1426 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Family Entomida Jones. 



Elpe Barrande, Entomidella Jones, Entomis Jones. 



Family Cypridinida Sars. 

 ( 'ypvidina Milne-Edwards. 



POSITION UNCERTAIN. 

 Faberia Miller. 



Lepidocoleus Faber. 

 Turrilepas Woodward. 

 Pollicepes Leach. 



Superorder CIRRIPEDIA. 

 Order Thoracica. 



Family Lepidocoleid;e Clarke. 



Family Ttjrrilepadida Clarke. 



Family Lepadida Darwin. 



Superorder MALACOSTRACA. 



Division Phyllocarida. 



Family Ceratiocarid.-e Salter. 

 Caryocaris Salter, Ceratiocaris McCoy. 



Family Echinocarid;e Clarke. 

 Aristozoe Barrande, Emmelezoe Jones and Woodward. 



Class ARACHNIDA. 



Subclass Merostomata. 



Order Synxiphosura. 



Family Hemiaspida Zittel. 

 Pseudoniscus Nieszkowski. 



Order Eurypterida. 



Family Eurypterida Burmeister. 



Dolichopterus Hall, Echinognathus Walcott, Eurypterus Dekay, Eusarcus Grote and 

 Pitt, Megalograptus Miller, Onycbopterus Clarke and Ruedemann, Stylonurus 

 Page (subgenera Ctenopterus Clarke and Ruedemann and Drepanopterus Laurie), 

 Tylopterus Clarke and Ruedemann. 



Family Pterygotida Lankester. 



Hughmilleria Salter, Pterygotus Agassiz. 



Subclass Embolobranchiata. 

 Order SCORPIONIDA. 



Proscorpius Wliitfield. 



Phyllum VERTEBRATA. 

 Class PISCES. 



Astraspis Walcott, Ctenopleuron Matthews, Cyathaspis Lankaster, Dictyorhabdus 

 Walcott, Eriptychius Walcott, Onchus Agassiz, Palseaspis Claypole. 



PISH PLATES AND TEETH ? (CONODONTS). 



Drepanodus Pander, Polygnathus Hinde, Prioniodus Pander, Distacodus Einde. 



