474 MESOZOIC TIME — REPTILIAN AGE. 



Characteristic Species. 

 1. Protozoans. — Rhizopods. — Textilaria Missouriensis, T. globulosa, Pha- 

 neroatomum senartum, Rotalia lenticulina, R. senaria, Grammostomum phyllodet, 



Figs. 750, 751 A, B. 



51 A 



51 B 



RHIZOPOD.— Fig. 750, Orbitolina Texana. Brachio pods.— Fig. 751 A, Terebratulina plicata; 

 751 B, Terebratula Harlani. 



from the Cretaceous of the Upper Missouri, identified by Ehrenberg ; Cristel- 

 laria rotulata, Dentalina pulchra Gabb, etc., from New Jersey; fig. 750, Orbito- 

 lina Texana Roemer, from Texas, a species having the form of a disk, slightly 

 conical. 



2. Radiates. — (a.) Polyp-Corals. — Astrocoenia Sancti-Sabse Roemer, Texas; 

 Montlivaltia Atlantica, New Jersey, etc. 



(6.) Echinoderms. — Holaster simplex; Ananchytes ductus, Toxaster elegans ; 

 also species of Diadema, Hemiaster, Holectypus, Cyphosoma, etc. 



3. Mollusks. — (or.) Bryozoans. — Numerous species have been described 

 and figured by Gabb & Horn, of the genera Membranipora, Flustrella, Escha- 

 ripora, Biflustra, etc. 



(6.) Brachiopods. — Fig. 751 A, Terebratulina plicata ; fig. 751 B, Terebratula 

 Harlani Morton, from' New Jersey; Lingula nitida M. & H., Nebraska. 



(c.) Conchifers. — Fig. 753, Ostrea Larva Lamarck, found also in Europe; 0. 

 congesta Conrad, from Arkansas and Nebraska ; fig. 752, Exogyra arietina 

 Roemer, from Texas ; fig. 754, E. costata Say, from the Cretaceous of the Atlan- 

 tic and Gulf borders; fig. 755, Gryphsea vesicnlaris Lamk., at nearly all North 

 American localities, and also a European species ; fig. 756, G. Pitcheri Morton, 

 from Cretaceous region west of the Mississippi River ; fig. 757, Inoceramus pro- 

 blematicus Schlotheiin, from west of the Mississippi, and also a European species. 

 Among Rudistes, Radiolites Austinensis Roemer, a species five to six inches 

 in diameter, from Alabama, Mississippi, and Texas; Radiolites lamellosus 



