BIOLOGICAL CLASSIFICATION. 1411 



Order TUBICOLA. 



Conchicolites Nicholson, Cornulites Nicliolson, Ortonia Nicholson, Serpulites Mur- 

 chison, Spirorbis Daudin. 



WORM BURROWS, etc. 



Arenicolites Salter, Arthrophycus Hall, Climactichnites Logan, Daedalus Rouault, 

 Eugyrichnites Ami, Myrianites MacLeay, Nemapodia Emmons, Nereites MacLeay, 

 Planolites Nicholson, Protichnites Owen, Sabellarites Dawson, Saerichnites Billings, 

 Scolithus Haldeman, Walcottia Miller and Dyer. 



"TRAILS." 



Asaphoidichnus Miller. (Trail of crustacean possibly.) 

 Ormathichnus Miller. (Supposed to be trail of gastropod.) 

 Petalichnus Miller. (Possibly trail of cephalopod.) 

 Teratichnus Miller. (Possibly cephalopod trail.) 

 Trachonomatichnus Miller. (Possibly trail of cephalopod.) 



Phyllum ECHINODERMATA. 

 Subphyllum PELMATOZOA. 

 Class CYSTOIDEA. 

 Order AMPHORIDEA. 



Family ARISTOCYSTID^: Neumayr. 

 Holocystites Hall. 



Family ANOMALOCYSTID^E Meek. 



Anomalocystites Hall, Ateleocystites Billings, Belemnocystites Miller and Gurley, 

 Dendrocystites Barrande. 



Family MALOCYSTID^ Bather. 



Amygdalocystites Billings, Canadocystis Jaekel, Comarocystites Billings, Malo- 

 cystites Billings, Platycystis Miller. 



Order RHOMBIFERA. 



Family ECHINOSPH^ERITID^] Neumayr. 

 Echinosphrerites Wahlenberg, Palaeocystites Billings. 



Family CARYOCRINID^E Bernard. 

 Caryocrinites Say, Heterocystites Hall, Stribalocystis Miller. 



Family CALLOCYSTID^E Bernard. 



Apiocystites Forbes, Callocystites Hall, Cheirocrmus Eichwald, Coalocystis Schu- 

 chert, Glyptocystites Billings, Hallicystis Jaekel, Hybocystites Wetherby, 

 Jaekelocystis Schuchert, Lepadocystis Carpenter, Lepocrinites Conrad, Pleuro- 

 cystites Billings, Pseudocrinites Pearce, Sphserocystites Hall, Tetracystis Schu- 

 chert, Trimerocystis Schuchert. 



Order DiPLOPORiTA. 



Family SPH^RONITID^E Neumayr. 

 Allocystites Miller, Trematocystis Jaekel. 



Family GOMPHOCYSTID^B Bather. 

 Gomphocystites Hall. 



