. College collection of palaeontology. No. 426. Hemicidaris intermedia, Fleming. This large, depressed genus belongs to the Cidari- dce with narrow ambulacra. The distinctive feature is the existence of small tubercles on the lower half of the ambulacra. The spines are cylindrical and finely striated. From the Oolite of Calne (Wiltshire), No, 427. [842, Cast]. Hemipneustes radiatus, Agass. This is a heart-shaped, inflated Urchin, as high as broad, and nearly perpendicular in front, where there is a deep, narrow furrow. The ambulacral summit is central; the ambu- lacra are very large

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. College collection of palaeontology. No. 426. Hemicidaris intermedia, Fleming. This large, depressed genus belongs to the Cidari- dce with narrow ambulacra. The distinctive feature is the existence of small tubercles on the lower half of the ambulacra. The spines are cylindrical and finely striated. From the Oolite of Calne (Wiltshire), No, 427. [842, Cast]. Hemipneustes radiatus, Agass. This is a heart-shaped, inflated Urchin, as high as broad, and nearly perpendicular in front, where there is a deep, narrow furrow. The ambulacral summit is central; the ambu- lacra are very large and winding; the tubercles small, and the anus is on the posterior bor- der. From the Upper Chalk of Maestricht, Holland, and now in the Ward Collection, University of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward's Natural Science Establishment, inc. Rochester

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1901