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238 Nassarms tegnla Reeve San Francisco to Lower California. Western Mud Nassa Plate 2 on % inch in length, moderately heavy, with a heavy, whitish or brown- stained parietal callus. Body whorl smoothish around the middle, but with a spiral row of fairly large nodes below the suture. In the spire, the nodes are usually divided in two. Base of body whorl with a few weak, spiral threads. Outer lip thick. Color olive-gray to brownish, often with a narrow, whitish or purplish, spiral band. A common mud-flat species.

FiciURE 53. Nassa Mud Snails. ATLANTIC: a, Nassarws miibigiiiis Pulteney; b, N. amhigims form co7iseimis Rav.; c, N. acutus Say. PACIFIC: d, A^. vien'diciis Gould; e, N. perpbigiiis Hinds; f, N. iiisciilpws Cpr. All X3.