18 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



Torus. 



See Oral armature. 

 Trivium. 



See Bivium. 

 Vertebral ossicles. 



In the Ophiuroidea each pair of adjoining ambulacralia is united into a single 

 plate, the vertebra of the arms. As the arms are very flexible, these ossicles 

 articulate upon one another as do the bones in the vertebral column of verte- 

 brates. 



FINDING LIST OF PALEOZOIC STELLEROIDEA. 



Page. 

 Acroura (Ophiura) schlotheimii Miinster. Known to the writer only from the list 

 in Woodward, Geol. Mag., dec. 2, vol. 1, 1874, p. 7. Siluric. 



Agalmaster Schondorf 131 



A. grandis Schondorf 132 



A. intermedius Schondorf 133 



A. miellensis Schondorf 132 



Aganaster Miller and Gurley 263 



A. gregarius (Meek and Worthen) 264 



A. (?) sp. Miller and Gurley =Lapworthur a (.?) sp 251 



Alepidaster Meek 228 



A. flexuosus (Miller and Dyer) 231 



A. granuliferus (Meek) 230 



A. gregarius M.eek=Aganaster gregarius 264 



A. miamiensis (Miller) 233 



A. f, new species 230 



Anorthaster, new genus 125 



A. miamiensis (Miller) 127 



Archaeasterias Muller=Xenasier 129 



? Argaster ^s\\= Mesopalseaster 74 



A. antiqua Gregory = Mesopalxaster (?) antiquus 86 



Aspidosoma Goldiuss= Encrinaster 241 



A. arnoldi Go\diuss= Encrinaster arnoldi 243 



A. eifelense Sch6ndori= Encrinaster ei/elensis 244 



A. goldfussi Sch6ndori= Encrinaster goldfussi 243 



A. grayse S-pencer= Encrinaster (f ) grayse 245 



A. petaloides Simonovitsch^ Encrinaster petaloides 243 



A. petaloides goslariensis Halfar =Encrinasfer petaloides goslariensis 243 



AJ pontis C\arke= Encrinaster pontis 244 



A. roemeri Sch6ndori= Encrinaster roemeri 244 



A. schmidti ^ch.ondori= Encrinaster schmidti 244 



A . tischbeinianum 'Roemer=Encrinaster tischbeinianus 244 



Asterias Graham, Anthony, and James— Petraster (?) americanus 146 



A. acuminatum Simonovitsch= Mesopalaeaster (?) acuminatum 93 



A. anthonii I>a,nsi= Petraster (?) americanus '■ 146 



A. antiqua HiBinger—Lindstromaster antiquus 149 



A. antiqua Troost= Mesopalxaster (?) antiquus 86 



A. antiquata ~Locke=PromopalseasteT speciosics 109 



A. asperula Roemer= JJrasterella aspcrula 188 



A. asperula Roemer {part)=Eoluidia decheni 262 



A. constellata Thorent= Urasterella (f) constellata 187 



A. matutina B.di[l=Hudsonaste)- matutinus 57 



A. montanus Stschurowsky= Urasterella montana 189 



A. primxva Salter and Soweiby =Stenaster (f ) ohtusus 167 



