446 WILLIAM K. GREGORY 



Protoselachii) Parker & Haswell 

 Fam. Notidanidas 



" Chlamydoselachidas 

 Order Prosarthri Gill (" Les Cestraciontes " Agassiz) 

 Fam. Orodontidse 



" Heterodontidae (Cestraciontidas) 

 " Edestidse 



" Cochliodontidas Inc. Sedis » 

 y Order Batidoselachii (nom. nov.) (" Tectospondyli " (Hasse) 

 Smith Woodward) 

 Suborder Cyclospondyli Hasse 2 

 Fam. Spinacidas (Squalidas) 



Subfam. Squalinae, Squalus, (Acanthias), Centrina, Cen- 

 trophorus, Spinax,Centroscyllium 

 Scymninae (Dalatiinae), Scymnus, Somnosus 

 (LfBmargus) 

 " Echinorhininas 

 Suborder Tectospondyli (Hasse) 

 Div. i. Pristes Gill 



Fam. Pristiophoridas 

 " Pristidas 

 Div. 2. Rhinobati (nom. nov.) 

 Fam. Rhinobatidae 



" Tamiobatidae 3 Inc. Sedis 

 Div. 3. Rhinae Gill (?) 



Fam. Rhinidae (Squatinidae) 

 Div. 4. Rajas auct. (Pachyura Gill) 



Fam. Rajidag 

 Div. 5. Torpedines (nom. nov?) 



Fam. Torpedinidae ( = Narcobatidae) 

 Div. 6. Masticura (Gill) 



Fam. Petalodontidae Inc. Sedis 4 

 " Psammodontidas Inc. Sedis 4 

 " Dasyatida? (Trygonidae) 

 " Myliobatidas 

 Order Asterospondyli (Hasse) (Galei, Euselachii) 

 Superfamily Scylliorhinoidea (nom. nov.?) 



Fam. Scylliorhinidag (Scylliidae) 

 Superfamily Lamnoidea (nom. nov.?) 



Possibly allied to the Petalodontidae and Rays (Eastman). 



2 See Jordan, 1905, Vol. I, pp. 545-547. 



3 Devonian, possibly allied to Cestracionts (Jordan). 



4 Possibly allied to Cestracionts but more raylike in dentition. 



