456 MAZATLAN UNIVALVES 



FAMILY TUEBINELLID^E, 



GENUS TUREINELLA, Lam. 



Journ. Hist. Nat. 1799, pars :Phil. Handb. Conch, p. 140 : 



(non Turbinellus, OJcen.} 



Cynodonta, Schum. :Gray Fig, Moll. p. 68, no. 14. 

 Vasum, (Bolten,) H. $ A. Ad. Gen. L 155. 



* 



581. TUEBINELLA OESTUS, Brod. 



Proc. Zool. Soc. 1833, p. %Mull. Syn. Nov. Test. Viv. p. 156. 

 Bve. Condi. Ic. pi. 6, f. 34 C. B. Ad. Pan. Snells, p. 130, 

 no. 149. Mice, in Zeit.f. Mai. 1851, p. 17, no. 81. 



Vasum csestus, H. fy A. Ad. Gen. i. 156. 



= Turbinella ardeola, Vol. Bee. Obs. vol. ii. p. 283. (1833.) 



Shell known from the very 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 having^been seen in a London shop with the beau- 

 tiful epidermis carefully cleaned off. A finely grown specimen 

 measures long. 4*6, long. spir.~L'4>, lat.3'2, div. 90. The 

 largest (with the spire decorticated) measures 5*2 by 3*6, and 

 weighs 14 oz. 



Hob. 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 fy 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. < eformed 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. 



