16 ROYAL SOCIETY OF CANADA 



seven genera are represented by seven species. Protodus jexi and Dolio- 

 dus prohlematicus are Pleuracanthids from Campbellton. Of the 

 Diplacanthidœ we have Climatius laiispinosus, also from Campbellton, 

 and of the Acanthodidae there are Acanthodes semistriatus and Cheira- 

 canthus costeUatus, from the same locality. The Dipnoi are represented 

 by a single species, Phlyctœnaspis acadica, an Arthrodire generically 

 distinct from Coccosteus, with which it was originally classed. Wood- 

 ward has drawn attention to the presence in this species of a pair of 

 hollow, lateral, fixed spines, a feature worthy of special notice. Another 

 species of this order, Macropetaïichthys sullivanti, is questionably repre- 

 sented by small fragments of plates from the Corniferons of Ontario. 

 Of the Teleostomi a single Crossopterygian is indicated by part of an 

 " inter-mandibular crest," from the Corniferons of Ontario, which hag 

 been identified with Newberry's Onychodus sigmoides. Under the 

 designation Tchthyodorulites come Machœracanthus peracutus, M. sulca- 

 tus and Gyracantlvus incurvus from Ontario, Gaspé and New Bruns- 

 wick respectively. 



3. Upper Devonian pauna. — The fauna of the Upper Devonian 

 differs materially from that of the Lower Devonian by the introduction 

 of many new forms. The order Osteostraci is represented by three spe- 

 cies, the order Antiarchi by the very characteristic Upper Devonian genus 

 Bothriolepis. The Elasmobranchs include iVcanthodian fishes of the 

 families of Diplacanthidae and Acanthodidae. In Ptychodus and Bhyn- 

 chodus we have genera of Chimseroids. The Dipnoan fishes are repre- 

 sented . by the genus Scaumenacia of the Sirenoidei, and the genera 

 Çoccosteus, Aspidicthys and Dinichthys of the order Arthrodira. 

 Holopiycliius, Eusthenopteron ^nd Onycliodus are Crossopterygian 

 genera. An advance is made by the introduction of the Actinopterygian 

 genus Cheirolepis. 



Comparing the Upper Devonian fauna with that of the Lower 

 Devonian we find the Ostracoderms augmented by the order Antiarchi. 

 The early forms of the Ichthyotomi mentioned as occurring in the 

 Lower Devonian have no Upper Devonian representatives. Also Chi- 

 mœroid, Sirenoid and Actinopterygian fishes are added to the list. 



Cephalaspis laticeps and Euphauerops longccvus are both from 

 Scaumenac bay. Que., the latter being the only known genus and 

 species of the family of Euphaneropidae. We have the sole representa- 

 tive of the Antiarchi in Bothriolepis canadensis. The type of this 

 particularly interesting genus is B. ornata from the Upper Devonian of 

 Kussia, described by Eichwald in 18-iO. Of the nine species known from 

 England, Scotland, Eussia, Canada and the United States, B. canadensis 

 appears to come nearest to B. ornata and B. liydrophila, Agassiz, 



