18 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



Torus. 



See Oral armature. 

 Trimum. 



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 Minister. 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. (?) ep. Miller and Gurley =Lapworthura (f ) ep . 251 



Alepidaster Meek 228 



A. flexuosus (Miller and Dyer) 231 



A. granuliferus (Meek) 230 



A. gregarius Meek= Aganaster gregarius 264 



A. miamiensis (Miller) 233 



A. f, new species -.- 230 



Anorthaster, new genus 125 



A. miamiensis (Miller) 127 



Archaeasterias 'M.\JlleY=Xenaster 129 



? Argaster "0.2^1 Mesopalxaster 74 



A. antiqua Gregory = Mesopalxaster (?) antiquus 86 



Aspidosoma Goldi\i88=Encrinaster 241 



A. arnoldi Goldf\i8s=Encrinaster arnoldi 243 



A. eifelense SchondoTi=Encrinaster eifelensis 244 



A. goldfussi Sch6ndori=Encrinaster goldfussi 243 



A. grayss. Spencer=Encrinaster (?) grayse 245 



A. petaloides SimonovitBch=Encrinaster petaloides 243 



A. petaloides goslariensis Halfar=J!?icrmaser petaloides goslariensis 243 



A.f pontis Cla,Tke=Encrinaster pontis 244 



A. roemeri Schdndori=Encrinaster roemeri 244 



A. schmidti Sch6ndoTi=Encrinaster schmidti 244 



A. tischbeinianum Roemer=Jncrwaster tischbeinianus 244 



Asterias Graham, Anthony, and 3ameB=Petraster (?) americanus 146 



A. acuminatus Simonovitsch= Mesopalseaster (?) acuminatus 93 



A. anthonii Dana=Pefr aster (?) americanus 146 



A. antiqua ILi8mger=Lindstrdmaster antiquus 149 



A. antiqua Troost= Mesopalseaster (?) antiquus 86 



A. antiquata Ijocke=Promopalseaster spedosus 109 



A. asperula Roemer= Urasterella asperula 188 



A. asperula Roemer (pait)=Eoluidia decheni 262 



A. constellata Thorent= Urasterella (?) constellata .' 187 



A. matutina 'BsX\.=Hudsonaster matutinus '. 57 



A. montanus Stschurowsky= Urasterella montana 189 



A. primseva Salter and Soweiby=Stenaster (?) obtusus 167 



