India panna, Spongiose free, globular form, with an even rounded surface. Specimens vary between 6 and 13 mm. in diameter, but in a large proportion of specimens seen the diameter varies but little from 7 or 8 mm. The radiating canals are a little smaller than in the common H. sphaeroidalis, Dunc an., of the Mi'ayara, living, as a rule, not over 0.25 mm. in diameter. H. sigualalis Which, from this form in sponge beds of the Trenton limestone at Dixon, Illinois, is larger and long as its name very indicates, radiating canals of very un equal size. This species (H. parra) has been known to me for nearly ten years as one of the most persistent fossils of the Trenton group in the west ern States. I meet with it first at several localities in central Kentucky and other hand found it) yielding at about the same height in Tennessee Min- nest and Wisc oning though a common fossil kind of gen- eral are rare, Occasional are meet, as t specimens I has n a direct related species in the middle beds of the Cincinnati group. There are a little larger than the Trenton form, the speci cimens averaging about 10 mm. in diameter. This sup- persed variety of it, parra, has been found on the hills about Cincinnati, Ohio, at Culby and McKinney's in central Kentucky; and at Saranah, Ill., formerly I supposed it might be identical with Miller an. Dyer Microporia gregina (Jour. Geol. Soc. N.Y. Hist. vol. 5, p. 37, 1878) but its external structure is clearly the same as that of H.india. Three authors take of their species that its structure is "firm on a minutely porous, and very compact" and that at section reveal "needle-shaped bodies" referred by them to be speci-mes. From this it is evident that unless they are mistaken in their diagnosis as they had a very different specimen than their supposed variety of H. parra was collected from the upper beds of the Cincinnati group near Malden, Ill.