21 



3. UPPER EOCENE OR JACKSON GROUP. 



SUBKINGDOM PROTOZOA. 



Class RHIZOPODA. 



Order PORAMINIFERA. 



Cyclostlgidae. 



651. Orbitolites (Orbitoides) Mantelli, Morton. Miss. ; Ala. 



Rliiltiloculidae. 



652. Triloculina lineata, Conrad. Miss. 



SUBKINGDOM RAD I AT A. 

 Class POLYPI. 



Order ACTINARIA. 



Turl)iiiolidae. 



653. Plabellum Wailesii, Conrad. Miss. 



AstraBidae. 



654. Osteodes irroratus, Conrad. Miss. 



Madreporidae. 



655. Endopachys expansum, Conrad. Miss. 



Class ECHIiVODERlTIATA. 



Order ECHINOIDEA. 



Sciitellidae. 



656. Mortonia (Periarchus)' altus, Conrad. N. Car. 



657. Mortonia (Periarchus) carolinensis, Conrad. S. Car. 



658. Mortonia (Periarchus) crustuloides, (^Morton) Conrad. S. Car. 



659. Mortonia (Periarchus) marginalis, Conrad. S. Car. 



660. Mortonia (Periarchusl pileus-sinensis, (iZareneO Conrad. S. Car. 



661. Mortonia (Periarchus) planus, Conrad. S. Car. 



' Subgenus Periarchus, Conrad. Description. — Rounded ; apex central ; 

 ambulacra short, open at the ends which are situated about half way be- 

 tween the apex and margin ; ambulacral space tumid ; margin and sub- 

 marsin thin ; anus nearer to the mouth than to the periphery. The typical 

 species of Mortonia (Scutella quinquefaria, Say) is much thicker on the edge, 

 and the anus is situated rather nearer to the periphery than to the mouth. 



