260 MAZATLAS UNIVALVES 



edge : -witlim it is yello'^isli green, witli two orange projecting 

 teeth, one conical at the nucleus, the other spiral ; with a 

 slightly raised central spu'al line. The moasurementa vary 

 as in the last species ; one of ordinary growth measures 

 long, 'b, 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 dii'ty places on 

 rocks at or a little below half tide level ; strictly marine ; 

 C. B. Adams. — San Miguel ; of extraordinary size ; Lieut. 

 Green. — Mazatlan, Menke.— California [PUpper] Lad?/ Doug- 

 lass, B. j\I.— "Australia ; given by — Metcalf, Esq."* 

 B. M. — Mazatlan ; abundant, sometimes pierced by Gastero- 

 pods ; L'pool S)' Havre Coll. 



Ordinary network pattern ; lilac tinge. — Tablet 1209 contains 

 12 specimens very close pattern. — 1210, 7 do. close. — 1211, 7 do. 

 open. — 1212, 5 do. very open. — Obscureh/ trifasciate. 1213, 

 12 do. very close.— 1211, 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 zigzag pattern. — Tablet 1231 contains 8 sp. inter- 

 mediate. — Grey a:id olive green tinge. 1232, 6 do. light. — 1233, 

 9 do. with black sutural spots.— 1231, 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. — 

 1211, 3 do. mottled.— 1212, 5 do. grey appearing.— 1213, 4 do. 

 very close pattern. — 1211, 4 do. less close. — 1215, 5 do. yellow 

 appearing. — Lilac tinge. 1246, 5 do. dark. — 1217, 5 do. light.— 

 1248, 7 do. vcllow 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, it is probable that they were 

 procured from the Jla^re Col. which was sold piecemeal at the London auctions, 

 without any assiRne I habitat ; and that Mr. Metealf erroneously supposed them 

 to have come from Australia. 



