MAZATLAN UNIVALVES 493 



Tablet 2357 contains 6 normal opercula. — 2358, 10 abnormal 

 do. nucleus more or less central. — 2359, 2 do. irregularly 

 repaired after fracture. 



618. PCoLUMBELLA CEKVINETTA, n. S. 



? C. t. parvd, plerumque Icevi, spird suheleoatd, marginihus 

 exeurvatis : colore flavido-fusco, fasciis spiralihus iii. purpureo- 

 fuscis, fascia juxta suturam aurantia ; macuUs rotundatis 

 albis, nisi suturam versits, omnino conspersa. ; anfr. iii. nucleosis 

 Icevihus, compactis ; dein ii. radiatim costatis, costis planatis, 

 parum expressis ; dein iii., nisi lirulis circa basin spiralihus, 

 omnino Icevihus ; anfr. planatis, suturd hand impressd : apertnrd 

 subelanffatd, lahro acuta, vix denticulato ; labia canspicua, Icevi, 

 parum extante. 



Only one specimen was found of tbis very beautifully 

 painted species. In tbe pattern it somewbat resembles Niti- 

 della cribraria ; but tbe spire is distinct. Long. "27, long, 

 spir. -14, lat. -12, c/?t;. 40". 



Sah. — Mazatlan ; 1 fresb sp. ; L'pool Col. 



Tablet 2360 contains tbe specimen. 



618, b. ? COLUMBELLA CEBVINETTA, var. OBSOLETA. 



? C. cervinetta, t. minore, anfr. IcBvihus ii. ; alhidd, rufocas- 

 taneo obscure fasciatd, maculis albis subobsoletis ; labro dentato. 



One young and one adult sp. were found, differing as above ; 

 but tbe similarity of tbe upper wbirls, general pattern and 

 babit, seem to mark tbem as conspecific. Tbe adult measures 

 •19 by -08. 



JIab. — ilazatlan ; 2 sp. off Spondylus ; Upool Col. 



Tablet 2361 contains tbe adult. 



Genus PMETULA, S. Sf A. Ad. 



Gen. vol. i. p. 84. — SbeU resembling Dapbnella. 

 Buccinum (pars) auct. 



619. ? Metula , n. s. {a) 



Tablet 2302 contains a young sbell, witb 4 smooth nuclear 

 and more tban two normal wbirls ; elongated, wbite, very 



March 1857. 1 1 



