66 Cincinnati Society of Ifatural History. 



Genus Cyclocystoides, Billings and Saltei'. Gr. kuMos, a circle; kus- 

 tis, a bladder; eidos. 



96 Cj'clocystoides raagnus, Miller and Dyer. L. magnus, great. 



97 minus, INIiller and Dyer. L. 7mnus^ less. 



98 parvus. Miller and Dyer. L. parvus, small. 



99 mundulus. Miller and Dyer. L. mundulus, neat. 



100 bellulus, Miller and D3"er. L. bellulus, beautiful. 



Order Asteroidea. Gr. aster, a star; eidos, form. 



Genus PaZoea^^er, Hall. Gr. ^aZrtio.s-, ancient; aster. 



101 Pala?aster Dyeri, Meek. 



102 granulosus, Hall. L. granum, a grain. 



103 incomptus, Meek. L. iticomptas. unadorned. 



104 Jamesi, Dana. 



105 Shafferi, Hall. 



106 simplex, S. A. Miller. L. simplex, simple. 



107 Clarki, S. A. Miller. 



108 spinulosus, Miller and Dyer. L. sjnnulosus, full of little 



spines. 



Genus PalcBasterina., McCoy. Gr. j^ctlaios, ancient; aster, a star. 



109 Paheasterina approximata, Miller and Dyer. L. ajjproximatus, 



near to. 



110 speciosa, Miller and Dyer. L. speciosus, strikingl}' beau- 



tiful. 



Genus Stenaster, Billings. Gr. stenos, narrow; aster. 



111 Stenaster grandis. Meek. L. grandis, large. 



Order Ophiukoidea. Gr. ophis, a serpent; oiira, tail; eidos. 

 Genus Protaster, Billings. Gr. protos, first; aster. 



112 Protaster granuliferus, Meek. L. granum, a grain; fero, I bear. 



113 flexuosus, Miller and Dyer. L,. flexKosiis, tortuous. 



SUB-KINGDOM MOLLUSCA. 



Class Cephalopoda. Gr. kephale, a head; pons, a foot. 



Order Tetkabranchiata. Gr. tetra, four; bragckia, a gill. 



This orderis divided into two divisions, ISfautilidae and Ammon/- 

 tidae. The Cephalopoda of the Cincinnati epoch belong to the ftxmily 

 Nautilidne. The following table from Woodward is an interesting ex- 

 hibit of ancieiit and moileru forms of the two families. 



