1426 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Family ENTOMID^E Jones. 

 Elpe Barrande, Entomidella Jones, Entomis Jones. 



Family CYPRIDINID^ Sarg. 

 Cypridina Milne-Edwards. 



POSITION UNCERTAIN. 

 Faberia Miller. 



Superorder CIRRIPEDTA. 

 Order THORACICA. 



Family LEPIDOCOLEID^J Clarke. 

 Lepidocoleus Faber. 



Family TURRILEPADID^E Clarke. 

 Turrilepas Woodward. 



Family LEPADID^E Darwin. 

 Pollicepes Leach. 



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 HEMIASPID^: Zittel. 

 Pseudoniscus Nieszkowski. 



Order EURYPTERIDA. 



Family EURYPTERID^E Burmeister. 



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

 Pitt, Megalograptus Miller, Onychopterus Clarke and Ruedemann, Stylonurus 

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

 Tylopterus Clarke and Ruedemann. 



Family PTERYGOTID^ Lankester. 

 Hughmilleria Salter, Pterygotus Agassiz. 



Subclass EMBOLOBRANCHIATA. 

 Order SCORPIONIDA. 



Proscorpius Whitfield. 



Phyllum VERTEBRATA. 

 Class PISCES. 



Astraspis Walcott, Ctenopleuron Matthews, Cyathaspis Lankaster, Dictyorhabdus 

 Walcott, Eriptychius Walcott, Onchus Agassiz, Palseaspis Claypole. 



FISH PLATES AND TEETH? (CONODONTS). 



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



