The Primitive Fishes 



277 



Tomodiis convexus, Deltoptychhis acutus, Cladodiis inira- 

 bilis, Helodus and Petalodiis. 



(3) In the roof of Splint Coal at Newmains (p. 92) 

 occurred : of elasmobranchs Gyracanthiis, Ctenacanthiis, 

 Orthacanthiis cylindricus, Climaxodus (Janassa) imbricat- 

 us ; the dipnoans Qtenodus imbricatus and C. tuberculatiis 

 with various other fish remains; while a light colored shale 

 just above contained Sigillaria. 



(4) Near Newtown (p. 88) the roof-shale of the 

 Splint coal has yielded Orthacanthus cylindricus, Diplodus 

 gibbosus, Ctenacanthiis brevis and C. major. 



The first, third and fourth are freshwater, the second 

 is marine. Many other equally instructive combinations 

 are given. 



We would refer next to two papers (20^:32:332; 

 35 : 181 ) by J. W. Davis in which is described "a thin stra- 

 tum of shale known to extend over an area of several miles, 

 immediately above the Better-bed Coal in the neighbor- 

 hood of Clifton and Low Moor, S. E. of Halifax," and 

 which varied from a quarter to three-eighth inch in thick- 

 ness. It " is almost entirely composed of the fragmentary 

 remains of fishes and labyrinthodonts." The following 

 selachians are enumerated in the earlier paper, and all of 

 them we would regard as freshwater, since they occur with 

 labyrinthodont remains, also with freshwater ganoids, while 

 the same fishes also occur in many localities always associat- 

 ed with plants, freshwater molluscs, etc. : 



Elasmobrajichs. 



Gyracanthus formosus 

 Gyracanthiis tuberctilatus 

 Ctenacanthiis hybodoides 

 Ctenacanthus sp. 

 Lepracanthus colei 

 Acantltodes ii-ardi 

 Pleuracanthus laevissimus 

 Orthacanthus cylindricus 

 Diplodus gibbosus 

 Hoplonchus sp. nov. 

 Pleiirodus rankinii 

 Pleurodus affinis 

 Helodus simplex 

 Cladodus mirabilis (anad. 

 Petalodiis hastingsiae 

 Ctenoptychius apical is 



Ganoids. 



Megalichthys hibberti 

 Holoptychiiis sauroides 

 Strepsodiis sauroides 

 Acrolepis sp. 

 Platysomiis sp. rare. 

 Acanthodopsis . egertoni 

 Gyrolepis rankinii 

 Palaeoniscus sp. 

 Coelacanthus lepturus 

 Ctenodus ellipticiis 

 Ctenodiis tiiberculatus 



