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 CERVINETTA, 7. 8. 
20. t. parva, plerumque levi, spird subelevatd, marginibus 
excurvatis : colore flavido-fusco, fasciis spiralibus i. purpureo- 
fuscis, fascia juxta suturam aurantid ; maculis rotundatis 
albis, nist suturam versus, omnino conspersa ; anfr. 1. nucleosis 
levibus, compactis ; dein i. radiatim costatis,-costis planatis, 
parum expressis ; dein i1., nisi lirulis circa basin spiralibus, 
omnino levibus ; afr. planatis, suturd haud impress: apertura 
subelongaté, labro acuto, vix denticulato ; iabio conspicuo, levi, 
parum extante. 
Only one specimen was found of this very beautifully 
painted species. In the pattern it somewhat resembles Niti- 
della eribraria ; but the spire is distinct. Long. °27, long. 
spir. °14, lat. °12; dav. 40°. 
Hah.—Mazatlan ; 1 fresh sp.; L’pool Col. 
Tablet 2360 contains the specimen. 
618, 6. ? COLUMBELLA CERVINETTA, var. OBSOLETA. 
? OC. cervinetta, t. minore, anfr. levibus uu. ; albidd, rufocas- 
taneo obscure fasciatd, maculis albis subobsoletis ; labro dentato. 
One young and one adult sp. were found, differing as above ; 
but the similarity of the upper whirls, general pattern and 
habit, seem to mark them as conspecific. The adult measures 
‘19 by 08. 
iHab.—Mazatlan ; 2 sp. off Spondylus ; L’pool Col. 
Tablet 2361 contains the adult. 
Genus PMETULA, 4H. & A. Ad. 
Gen. vol. 1. p. 84.—Shell resembling Daphnella. 
Buceinum (pars) auct. 
619. P Meruba 
Tablet 2362 contains a young shell, with 4 smooth nuclear 
and more than two normal whirls ; elongated, white, very 
March 1857, tt 
—, n. s. (a) 
