BIOLOGICAL CLASSIFICATION. 1411 



Order Tubicola. 



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

 chison, Spirorbis Daudin. 



WORM BURROWS, etc. 



Arenicolites Salter, Arthrophycus Hall, Climactichnites Logan, Da?dalus Rouault, 

 Eugyrichnites Ami, Myrianites MacLeay, Nemapodia Emmons, Nereitea MacLeay, 

 Planolitee Nicholson, Protichnitea Owen, Sabellarites Dawson, Sserichnites Billings, 

 Scolithus Haldeman, Walcottia Miller and Dyer. 



"trails." 



Asaphoidichnns 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;e Neumayr. 

 Holocystites Hall. 



Family Anomalocystid^e Meek. 



Anomalocystites Hall, Ateleocystites Billings, Belemnocystites Miller and Gurley t 

 Dendrocystites Barrande. 



Family Malocystid;e Bather. 



Amygdalocystites BilUngs, Canadocystis Jaekel, Comarocystites Billings, Malo- 

 cystites Billings, Platycystis Miller. 



Order Rhombifera. 



Family Echinosph^eritid^e Neumayr. 

 Echinosphserites Wahlenberg, Paloeoeystites Billings. 



Family Caryocrinid.e Bernard. 

 Caryocrinites Say, Heterocystites Hall, Stribalocystis Miller. 



Family Callocystid;e Bernard. 



Apiocystites Forbes, Callocystites Hall, Cheirocrinus Eichwald, Coelocystis Schu- 

 chcrt, Glyptocystitcs Billings, Hallicystis Jaekel, Hybocystites yfetherby, 

 Jaekelocystis Schuchert, Lepadocystis Carpenter, Lepocrinites Conrad, Pleuro- 

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



chert, Trimerocystis Schuchert. 



Order Diploporita. 



Family Spileronitid/E Neumayr. 

 AUocystitea Miller, Trematoeystis Jaekel. 



Family GomphocystiD/E Bather. 

 Gomphoryslites Hall. 



