. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. 126 No. 524. Ammonites perarmatus, Sow. From Oxford clay (Middle Oolite) Calvados, France, and in the private Geo- logical Cabinet of Mr. Ward, Rochester. Diameter, 6. Price, $ No. 525. Ammonites planicostatus, Sow. This small form would appear to belong to the group " Gapricorni," but as it increases in age, it assumes a single row of spines in some instances very largely developed, and thus puts on the character of the group " A
. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. 126 No. 524. Ammonites perarmatus, Sow. From Oxford clay (Middle Oolite) Calvados, France, and in the private Geo- logical Cabinet of Mr. Ward, Rochester. Diameter, 6. Price, $ No. 525. Ammonites planicostatus, Sow. This small form would appear to belong to the group " Gapricorni," but as it increases in age, it assumes a single row of spines in some instances very largely developed, and thus puts on the character of the group " Armati" and becomes the A. Dudressieri, D'Orb. This specimen is a slab covered with numerous shells, and is from the Lower Lias, Dorset. It is now in the private Geological Cabinet of Mr. Ward, Rochester. Diameter 12. Price, $ No. 526. Ammonites refractus, De Haan. Two specimens on slab. This species is remarkable for the manner in which the last whorl loses the spiral and Am- monite-forrn arrangement, reminding us somewhat of a dis- torted Scaphite. It is probably an aberrant form of the group " ; From theMiddle Oolite, Gammelshausen, Wirtemberg. Price, $ No. 527. Ammonites radiatns, Brug. This form is the type of Von Buch's group " Flexuosi" the members of which belong to the Neocomian. From the lower Cretaceous, Auxerre, France, and now in the private Geological Cabinet of Mr. Ward, Rochester. Price, $ No. 528. Ammonites raricostatus, Ziet. From the Lower Lias, Charmouth, England, and now in the private Geologi- cal Cabinet of Mr. Ward, Rochester. Price, $ No. 529. Ammonites Rhotomagensis, Broug. This is the type of the group " Rhotomagenses," the members of which are characterized by having a series of tubercles along the dorsal line in place of a keel. They belong chiefly to the Cretaceous period, From the Lower Chalk Rouen, France, and now in the private Geological Cabinet of Mr. Ward, Roches- ter. Diamet
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfossils, bookyear1866
