272 NEW YORK STATE MUSEUM 



Orthis keokuk see Derbya keokuk 

 Orthis laurentina see Billingsella (?) laurentina 

 Orthis lenticularis see Dalmanella elegantula 

 Orthis leonensis see Dalmanella leonensis 

 Orthis leucosia see Rhipidomella leucosia 

 Orthis limit a.r is see Liorhynchus limitare 

 Orthis 1 i v i a see Rhipidomella livia 

 Orthis multistriata see Schizophoria multistriata 

 Orthis oblata see Rhipidomella oblata 

 Orthis peloris see Rhipidomella peloris 

 Orthis penelope see Rhipidomella penelope 

 Orthis perelegans see Dalmanella perelegans 

 Orthis perversa^ Orthothetes perversus 

 Orthis praeumbonaj^ Ambocoelia praeumbona 

 Orthis quadrans see Dalmanella quadrans 

 Orthis quadricostata see Liorhynchus quadri- 

 costatum 



Orthis (?) saffordi Hall & Clarke 



1658 -S-ap. TYPE Orthis? saffordi Hall & Clarke. Paleontology 



of New York. 1892. v. 8, pt i, p. 340, pi. 5A, fig. 38-40. 

 Hall & Clarke. i4th annual report of the New York 



state geologist. 1895. pi. 4, fig. 10 12. 



Trenton limestone Knoxville, Tenn. 



James M. Safford, donor 

 Orthis semele see Rhipidomella semele 

 Orthis stonensis see Dalmanella stonensis 

 Orthis subumbona see Spirifer subumbonus 

 Orthis thiemei see Rhipidomella sp. 

 Orthis ti o ga, see Schizophoria tioga 

 Orthis umbonata see Ambocoelia umbonata 

 Orthis vanuxemi see Rhipidomella vanuxemi 

 Orthisina arctostriata see Orthothetes che- 



mungensis var. arctostriata 



ORTHOTHETES Fischer de Waldheim 



Orthothetes becraftensis Clarke 



1659 3JLS.& TYPE: PLASTOTYPE Orthothetes becraftensis 



Clarke. New York state museum memoir 3. 1900. 

 p. 5 1, pi 7, fig. 16. 



Oriskanian Becraft mountain, Hudson N. Y. 



