290 



POL YPTERINI 



Family Coelacanthidae. Coelacanthus, Ag., ; Devonian to Permian, 

 Europe ; Carboniferous, North America. Undina, Miinster (Holophagus, 

 Eg.) (Fig. 259) ; Libys, Miinster ; Coccoderma, Quenst. ; Heptanema, Bell ; 

 Jurassic, Europe. Diplurus, Newb. ; Trias, North America. Macropoma, 

 Ag. (Fig. 261) ; Cretaceous, Europe. 



Division 3. 



Order POLYPTEEINI. 



This Order includes only two genera of living African fish, 

 Poh/ptems and Calamoichthys, of great interest and importance. No 

 fossil representatives of the Order have yet been found, and 



Fig. 263. 



Skeleton of the right half of the pectoral girdle and of the right tin of Potypterus bichir, 

 Geoffr. ; inner view, cl, cleithrum ; eo, cofacoid ; cv, clavicle ; d.c, distal radial cartilage ; 

 /'. dermal rays; l.pc, lower postclavicle ; m, mesopterygial bony plate; m.e, mesopterygial 

 cartilage; mi, metapterygium, or postaxial radial; n.f, nerve-foramen : p.ra, preaxial radial; 

 pst, post-temporal; r, radial; sc, scapula: >•■./, scapular foramen; sd, supraclavicle ; u,.pc, 

 upper postclavicle. 



although Huxley showed some points of resemblance between the 

 Polypterini, the Osteolepidoti, and the Coelacanthini, and united 

 them in the one group Crossopterygidae [227], yet it must be 

 confessed that the living forms remain very isolated, and that their 

 systematic position is still very uncertain. J. Midler [307], Huxley 

 [227], Leydig [282], Traquair [441-2], Allis [13, H], Boulenger [41], 

 Pollard [334], and Bridge [54] have studied the anatomy and 



