442 MAZATLAN UNIVALVES 



Sab. — ^Norway to Mediterranean, Forbes. — W. Indies, B. M. — 

 {Var. Yod.) Mazatlan ; 3isp. living on Spondjdus, dead on 

 Cliama; L'pool Col. 



Tablet 2027 contains 4 sp. of different ages. The largest 

 possesses its operculum, which appears like that of Chrysallida, 

 but Math the rugte much coarser. Another is broken so as to 

 shew the axis of the upper whirls. 



Family CEEITHIOPSIDiE. 



Genus ;CEEITHI0PSIS, Forbes Sf Hani. 



Br. IIoll. vol. iii. p. 361.— S^. Sf A. Ad. Gen. vol. i. p. 239.— 

 Operculum concentric, nucleus terminal. 



PNon Cerithiopsis, Andre to, Ann. Mag. Nat. Mist. vol. x. p. 105. 



Cerithium, pars, auct. — The position of the following species 

 must of coiu'se remain in abeyance till the animals have been 

 examined, or at least the opercida 'obsexwed. The speci- 

 mens found were not sufficiently numerous to make out the 

 species satisfactorily. 



557. Ceeithiopsis tubeeculoides, n. s. 



C.t. " C. tuherculaio" simili, sed multo minore ; titberculis 

 minorihus ; anfr. v. primis Imvibus, tumidis, suhdiai)hanis, 

 plerumque decollat'is ; anfr. nornialibus, lineis radiantibu.'i 

 usque ad carinam quartam non tuhcrculatam circa peripheriam 

 continuis ; basi iiit.juniore angulatd, sublcBvi ; in t. adultd 

 cannulis ii. tumidioribus ; labia tenuissimo. 



Comp. C. tuberculatum, Mont, in Forbes Sf Sanl. Br. Moll. 



vol. iii. p. 365. 

 Comp. Cerithium Pcruvianum, D'Orb. B. M. Cat. Moll. p. 43, 



no. 375. 



The shell is smaller even than dwarf specimens of the British 

 species, and the tubercles are further apart ; else the full des- 

 cription in the Br. Moll, would apply almost exactly to the 

 Mazatlan shell. The smallest sp. with three normal whirls 

 measures "055 by '027 ; the largest, with seven, long. '15, 

 long. spir. '105, lat. -(XiS, div. 23". 



