MAZATLAN UNIVALVES 2C^ 



slightest doubt, having carefully examined about 11,000 speci- 

 mens, from which those here enumerated were selected by a 

 carefully repeated process of reduction and comparison. No 

 very yoimg shells were found ; the youngest measuring '5 in. 

 in length ; the largest, lontj. 1'56, lat. 1"33, alt. '39. 

 JIab. — Mazatlan ; in extreme profusion ; L'pool Sf Savre 

 CoZ^.— Central America, Cuminq, Hinds, KellaU.—9'PsLnama, ; 

 on and under stones at neap tide low water mark, rare ; 

 C. B. Adams. — (A. seruginosa. Mid. non Rve. Conch. Ic. pi. 16, 

 sp. 38) Bodejas, Wosnessenski. — (A. striata, Rve.) Gallapagos, 

 Cuming. — (A. personoides) Kenai Bay, Wosnessenski. 

 Tablet 945 contains 28 specimens in the normal state, outside 

 striped, with a prevadiug greenish tinge, and regularly tessel- 

 lated margin. — 946, 26 sp. do. outside tessellated. — 947, 27 sp. 

 do. prevailing brownish tinge ; more often worn outside. — 

 948, 5 sp. the same, tessellated. — 949, 12 sp. yellowish ground ; 

 broad streaks of brown. — 950, 6 sp. do. narrow streaks. — 951, 

 6 sp. do. scarcely rayed. — 952, 12 sp. do. tessellated. — 953, 4 do. 

 greenish tinge. — 954, 6 sp. border with broad patches of dark, 

 narrow ,of light, green inside ; yellow ground. — 955, 6 sp. do. 

 light ground. — 956, 6 sp. do. tessellated. — 957, 6 sp. brownish. — 

 958, 8 sp. broad dark margin, interrupted by narrow light 

 rays ; brownish cast. — 959, 10 sp. green cast. — 960, 4 sp. hght 

 border ; brown, hnely rayed with white. — 961, 9 sp. do. faintly 

 mottled. — 962, 2 sp. do. with purplish tinge. — 963, 8 sp. do. 

 with narrow brown dotted edge. — 964, 9 sp. do. green tinge, 

 mottled with brown. — 965, 4 sp. do. green margin, scarcely 

 tipped with brown. — 966, 4 sp. do. very light. — 967, 1 sp. do. 

 nearly white. — 968, 4 sp. do. with dark brown edge. — 969, 8 sp. 

 margin nearly uniform ; dark, witli a iew white rays. — 970, 

 8 sp. do. scarcely mottled with white. — 971, 12 sp. do. lighter 

 tint. — 972, 9 sp. margin uniform, ( = P. striata, jun. Rve. not 

 Quoy,) dark green. — 973, 11 sp. do. intermediate. — 974, 9 sp. 

 brown. — 975, 8 sp. of distorted growth ; of Mbichone has made 

 a series of raised laminae, another a fresh margin greatly con- 

 tracted. — 976, 5 sp. shewing the exterior ; tessellated. — 677, 

 7 sp. do. abounding in white. — 978, 3 sp. do. striped — 979, 4 sp. 

 do. pattern changing. — 980, 4 do. dark green var. — In all 301 

 specimens, of which no two are exactly alike. 



. 264. AcMiEA FASCICULAEIS, Mke. 



Zeit.f. Mai. 1851, p. 38, no. 134. 



+ Acmaea mutabilis (pars quidem jun.), Zcit. f. Mai. 1851, 

 p. 37, no. 133. 



May 1856. t 



