List of Lov-er Silurian Fossils, Cincinnati Gro^ip. 61 



A CLASSIFIED LIST OF LOWER SILUBIAN FOSSILS, 

 CINCINNATI GROUP. 



By John Mickleborough and A. G. Wetherby. 



ANIMAL KINGDOM 



SUB-KINGD03IS: 



1. VERTEBRATA. L. rere^eftro?. joints of the backbone, or spine. 



2. ANXULOSA. L. annulus, a ring. 



3. ANNULOIDA. L. annulus ; Gr. eidos, form. 



4. MOLLUSCA. L. mollis, soft. 



5. MOLLUSCOIDA. L. mollis ; Gr. eidos. 



6. CCELE^^TEEATA. Gr. koilos, hollow ; enteron, intestine. ' 



7. PROTOZOA. Gr. protos, first ; zoon, animal. 



The remains of vertebrate animals have not yet been found in this 

 formation. The other sub-kingdoms are well represented. 



SUB-KINGDOM ANNULOSA. . 



Class Crustacea. L. crusta, a crust or shell. 



Sub-Class Entomostraca. Gr. entoma, an insect ; ostrakon, shell. 



Order Trilobita. Gr, treis, three ; lobos, lobe. 



Genus Calymmene, Brongniart. Gr. Icelcalymmene, concealed. Named 

 on account of the uncertaiut}' of its zoological affinities. 



1 Cah'mmene senaria, Conrad. L. senarius, six. 



2 Christyi, Hall. 



Genus Acidaspis, Murchison. Gr. aids, akidos, a point or barb-; as]3is, 

 a shield. 



3 Acidaspis Cincinnatiensis, Meek. 



4 ceralepta, Anthony. Gr. keras, a horn ; leptos, slender. 



5 crossota, Locke. Gr. krossotus, fringed. 



6 O'Nealli, S. A. Miller. 



7 anchoralis, S. A. Miller, L. anchoralis, anchor-like. 



Genus Asaphus, Brongniart. Gr. a, not ; saphes, certain. Referring 

 to the uncertain zoological relations of these crustaceans. 



8 Asaphus gigas, DeKay, Gr. gigas, a giant. 



9 megistos, Locke. Gr. megistos, greatest. 



