MAZATLAN UNIVALVES 995 
zebrina, D’ Orb. 1842, B. WM. Cat. Cuba. Moll. p. 23, no. 256. 
(Jamaica, C. B. Adams ; Guadaloupe, D’ Orbigny ; Cuba, 
Sagra.) 
This beautiful shell closely resembles the W. Indian species. 
Like many of its congeners, it has parallel diagonal lines of 
colour ; and is also variously and most beautifully stained with 
red and brown. The first whirl of the five is discoidal. It is 
characterized by extremely minute wrinkling over the whole 
surface, only discernible under the microscope, when quite 
fresh. The umbilicus is very large when young, and sharply 
keeled: when adult, it is often nearly filled up by the callous 
labium. Operculum radiately wrinkled over a large part of 
the outer surface ; within, spire produced, sharply keeled. The 
largest specimen measures fee s13)> lad: 12,5 den., 10° 
The smallest.sp. ,, [0325 LOS Tas 4 90% 
Hab.—Payta, Panama, /. B. Sane —Mazatlan; 12 sp. 
among alge, on Uvanilla olivacea, &e.; ZL *pool Col. 
Tablet 1084 contains 5 specimens eee the principal 
varieties of colour, red, ashy and mottled, the largest of which 
has its operculum in situ ; also 2 separate opercula. 
283 6. PHASIANELLA ? PERFORATA, var. STRIULATA. 
P.t.“ P. perforate” simili, sed lineis coloris carente ; rufo 
punctata et varie maculata ; striis spiralibus intus wmbilicwm 
et in basim, nonnunquam supra spiram. 
Only two dead shells having been found agreeing in the 
above characters, their specific value cannot be tested. One 
of the specimens is very slender, the other of the ordinary 
form. There is no trace of the minutely wrinkled surface. 
Long. 09, lat. °07, div. 50°. 
Hab.—Mazatlan ; 2 sp. in shell washings; L’pool Col. 
Tablet 1085 contains the slender specimen. 
284. PHASIANELLA comptTa, Gould, ms. 
“Ph. t. parva, solidd, ovato-conicd, imnperforatd, politd, cin- 
erascente, lineis minutis olivaceis, oblique volventibus, ornata ; 
anfr actibus i lv. [v.] rotundatis, ultimo ad peripheriam subangu: 
lato, et interdum tessellatim fasciato ; aperturd circulart ; 
labro tenut, albo ; columella planulaté, alba ; faucibus calle 
incrassatis,” 
