest sp. with operculum.—2076, 1 sp. deformed growth, 
upper teeth much flattened.—2077, 1 sp. the entire spire abra- 
ded; mouth reddish green.—2078, 1 sp. curiously deformed, 
plaits obliterated except one dull callus. 
