BIOLOGICAL CLASSIFICATION. 1419 



Family Spiriferid/E King. 



Cyrlia Dalman, Reticularia McCoy (subgenus Prosserella Grabau), Spirifer Sowerby 

 (subgenera Deltbyris Dalman, Eospirifer Schuchert). 



Family Suessiixe Waagen. 

 Cyrtina Davidson. 



Family Rhynchospirhxe Hall and Clarke. 



Ilomceospira Hall and Clarke, Rhynchospira Hall and Clarke, Trematospira Hall. 



Family Meristellid^e Hall and Clarke. 



Hindella Davidson (subgenus Greenfieldia Grabau), Hyattidina Schuchert, Merista 

 Suess, Meristella Hall, Meristina Hall, Meristospixa Grabau, Nucleospira Hall, 

 Whitfieldella Hall and Clarke. 



Family Ccelospirid,e Hall and Clarke. 



Anabaia Clarke, Coelospira Hall. 



Family Athyrid^e Phillips. 

 Athyris McCoy. 



Phyllum MOLLUSCA. 

 Class PELECYPODA. 

 Order Prionodesmacea. 



Family Solenomyid^e Gray. 



Clinopistha Meek and "Worthen, Solenomya Lamarck. 



Family Grammysiid^e Fischer. 



Cuneamya Hall and Whitfield, Edmondia Dekoninck, Grammysia Verneuil, Lepto- 

 domus McCoy, Saffordia Ulrich, Sedgwickia McCoy. 



Family Ctenodontid^e Dall. 



Ctenodonta Salter, Nuculites Conrad, Pyrenomceus Hall. 



Family PararciD/E Ulrich. 

 Panenka Barrande. 



Family Ledid.-e Adams. 



Clidophorus Hall, Cytherodon Hall. « 



Family MegalodontiD/E Zittel. 

 Megalomus Hall, Plethocardia Ulrich. 



Family Cyrtodontid/e Ulrich. 



Bodmania Miller, Cyrtodonta Billings, Eschyrodonta Ulrich, Matheria Billings, Orto- 

 nella Ulrich, Sowteria Whiteaves, Vanuxemia Billings, Whitella Dlrich. 



Family Aviculioe D'Orbigny. 



Actinopteria Hall, Avicula Klein, Cliopteria Williams, Leptodesma Hall, Limoptera 

 Hall, Leiopteria Hall, Pahcopecten Williams, Pterinea Goldfuas, Pteronitella 

 Billings, Ptychopteria Hall, Rkombopteria Jackson, Tolmaia Williams. 



Family Ambonychiid-e Miller. 

 Anonychia Ulrich, Ambonychia Hall, Amphicoelia Hall, Anomalodonta Miller, 

 Anoptera Ulrich, Byssonychia Ulrich, Clionychia Ulrich, Ectenoptera Ulrich, 

 Eridony.'hia Ulrich, Mytilarca Hall, Opisthoptera Sleek, Pal i cardia Hall, Pletho 



mytilus Hall, Psilonychia Ulrich, Btreptomytilus Kindle and Breger. 

 84243°— Bull. 92— vol 2—15 45 



