REPORT ON THE ASTEROIDEA, > xxxiii 
Family VIL. Penracrrotip® (Gray), emend. Perrier, 1884. 
Phanerozonate Asterids with unequally developed marginal plates, the superior series 
being frequently masked or hidden in membrane. Abactinal skeleton reticulate. Plates 
with large isolated tubercles or spinelets, or granulose, or covered with membrane. Actinal 
interradial areas with large pavement-like plates, which bear unequal-sized granules. 
Genus 1. Pentaceros, Linck. 
Genus 2. Nidorellia, Gray. 
Genus 3. Ampliaster, Verrill. 
Genus 4. Pentaceropsis, n. gen. 
Genus 5. Culcita, Agassiz. 
Genus 6. Asterodiscus, Gray. 
Genus 7. Choriaster, Liitken. 
Genus 8. Paulia, Gray. 
For a Synopsis of the Genera included in the Family Pentacerotide, see p. 343. 
Family VII. GyMNASTERIIDA, Perrier, 1884. 
Phanerozonate Asterids with unequally developed marginal plates. Abactinal skeleton 
tessellate, the plates being often irregular and only partially contingent. The whole test 
covered with membrane, which may be simple, or granulose, or beset with spinelets. 
Actinal interradial areas with large regular plates, often in isolated serial arrangement. 
Genus 1. Asteropsis, Miiller and Troschel. 
Genus 2. Dermasterias, Perrier. 
Genus 3. Gymnasteria, Gray. 
Genus 4. Tylaster, Danielssen and Koren. 
Genus:5. Porania, Gray. 
Genus 6. Marginaster, Perrier. 
Genus 7. Rhegaster, Sladen. 
Genus 8. Poraniomorpha, Danielssen and Koren, 
Genus 9. Laszaster, n. gen. 
For a Synopsis of the Genera included in the Family Gymnasteriide, see p, 355. 
Family VIII. Asterinip (Gray, 1840), emend. Perrier, 1875. 
Phanerozonate Asterids with small marginal plates, in some forms inconspicuous and 
with their axes convergent. Abactinal skeleton composed of imbricating and usually 
(ZOOL, CHALL, EXP.—PART LI.—1888.) é 
