MAZATLAN UNIVALVES 261 
sutural yellow patches.—1255, 7 do. greener.—1256, 7 do. dark- 
er.—1257, 2 do. intermediate. — 1258, 5 do. close grained. — 
1259, 4 do. striped.—1260, 7 do. obscurely trifasciate.—1261, 4 
do. dark close pattern, fine lines.—1262, 5 do. coarser lines.— 
1263, 7 do. mottled pattern.—1264, 5 do. obscurely trifasciate.— 
Olive green tinge. 1265, 5 do. very light.—1266, 7 do. rather 
darker.—1267, 7 do. greyish tinge.—1268, 5 do. darker.—1269, 
7 do. very dark.—1270, 5 do. closer markings.—1271, 8 do. 
obscurely trifasciate. 
Banded variety. Grey tinge —1272, 7 sp. close pattern.— 
1273, 4 do. speckled.—1274, 6 do. band more developed.—1275, 
4 do. band coloured.—Lilae tinge. 1276, 9 do. close pattern.— 
1277, 7 do. greenish band.—1278, 7 do. variable markings.— 
1279, 5 do. open pattern.—1280, 9 do. band margin with broad 
spots.—1281, 10 do. narrow spots.— 1282, 8 do. with white 
lines.—1283, 4 do. without white.—Greenish tinge. 1254, 4 do. 
light, streaked.—1285, 5 do. spotted.—1286, 4 do. large spots.— 
1287, 3 do. broken markings.—1288, 5 do. large zigzag pat- 
tern.—1289, 4 do. band spotted.—Dark colour. 1290, 8 do. 
with yellow flames.—1291, 4 do. fine markings.—1292, 7 do. 
broken pattern.—1293, 5 do. very close grains.—1294, 7 do. 
very dark. 
With black sutural band. Spotted. 1295,3 sp. very light.— 
1296, °5 do. lilac, open pattern.—1297, 5 do. grey.—1298, 4 do. 
close pattern.—1299, 5 do. dark lilac.—1300, 4 do. dark grey.— 
1301, 4 do. very dark.—Striped. 1302, 4 do. very light.—1303, 
9 do. olive green.—1304, 8 do. grey.—1305, 4 do. dark.— Banded. 
1306, 5 do. lilac tinge, speckled.—1807, 6 do. grey.—1808, 4 do. 
striped.—1309, 3 do. lilae and green. 
Tablet 1310, contains 11 sp. shewing variations in form.— 
1311, 18 sp. shewing variations in the mouth. — In all, 607 
specimens, between every two of which there is an appreciable 
difference. The above enumeration gives but a faint idea of 
the variations, fully to display which every specimen must 
have been retained, and to describe which’ would have filled 
a volume. 
Tablet 1312 contains 30 separate opercula; gthers are seen 
in situ, 
