MAZATLAN UNIVALVES 257 
Syecimens displaying changes of wrinkles.—Tablet 1185 con- 
tains 2 sp. cross-barred, or ‘L-shaped —1186, 3 sp. curled round, 
P- or B-shaped.—1187, 2 sp. 7-shaped.—1188, 2 sp. obscurely 
F-shaped. — 1189, 2 sp. WY -shaped.—1190, 1 sp. :=-shaped.— 
1191, 2 sp. wrinkles. very slightly developed. 
Tablet 1192 contains 3 abnormal opercula. Normal ones are 
seen with the shells. 
327. Nerita Beenuarni, Réel. 
Petit, Journ. Conch. 1850, vol. i. p. 285.—Rve. Conch. Ic. pl. 12, 
Sprott, 2, 0: 
=Nerita funiculata, Whe. in Zeit. f. Mal. 1850, p. 169, no. 22, 
(dated ‘“ April, 1851.”) 
? = Nerita, sp. ind. a, C. B. Ad. Pan. Shells, p. 205, no. 305. 
Theliostyla Bernhardi, H. & A. Ad. Gen. 1. 380. 
This unpretending, but not inelegant species represents on 
the Pacific coast the common W. Indian N. tessellata,; from 
which it differs in the more numerous spiral ribs and columellar 
granules, and in the irregular style of painting. Shell very. 
variable ; with the spire not a little exserted, or quite flat, the 
expanded labrum very rarely even projecting beyond. Ribs 
more or less numerous, generally scabrous, sometimes nearly 
smooth; on shells of the same size, they vary from 2 to 51m 
the tenth of an inch. Colour black, very irregularly spotted 
with a variable number of granules, sometimes large, sometimes 
small: teeth 4, very small and central, sometimes running into 
lines on the lip, sometimes conspicuous, sometimes nearly 
obsolete. Operculum ashy, very finely shagreened outside, 
with a horny layer outside the outer edge, and an inner sinus 
nearer the middle than in the last species. Tooth scarcely 
recurved. The largest specimen measures long. ‘54, lat. 59, 
div. 120°—180°. 
Hab.—Peru, Cuming.— Panama; in extreme profusion, on 
rocks and stones from half-tide level to the low water mark 
of neap-tides; C. B. Adams.—S. W. Mexico, P. P. C._— 
Mazatlan ; not uncommon; L’pool & Havre Coll. 
Tablet 1193 contains 7 sp. various ages.—1194, 7 do. shewing 
variations in colour.—1195, 6 do. varying in height of spire.— 
1196, 6 do. young, shewing variations in sculpture.—1197, 6 do. 
varying in closeness of ribs.—1198, 10 do. shewing changes in 
the Jabial teeth and granulations.—1199, 6 separate opercula ; 
others being in the shells. 
