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In some of the red mud scraped from a tooth of one of the Mastodons at Gorodona, Professor Ehrenberg finds seven Polygastrica and thirteen Phytolitharia, all of them, I believe, with two exceptions, already known species. Akad. zu Berlin" April 1845. The list consists of: POLYGASTRICA. Campylodiscus clypeus. Coscinodiscus subtilis. Coscinodiscus al. sp. Eunotia. Gallionella granulata.

Pleurotomaria granulata, Sowerby. Ferruginous Oolite, Normandy. Pleurotomaria ornata, Sowerby Sp. Ammonites Humphresianus, Sowerby. Ammonites Braikenridgii, Sowerby. Oolite, Scarborough. Ostrea Marshii. One-half natural size. The extinct genus Pleurotomaria is also a form very common in this division as well as in the Oolitic system generally.

This elegant root has not come much into practice among us, though it promises, from its sensible qualities, to be a medicine of considerable utility: it is greatly esteemed by the German physicians as an aperient, corroborant, and sudorific; and preferred by the College of Wirtemberg, by Stahl, Neumann, and others, to sarsaparilla. SAXIFRAGA granulata.

Testa umbilicata, depresso-globosa, subcarinata, solida, radiato striata et subtilissime granulata, flavida; spira late depressa, convexiuscula, apice obtusa; anfractus 6 convexiusculi, ultimo obsolete carinato; apertura lunaris, intus alba; peristoma superne rectum, margine basali margine columellarique sub-reflexis, umbilicus profundus, conspicuus, vix obtectus.

Testa obtecte perforata, lenticulari-depressa, orbicularis, carinata, crassiuscula, superne fulva, radiato-striata, minutissime granulata, carina acuta, superne subcrenulata, basi convexa, nitidissima, griseo-albida, radiatim substriata ad umbilicum declivens; spira convexiuscula; anfractus 5, planulati; apertura angulato-lunaris, intus margaritacea; peristoma simplex, basi incrassatum, ad columellam expansiusculum.