260 MAZATLAN UNIVALVES 
edge: within it is yellowish green, with two orange projecting 
teeth, one conical at the nucleus, the other spiral; with a 
slightly raised central spiral line. The measurements vary 
as in the last species; one of ordinary growth measures 
long. °5, lat. °63, div. 130°. 
Hab.—Panama; on a mud bank partially overflowed with 
fresh water ; Cuming.—Do.; on sticks and stones, in a grove 
of trees, a little above half tide level; also in dirty places on 
rocks at or a litile below half tide level; strictly marine; 
C. B. Adams.—San Miguel; of extraordinary size; Lieut. 
Green.—Mazatlan, Menke.—California[? Upper | Lady Doug- 
lass, B. M.— “Australia ; given by — Metcalf, Esq.’* 
B. M.—Mazatlan ; abundant, sometimes pierced by Gastero- 
pods ; L’pool §& Havre Coll. 
Ordinary network pattern ; lilae tinge.—Tablet 1209 contains 
12 specimens very close pattern.—1210, 7 do. close.—1211, 7 do. 
open.—1212, 5 do. very open.—Obscurely trifasciate. 1213, 
12 do. very close.—1214, 12 do. close.—1215, 8 do. open.—1216, 
6 do. very open.—1217, 6 do. colour changing. —Grey tinge.— 
1218, 3 do. extremely light.—1219, 6 do. with rows of dots.— 
1220, 5 do. greenish.—1221, 5 do. spotted suture.— 1222, 7 do. 
darker.—12?3, 3 do. close pattern.—1224, 5 do. obscurely tri- 
fasciate.— Very dark colour. 1225, 4 sp. grey tinge, very close 
markings.—1226, 4 do. close.—1227, 4 do. brown tinge.—1228, 
4,do. purple tinge.—1229, 7 do. nearly black.—1230, 4 do. 
obscurely trifasciate. 
Striped and zigzay pattern.—Tablet 1231 contains 8 sp. inter- 
mediate.— Grey and olive green tinge. 1232, 6 do. light.—1233, 
9 do. with black sutural spots.—1234, 4 do. grey.—1235, 9 do. 
olive appearing.—1236, 5 do. dark striped.—1237, 7 do. light 
olive, fine streaks.—1238, 7 do. broader streaks.—1239, 5 do. 
dark olive, close streaks.—1240, 5 do. more distant streaks.— 
1241, 3 do. motiled.—1242, 5 do. grey appearing.—1243, 4 do. 
very close pattern.—1244, 4 do. less close.—1245, 5 do. yellow 
appearing.—Tzlac tinge. 1246, 5 do. dark.—1247, 5 do. light.— 
1248, 7 do. yellow appearing.— Yellow and greenish tinge. 1249, 
6 do. very light.—1250, 7 do. light.—1251, 6 do. darker.—1252, 
5 do. long stripes.—1253, 2 do. broader. — 1254, 7 do. large 
* Several Mazatlan shells (known by their habit as well as by their species) 
occuring in the B. M. with the above inscription, itis probable that they were 
procured from the Havre Col. which was sold piecemeal at the London auctions, 
without any assigned habitat ; and that Mr. Metcalf erroneously supposed them 
to have come from Australia, 
