By Meek F.B., Gabb W.M.

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T H E only specimen of this fossil in the collection is a cast of a right valve with the margin of the anterior side broken away. I was at first inclined to think it might be the right valve of the last-described species; but, on a more careful comĀ­ parison, it was found to differ so materially in form, the straightness of its costie, <&c, as to lead to the conclusion that it can scarcely be the right valve of that shell, unless it belongs to an undescribed genus. Hence it has been thought better to view it, provisionally, as a distinct species.

81. SHELL subcircular, convex, inequilateral; beaks prominent, anterior. Cardinal margin rounded in advance, straight and slightly sloping posteriorly, and uniting with the anal margin by a curve. Surface smooth, or marked by a few regular, concentric, rounded ribs. 18 inch. Locality: Star Canon, Humboldt Mining Region. P . DAYTONENSIS, n. s. PL 6, Fig. 32. SHELL flattened, oblique; beak small, not prominent. Cardinal line straight, shorter than the greatest length of the shell. Buccal margin excavated below the hinge-line, convex below, merging insensibly into the base.

It is worthy of note that the outer area is merely rudimentary in small specimens, and probably entirely wanting in very young examples of our species. In speciĀ­ mens of one inch to one and a quarter inches in length there is usually but a single series of these small outer vesicles, rising like little blisters on the inner side of the epitheca between the rays. Farther up from the smaller extremity of the corallite another alternating series is developed upon these, and still higher another, and so on until ten or twelve series are produced in large specimens; beyond which there would seem to have been no farther increase.

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