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MESOZOIC AND CENOZOIC ECHINODERMATA OF THE TTNITED STATES. 

 Geologic distribution of the Mesozoic Echinodermata of the United States. 



Lower 

 Creta- 

 ceous. 



Upper 

 Creta- 

 ceous. 



Crinoidea: 



Dieyclica — 



Inadunata — 



D end ro crinoidea — 

 Pentacrinida? — 



Isocrinus smithi Clark 



Isocrinus californicus Clark 



Isocrinus sp 



Isocrinus knighti Springer 



Pentacrinus asteriscus Meek &. Hayden . 



Pentacrinus whitei Clark 



Pentacrinus shastcnsis Clark 



Pentacrinus tehamaensis ''lark 



Pentacrinus bryani Gabb 



Encrinida?— 



Encrinus hyatti Clark 



TJintacrinida? — 



Uintacrinus socialis Grinnell 



Marsupitida? — 



Marsupites americanus Springer 



Flexibilia — 

 Pinnata — 



Bourguetiicrinidee— 



Rhizocrinus alabamensis de Loriol 



Rhizocrinus cylindricus Weller 



Stelleroidea: 

 Asteroidea — 



♦Phanerozonia — 



Astropectininse — 



Astropeclen (?) montanus Douglas 



Pentagonasteridse — 



Pentagonaster browni Weller 



Atheneida? — 



Goniaster mammillata Gabb 



Pentacerotida? — 



Pentaeeros asperulus Clark 



Cryptozonia— 



Asteriidas— 



Asterias (?) dubium "Whitfield 



Ophiuroidea — 

 Zygophiura? — 



Opiuolepididse— 



Ophioglypha ulahensis Clark 



Ophioglypha texana Clark 



Ophioglypha bridgerensis (Meek) 



Amphiuridse — 



Aspidura (?) idahoensis Clark 



Echinoidea: 



Regular ia endobranchiata — ' 

 Cidaroidea — 



Cidarida?— 



Cidaris shastcnsis Clark 



Cidaris dilleri Clark 



Cidaris californicus Clark 



Cidaris tavlorensis Clark 



Cidaris pliimascnsis Clark 



Cidaris tehamaensis Clark 



Cidaris texanus Clark 



Cidaris walcotti Clark : 



Cidaris splendens Morton 



(?) Cidaris dixiensis Cragin 



Cidaris nahalakensis de Loriol 



Leioeidaris hemigranosus (Siiumard) . . . 

 Regularia ectobranchiata — 

 Diademoidea — 

 Calycina— 



Saleniidse — 



Salenia texana Credner 



Salenia tumidula Clark 



Salenia bellula Clark 



Arbacina — 



Hemicidaridse — 



Hemieidaris intumescens < lark 



Hypodiadema elcgans Clark '. 



"Goniopvgus zitteli Clark 



Leptarbacia argutus Clark 



Diademina — 



Orthopsodae — 



Orthopsis planulata Clark 



Orthopsis oceidentalis Cragin 



Diadematidre — 



Pseudodiadema emersoni Clark 



Pseudodiadema tcxanum (Roemer) 



Pseudodiadema diatretum (Morton) . . . 



Heterodiadema oniatuin Clark 



Cottaldia rotula Clark 



Hemipedina charltoni Cragin 



Biplopodiida? — 



Diplopodia tatli Cragin 



Diplopodia streeruvitzi Cragin 



Pedinida? — 



Stomechinus hyatti Clark 



C y phosomat i d re — 



Cyphosoma billi Clark 



Cyphosoma texanum Roemer 



Cyphosoma volanum Cragin 



