List of Lover Silnrian Fossils, Cincinnati Grovp. 73 



Family, Orthonotidce. Gr. orthos, straight; L, 7iota, a mark. 

 Genus, Orthonota, Conrad. 

 2-46 Oi'thonota plioladis, Conrad. Gr. pholas, a boring mollusk. 



Genus Orthodesmn, Hall and Whitfield. Gr. orthos, straight; desma, 



ligament. 



247 Orthodesma contractum. Hall. L. contractus, contracted. 



248 parallelum, Hall. L. paraUelus, parallel. 



249 rectum. Hall and Whitfield. L. rectus, straight. 



250 curvatum, Hall and Whitfield. L. curvatus, curved. 



251 Mickelboroughi, Whitfield. 



252 subovale, Ulrich. L. sub, somewhat; ovalis, oval. 



Genus Sed(jirickia, McCoy. In honor of Prof. Sedgwick, 



253 Sedgwickia compressa. Meek. L. compressus, pressed. 



254 divaricata, Hall and Whitfield. L. divaricatiis, spread apart. 



255 fragilis, Meek. L. fragilis, fragile. 



256 neglecta. Meek. L. ueglectus, slighted. 



257 lunulata, Whitfield. L. lunula, a small moon. 



Family Cardiomorphidae, Hall. Gr. kardia^ a heart; morphe, form. 

 Genus C ardiomorpha, De Koninck. 



258 Cardiomorpha obliquata, Meek. L. obliquatus^ awry. 



SUB-KINGDOM MOLLUSCOIDA. 



Class Brachiopoda. Gr. brancMon, arm; pous, podos, foot. 



" These arms were formerly supposed to take the place of feet. They 

 are, however, essentially breathing organs; consequently the term Bran- 

 rJiiobranchiata (arm-breathers) has been proposed for the erroneous 

 one of Brachiopod'i. (arm-footed)." — W^oodward. 



Prof. E. S. Morse has furnished evidence, from a study of the em- 

 bryonic forms of the Brachiopoda^ to show that this class is nearly 

 related to the Annelida, 



Order Arthropomata. Gr. arthron, a joint; j^orna, a lid or cover. 

 Family Orthidce. Gr. oi tlips, straight. 



Genus Or this, Dalman, 



259 Orthis bellula, James, L. bellulus, beautiful. 



260 borealis, Billings, L. borealis, northern. 



