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XV111. CONTENTS.<br />

Genus 15?.<br />

Genus 153.<br />

Genus 154.<br />

Genus 155.<br />

Genus 156.<br />

Genus 157.<br />

Genus 158.<br />

Genus 159.<br />

Genus 160.<br />

Genus 161.<br />

Genus 162.<br />

Genus 163.<br />

Genus 164.<br />

Genus 165.<br />

Genus 166.<br />

Genus 167.<br />

Genus 168.<br />

Genus 169.<br />

Genus 170.<br />

Genus 171.<br />

Isodiscus Rattray, 188S .<br />

Rattrayella De Toni, 1889<br />

Debya Rattr. olim, 1S88.<br />

Aporodiscus Rattr., 1888.<br />

Cestodiscus Grev., 1865 .<br />

Perithyra Ehr., 1854<br />

Heterostephania Ehr,, 1851 tubercles very small.<br />

Micropodiscus Grun., 1883<br />

Tribe XXIII. Heliopeltete.<br />

ACTINOPTYCHUS Ehr., I<br />

838<br />

Omphalopelta Ehr., 1844 valves cellular, with compartments alternately<br />

furnished with spines.<br />

Symbolophora Ehr., 1844 valves with angular centre.<br />

Heliopelta Ehr., 1854 valves with margins furnished with spines.<br />

Halionyx Ehr., 1854 valves with rounded centre.<br />

Polymyxus J. W. Bailey, 1885 Valve undulated, without cellular<br />

layer.<br />

Schuetlia De Toni, 1894 valve triangular, with excavated sides.<br />

Debya Pant., 1886 = internal valve of Aciinoptyckus,<br />

? Gyroptychus Ad. Schm., 1890 = a similar internal valve.<br />

Truania Pant., 1886<br />

Actinodiscus Grev., 1863.<br />

Anthodiscus Grove fr Sturt, 1887 .<br />

Actinodictyon Pant., 1889<br />

Lepidodiscus Witt., 18S5 .<br />

Wittia Pant., 1889<br />

Tribe XXIV. Asterolampre/e .<br />

Liostephania Ehr., 1847 (Internal Valves?)<br />

Gyroptychus Ad. Schm., 1890 (Internal Valves of<br />

Actmoptychus.)<br />

Gladogramma Ehr., 1844.<br />

Mastogonia Ehr., 1844<br />

Gyrodiscus Witt., 1885<br />

Group Asterolampra (E/ir., 1844) Char. Emend.<br />

Actinogonium (internal valves of Asterolampra)<br />

Asterolampra Ehr., 1844<br />

asteromphalus ehr., 1 844<br />

Spatangidium Breb., 1857 valve having a basilar ray, narrower, and<br />

passing beyond the centre.<br />

Stelladiscus Rattray, 1890<br />

Asterodiscus Johns., 1852 central ray bifurcated.<br />

Rylandsia Grev., 1S61<br />

Stictodiscus Grev., 1861 .<br />

Arachnoidiscus Ehr., 1849<br />

Page<br />

490<br />

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499<br />

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5 QI<br />

5 QI<br />

502<br />

502<br />

503<br />

54<br />

54<br />

54<br />

55<br />

55<br />

506<br />

50b

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