356 Forty-second Report 



Genus 7 : 



Homalonotus. 



Family b : 



Bronteidee. 



Genus 8 : 



Bronteus. 



Family c : 



Phacopidse. 



Genus 9 : 



Phacops. 



Genus 10 : 



Dalmanites. 



Subgenus 1 : 



Hausmannia. 



Si ihnPYt ti a • 

 ioUsVyviiu.i> & . 



V_VL/ 1 ' 'LL Ul ci, 



Subgenus 3 : 



Cryphaeus. 



Subgenus 4 : 



Odontoeephalus. 



Subgenus 5 : 



Chasmops. 



jcamxiy a . 



A.cidaspici96 . 



Genus 11 : 



Acidaspis. 



Family e: 



Lichadse. 



Genus 12 : 



Lichas. 



Subgenus 1 : 



Terataspis. 



Subgenus 2 : 



Conolichas. 



SiihnPii n q • 



J-LUpiUllCLlcla. 



Subgenus 4 : 



Arges. 



Subgenus 5 : 



Ceratolichas. 



Subgenus 6 : 



Dicranogmus. 



Family f: 



Proetidse. 



Genus 13 : 



Proetus. 



Gen»s 14: 



Phaethonides. 



Genus 15 : 



Cyphaspis. 



Subclass B: 

 Order IV: 

 Family a : 

 Genus 16 : 

 Order V: 

 Family a : 

 Genus 17 : 

 Genus 18 : 



Subclass C. 

 Order VI: 

 Family a : 

 Genus 19 : 

 Genus 20 : 

 Genus 21 : 

 Genus 22 : 



Family b : 

 Genus 23 : 

 Family c : 

 Genus 24 : 

 Family d : 

 Genus 25 : 

 Genus 26 : 



Order VII: 

 Family a : 

 Genus 27 : 



MEROSTOMATA. 



XlPHOSURA. 



Limulidee. 



Protolimulus. 



EURYPTERIDA. 



Eurypteridse. 

 Eurypterus. 

 Stylonurus. 



M ALACOST RACA. 



Phyllocarida. 

 Oeratiocaridse. 

 Ceratiocaris. 

 Echinocaris. 

 Elymocaris. 

 Tropidocaris. 



Pinacaridee. 



Mesothyra. 

 Bhinocaridse. 



Rhinocaris. 

 Discinocaridse. 



Spathiocaris. 



Dipterocaris. 



Decapoda. 

 Carididse. 

 Palaeopalaemon. 



III. Chronological Distribution. 



Oriskany Sandstone. 

 In the eastern outcrops of this formation but a single Crusta- 

 cean species is known, the gigantic Homalonotus major, from 

 Ulster county. In the western extension of these rocks into the 

 Province of Ontario, are the species Phacops cristata, Dalmanites 

 (Hausmannia) pleuroptyx and Dalmanites (Chasmops) anchiops, all 

 of which occur in the overlying Upper Helderberg limestones, a 

 fact which indicates the close alliance of the western Oriskany 

 fauna to the true Devonian. 



Upper Helderberg Group. 



Cauda-galli Grit. 

 No Crustacea have been found in this formation. 



