304 MAZATLAN UNIVALVES 



354. Veemetps ebuenetts, Roe. 



V. t. alhd, seu ruhro-fusco tincta, satis magna ; anfr. spirali- 

 bus albis x.-xiv. ; primis iii. valde rotundatis, IcBvibics ; dein 

 carina una acutd, dein duabus, postea tribus monstrantibus, 

 quarum una circa peripheriam major ; postea subito irregulart, 

 anfr. separatis, vix spiralibus, marginibus plerumq;ue valde 

 divergentibus, parum seu ad sese, seu ad concham alienam. 

 affi,ocis ; spiraliter teniie et confertim striata, costis intei-dum 

 subobsoletis ; adulta interdum rufo-fusco tincta. 



Operculo extus concavo ; foliis plurimis tenuibus alterd intus 

 alteram sita ; radiatim tenuissime striulato, striularum inter- 

 .ititiis punctulatis ; intus marginem versus convexo, opaciore, 

 margine tenuissimo ; cicatrice circulari, trienti latitudinis haud 

 (Bquante, lirulis circiter xii. concentriris ornato, 

 Proc. Zool. Sac. 1842, p. 197 -.—Conch. S^st. vol. ii. p. 46, 



pi. 152, f. 2. 



Comp. Vermetus pellucidus, Brod. 8( Soto. Zool. Journ. vol. iv. 



1829, p. 369. " V. t.pellucidd, longitudinaliter striata, apicem 



versus carinatd." (This description -vrill suit the young of 



V. eburneu.s, but is not sufficiently explicit for certainty.) 



The operculum is described from specimens in Mr. Cuming's 



collection, which are believed to be authentic, as they agree 



with that of V. Hmdsii in the B. M,, though differing essentially 



from the figure professing to be of that species in S. ^* A. Ad. 



Gen. pi. 88, f. 8, a, b. An operculum agreeing even in the 



peculiar microscopic markings is seen in Mus. Cum. in a very 



different shell, which has lost its apex, but is probably an 



Aletes, and s not unlike A. squamigerus. The V. Hiudsii 



seems to diffcir from V. eburncus in the arrangement of the 



keels on the turritelloid portion. 



About 30 young specimens of this very beautiful species 

 were obtained on Cham.T and Spondyli ; but only two were 

 found adult, loosely entwined on a Chama. These, having 

 passed through the acid process, have lost their sculpture and 

 would hardly be known from .A . ccntiquadrus, (with which 

 the later whirls agree in colour,) but for the Turritelloid 

 apices, which have fortunately survived. The sudden contrast 

 between the elegantly chiseled, alabastrine Pseudo-Turjitella, 

 and the irregular, almost smooth subsequent whirls, is very 

 remarkable. A fossil species found by Mr. Kuttall at New- 

 burn, N. Carolina, differs essentially from the Atlantic species, 

 and offers no marks by which it has been distinguished from this. 



